Zero-dimensional Structures Research Articles

Plasma sprayed Titanium- Nanodiamond composite coatings with enhanced mechanical properties

This research aims to investigate the mechanical properties of plasma-sprayed Ti-nanodiamond (Ti-NDs) composite coatings, leveraging the zero-dimensional structure, outstanding mechanical properties, and remarkable chemical and thermal stability of nanodiamonds (NDs) as a prudent choice for enhancing the mechanical properties of Ti coatings. The deposited coatings were tested for their mechanical properties, including Ultimate Tensile Strength (UTS), Yield Strength (YS), Hardness, and Elastic Modulus. The relative density of the coatings experienced a substantial increase with the addition of NDs, from 82.31% to 94.79% for 1wt%. This improved relative density was attributed to the effective melting of powders under the plasma plume facilitated by the presence of NDs having higher thermal conductivity. Consequently, a remarkable improvement of 22.7% in UTS and 20.5% in YS, accompanied by a considerable enhancement in hardness (20%) and elastic modulus (26.7%). These enhancements in the coating properties are credited to the excellent mechanical properties and higher thermal conductivity of NDs, facilitating the uniform melting of the Ti matrix and, consequently, leading to improved density and the formation of TiC within the coatings.

Perylene- and Perylene Diimide-based Framework Materials Constructed through Metal Coordination.

Metal-organic frameworks (MOFs) are a class of materials composed by coordinative interactions between metal ions and organic linkers, encompassing two-dimensional (2D), and three-dimensional (3D) architectures. Metal-organic cages (MOCs), a special case of these species, are discrete molecular "capsules" with zero-dimensional (0D) structures. Over the last two decades, MOFs and MOCs composed of organic perylene (P) and perylene diimide (PDI) linkers have gained much attention due to their versatile properties, which can be further enhanced after incorporation into the frameworks. This minireview highlights recent progress in the construction and application of P/PDI-based coordination framework materials. The text offers an overview of the synthesis of P/PDI organic linkers, proceeds to their integration into coordination frameworks of different dimensionalities - 2D and 3D MOFs, and 0D MOCs, and then explores potential applications. These include sensing, photocatalysis, electrochemical devices as well as photothermal conversion and focus on the apparent structure-property relationships. Finally, the challenges and future prospects of P/PDI-derived coordination frameworks will be addressed.

Unlocking Full-Spectrum Brilliance: Dimensional Regulation in Lead-Free Metal Halides for Superior Photoluminescence.

Lead-free metal halides with tunable structures have emerged as a new class of optoelectronic materials. The arrangement of metal halide polyhedra defines their structural dimensionality and serves as a key factor influencing their optical properties. To investigate this, we synthesized four different antimony (Sb)-doped indium (In)-based metal halides, all of which possess zero-dimensional (0D) electronic structures but exhibit 3D, 2D, 1D, and 0D structural dimensionality at the molecular level. With a decreasing of structural dimensionality, their self-trapped exciton (STE) emission shows a red shift with peak position from 496 to 663 nm. We revealed that the red shift is caused by increased distortion of [SbCl6]3- octahedra as the structural dimensionality decreases, leading to lowered energy levels of STE and a corresponding red shift. The tunable STE emission makes these metal halides promising for anticounterfeiting and white LED applications. These findings provide a new strategy for tuning STE emission in lead-free metal halides.

Crystal structure and optical properties of a new 0D Sb-based hybrid metal halide: (3,5-DMP)3Sb2Br9

Zero-dimensional (0D) lead-free hybrid organic-inorganic metal halides (OIMHs) have recently garnered tremendous attention due to their diversified structures and unique structure-dependent photoluminescent (PL) properties. Herein, we report a novel Sb-based 0D hybrid organic-inorganic metal halide (OIMH), with the chemical formula (3,5-DMP)3Sb2Br9 [3,5-DMP+ = 3,5-dimethyl piperidinium cation, C7H16N+]. The (3,5-DMP)3Sb2Br9 compound crystallizes in the triclinic crystal system (P1‾ space group), possessing a typical zero-dimensional (0D) structure with isolated face-sharing (Sb2Br9)3− bi-octahedral units encased by (3,5-DMP)+ organic cations. The isolated bi-octahedral units are distorted due to the strong stereochemical expression of the 5s2 lone pair on Sb3+ and intermolecular H-bonding between the organic moieties and inorganic clusters. The compound exhibited good thermal and environmental stability and possessed an indirect band gap of 2.92 eV. Upon 390 nm UV light excitation, the compound displayed a broad emission band centred at 555 nm, which was attributed to the self-trapped excitons (STEs) formed due to strong electron-phonon coupling in this compound. This study suggests the possibility of new types of 0D OIMHs by introducing different metal centers and bulky organic cations and provides a reference for the structure-property relationship in these compounds, thus, offering guidance for examining the structural evolution and improving their luminescent properties.

The nitrogen heterocyclic dithione rare earth complexes as a multi-response high-efficiency detection sensor for the detection of Cu2+, Co2+, Cr3+, Fe3+, Bi3+ cations and its magnetic study

In this paper, eight novel rare earth complexes Ln(H3L2)(DMA)3(H2O), (Ln = Sm (1), Tb(2), Dy(3), Gd(4), Ho(5), Tm(6), Er(H3L2)(DMA)2(H2O)2 (7), [(μ3-OH)(μ2OH2)3Eu3(H4/3L1)3]n (8)), have been successfully synthesized by solvothermal method. Herein, H4L1 is 1,4,1′,4′-Tetrahydro-[3,3′]bi[[1,2,4] triazolyl]-5,5′-dithione, H6L2 is 5-((5-thioxo-4,5-dihydro-1H,4′H-[3,3′-bi(1,2,4-triazol)]-5′-yl)thio)-1′,4′- dihydro-1H,5′H-[3,3′-bi(1,2,4-triazole)]-5′-thione which was synthesized through in situ condensation reaction of two H4L1. The complexes 1–7 are mononuclear zero-dimensional structures of SmIII, TbIII, DyIII, GdIII, HoIII, TmIII, and ErIII, respectively, and complex 8 is a trinuclear EuIII coordinational polymer. Complexes 1–8 were characterized by the single-crystal X-ray diffraction, powder XRD, infrared spectroscopy and elemental analysis. The luminescence sensing and basic magnetic properties will be studied further. It was found that complexes 2 and 3 could specifically recognize Cu2+, Fe3+, Co2+, Cr3+, and Bi3+ in DMF solution. In 2, the limit of detection (LOD) are 2.33 × 10–5 M, 1.10 × 10–5 M, 2.14 × 10–5 M, 2.15 × 10–5 M for Cu2+, Fe3+, Co2+, Cr3+, respectively, while in 3, the LOD is 7.98 × 10–6 M for Bi3+. Magnetic studies revealed that 3 and 5 exhibit dominant antiferromagnetic interactions.

Tuning the Optical Absorption Edge of Vacancy-Ordered Double Perovskites through Metal Precursor and Solvent Selection.

Vacancy-ordered double perovskites with the formula A 2 MX 6 (where A is a +1 cation, M is a +4 metal, and X is a halide ion) offer improved ambient stability over other main-group halide AMX 3 perovskites and potentially reduced toxicity compared to those containing lead. These compounds are readily formed through a number of synthetic routes; however, the manner in which the synthetic route affects the resulting structure or optoelectronic properties has not been examined. Here, we investigate the role of distinct precursors and solvents in the formation of the indirect band gap vacancy-ordered double perovskite Cs2TeBr6. While Cs2TeBr6 can be synthesized from TeBr4 or TeO2, we find that synthesis from TeBr4 is more sensitive to solvent selection, requiring a polar solvent to enable the conversion of TeBr4. Synthesis from TeO2 proceeds in all of the organic solvents tested, provided that HBr is added to solubilize TeO2 and enable the formation of [TeBr6]2-. Furthermore, the choice of metal precursor and solvent impacts the product color and optical absorption edge, which we find arises from particle size effects. The emission energy remains unaffected, consistent with the idea that emission in these zero-dimensional structures arises from the isolated [TeBr6]2- octahedra, which undergo dynamic Jahn-Teller distortion rather than band-edge recombination. Our work highlights how even minor changes in synthetic procedures can lead to variability in metrics such as the absorption edge and emission lifetime and sheds light on how the optical properties of these semiconductors can be controlled for light-emitting applications.

Synthesis of carbon dots with tailored heteroatomic structure for achieving ultrahigh effectiveness in persulfate activation

Carbon dots (CDs) are normally feature with zero-dimensional structure, excellent solubility, good biosafety, and exceptional photoelectronic properties, thus, awakening the homogeneous-like photocatalytic potency of CDs in peroxymonosulfate (PMS) activation can afford new idea for water body remediation. Herein, we presented a facile nitrogen and sulfur co-doping strategy for the development of high-performance CDs-based photocatalysts. Through the deep investigation on the structure-activity relationship, we proposed that the incorporated pyridinic N within CDs structure could serve as efficient Lewis basic sites for PMS confinement. Importantly, the co-existence of oxidized sulfur groups and specific nitrogen speciation (pyridine N and pyrrolic N) induced unique “push-pull” effect on the photogenerated carriers within the surface state of S,N co-doped CDs. The unique synergy sites and surface hydrophilic nature conferred the CDs exceptional photocatalytic effectiveness, presenting a remarkable PMS consumption ratio of 7.62 per gram of the CDs photocatalyst within just 20 min. Profited from the improved kinetics of interfacial reactions, the CDs-photocatalyzed oxidation system that consisted largely of sulfate radicals can completely degrade rhodamine B within 12.5 min, and hold great potential in long-term operation without needing to regenerate CDs catalyst.

NANOPARTICLES UNVEILED: A COMPREHENSIVE REVIEW OF CLASSIFICATION, PROPERTIES, SYNTHESIS, AND APPLICATIONS

Nanoparticles, defined as particles with dimensions ranging from 1 to 100 nm, represent a groundbreaking domain of nanotechnology. NPs have immense importance across various scientific disciplines and industries. NPs can be classified into zero-dimensional (0D), one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) structures based on their dimensions. NPs are also classified into carbon, semiconductors, ceramics, polymers, and metal NPs based on their materials. NPs exhibit remarkable physicochemical properties, such as high surface area-to-volume ratios, exceptional thermal conductivity, and catalytic activity, making them crucial in fields such as materials science, medicine, and environmental engineering. Nanoparticles can be synthesized through both top-down approaches, where bulk materials are broken down into smaller particles, and bottom-up methods, involving the assembly of atomic or molecular components. Their applications are diverse and include drug delivery systems, advanced catalysts, nanoelectronics, and environmental remediation technologies, demonstrating their pivotal role in shaping our technological landscape.

New lead-freeIodoantimonatehalide semiconductor: Synthesis, Structural characterization, DFT calculations, Hirshfeld surface, Thermal behavior, vibrational and optical properties

Hybrid metal halides have captured broad interest in the lighting and display fields because of their unique electronic structures and splendid broadband emission properties. Organic chiral building blocks can control light, charge, and spin interconversion in hybrid crystalline semiconductors with metal-halide.Based on the chiral organic molecules(S)-1-phenylethylamine, we synthesized new chiral antimony halidewith zero-dimensional structure((S)-C8H12N)4Sb2I10. Atroom temperature, the title compound is crystallized in the monoclinic P21with Z = 2 and the following unit cell dimensions: a = 12.69129 (15) Å, b = 14.96770 (15) Å, c = 13.91397 (16) Å, and β = 92.2735 (11)°.The crystal structure of this compound is composed of two crystallographically independent [Sb2I10]4- unit and four (S)-1-phenylethylammonium per unit cell. The crystal packing is governed by NH....I hydrogen bonds.Intermolecular interactions seen in the grown single crystal are studied by Hirshfeld surface and 2-D fingerprint plot.In addition to study the weak interaction a visualized approach known as RDG has been carried out.The recorded infrared IR and Raman studies confirm vibrational modes for organic and inorganic groups at room temperature in the 500–4000 cm−1 and 50–4000 cm−1 frequency regions, respectively.The optimized molecular structure and vibrational frequencies were calculated by the Density Functional Theory (DFT) method using the B3LYP level employing a LANL2DZbasis set.The title compound reveals thermal stability up to 190 °C.The opticalabsorption measurement confirms the semiconductor nature with a band gap of around 3.74 eV. The frontier molecular orbital analysis HOMO-LUMOof molecule were studied.

Three dimensional noble metal-metal organic framework composite as SERS substrate for efficient capture and detection of pesticides

Hybrids of noble metal and metal-organic framework (MOF) are promising substrates for molecule sensing by surface enhanced Raman scattering (SERS) technique. However, most of these composite SERS substrates are zero-dimensional (0D) or two-dimensional (2D) structures, limiting their efficiency in adsorption and Raman enhancement. In this work, a new three-dimensional (3D) SERS substrate CC/ZnO-Ag@ZIF-8 composed of carbon cloth (CC) supported ZnO nanorod array decorated with AgNPs and coated with ZIF-8 layer was prepared for sensitive detection of pesticide. Compared with common 0D/2D substrates, the synergy of ZnO, AgNPs and MOF in 3D space achieved the highly efficient utilization of each component’s advantages, greatly enhancing the adsorption capacity to analyte and significantly amplifying the EM enhancement effect. Consequently, the 3D SERS substrate showed high SERS sensitivity to pesticide intermediate 4-ATP with a detection of limit (LOD) as low as 10−10 M, which is 3 orders of magnitude lower than its 2D counterpart CC/Ag@ZIF-8, or 2 orders of magnitude lower than that of CC/ZnO-Ag without MOF coating. Additionally, ZIF-8 coating also improves the stability, anti-interference ability and signal consistency of the substrate. Finally, the 3D CC/ZnO-Ag@ZIF-8 was successfully applied to the quantitative analysis of pesticide thiram in real lake water sample, which achieved a linear range of 10−5 to 10−9 M and a LOD of 1 nM. Such 3D noble metal-MOF hybrid SERS substrate with multiple merits in adsorption, Raman enhancement, stability and reproducibility holds great promise in environmental analysis.

Low-dimensional hybrid copper(I) halides single crystals: synthesis, structures, and tunable photoluminescence

Low-dimensional organic–inorganic hybrid copper(I) compounds have attracted much attention due to their high luminescence efficiency and non-toxicity. In this study, we synthesized three novel centimeter-scale Cu(I)-based hybrid [1,2-PDA]CuX3 (X=Cl, Br, I) single crystals using the solvent evaporation method. [1,2-PDA]CuCl3 and [1,2-PDA]CuBr3 exhibit zero-dimensional crystal structures composed of separated binary edge-sharing [CuX4]3- (X=Cl, Br) tetrahedra, while [1,2-PDA]CuI3 exhibits a one-dimensional crystal structure composed of chains of corner-sharing [CuI4]3- tetrahedra. The photoluminescence emission of [1,2-PDA]CuX3 (X=I, Cl, Br) ranges from cyan to purple light at room temperature, showing a tunable pattern with the halogen changes. The photoluminescence quantum yield of the [1,2-PDA]CuI3 single crystal was measured to be 33.5 %. Density functional theory calculations demonstrate that all three single crystals have direct bandgaps. The emission mechanisms of [1,2-PDA]CuI3 single crystals were investigated by temperature-dependent photoluminescence spectroscopy, and the broadband emissions were found to be typical of self-trapped exciton emission. It is worth mentioning that the discovery of low toxic, stable, and inexpensive copper(I) compounds paves the way for considering low-cost and environmentally friendly copper halides for practical applications.

Gradual Increase in Birefringence of Antimony Oxalates through Precise Tuning of the Sb3+/[C2O4]2- Ratio.

Birefringent crystals play a crucial role in modulating and controlling the polarization of light in the optical communication and laser industries. Recently, adopting appropriate strategies to enhance the birefringence of crystals has become a prominent area of research focus. Herein, four UV antimony oxalate birefringent crystals, namely, K5Sb2(C2O4)5.5·3H2O, BaSb(C2O4)2.5·3H2O, Na4Sb2O(C2O4)4·6H2O, and Na3Sb(C2O4)2F2·2H2O, have been successfully synthesized. These compounds feature a similar zero-dimensional (0D) cluster structure and share the same functional groups, including π-conjugated [C2O4]2- groups and Sb3+-based distorted polyhedra with stereochemically active lone pairs (SCALPs). Interestingly, we achieved a stepwise increase in birefringence by precisely controlling the Sb3+/[C2O4]2- ratio, ultimately resulting in the compound Na3Sb(C2O4)2F2·2H2O exhibiting a large birefringence (0.21@546 nm). Additionally, we confirmed that the synergistic effects between the π-conjugated [C2O4]2- groups and the distorted polyhedra based on Sb3+ are responsible for the excellent optical properties observed in the reported compounds.

0D/2D Co-Doping Network Enhancing Thermal Conductivity of Radiative Cooling Film for Electronic Device Thermal Management.

The radiative cooling has great potential for electronic device cooling without requiring any energy consumption. However, a low thermal conductivity of most radiative cooling materials limits their application. Herein, a multishape codoping strategy was proposed to achieve collaborative enhancement of thermal conductivity and radiative properties. The hBN-coated hollow SiO2 particles were prepared based on electrostatic self-assembly technology, which were then mixed with hBN platelets and doped into a poly(vinylidene fluoride-co-hexafluoropropylene) substrate. Discrete dipole approximation theory was employed to reveal the mechanism and optimize the particle size. The results showed that the multishape codoping method can significantly improve the radiative performance, with 94.9% reflectivity and 91.2% emissivity. In addition, this zero-dimensional and two-dimensional composite doping structure facilitated the formation of a thermal conduction network, which enhanced the thermal conductivity of the film up to 1.32 W m-1 K-1. The high thermal conductivity radiative cooling film can decrease the heater temperature from 58.8 to 31.3 °C, with a further reduction of temperature by 7.2 °C compared to the radiative cooling substrates with low thermal conductivity. The net cooling power of the film can reach 102.5 W m-2 under direct sunlight. This work provides a novel strategy for high-efficiency electronic device cooling.

Structural regulation and photophysical insights into zero-dimensional organic copper(I) halides with thiophene-substituted phosphonium cation

Here we report three zero-dimensional (0-D) copper cluster structures, (2-TTPS)[CuCl2] (1), (2-TTPS)2[Cu4Br6] (2), and (2-TTPS)4[Cu4I8] (3), formed by self-assembly of the 2-TTPSX ligand (2-TTPSX = triphenyl(thiophen-2-yl)phosphonium chloride/bromide/iodide) with neutral CuCl/CuBr/CuI, respectively. The CuX salts exhibit a propensity to form high nuclearity aggregates or clusters, leading to a specific structural richness. In 1, two [CuCl2]− units are staggered along the c-axis. In 2, the larger [Cu4Br6]2− inorganic unit is completely encapsulated by 2-TTPS+ cations, with each Cu+ located at the center of a [CuBr4]3− tetrahedral structure. The copper cluster in 3 is characterized by an unprecedented, centrosymmetric tetramer formation. The variation in copper cluster types is achieved through the control of a single crystal growth technique using different CuX salts for assembly. This work introduces the synthetic methods, crystallographic features, and optical properties of the three materials.

Syntheses and properties of seven 3,4-dichlorobenzoate-based zinc-rare earth heterometallic complexes containing a field-induced Zn(II)-Dy(III)-Dy(III)-Zn(II) single-molecule magnet

Under solvothermal conditions of CH3CH2OH and H2O, a series of 3d-4f heterometallic complexes [Ln2Zn2(3,4-DCB)10(2,2′-bpy)2] [Ln = Sm (1), Eu (2), Gd (3), Tb (4), Dy (5), Er (6) and Yb (7), 3,4-DCB = 3,4-dichlorobenzoic acid, 2,2′-bpy = 2,2′-bipyridine] were synthesized by the reactions of Ln(NO3)3·6H2O, Zn(NO3)2·6H2O, 3,4-HDCB, 2,2′-bpy and NaOH. These complexes were characterized by single crystal X-ray diffraction, powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA) and differential thermo analysis (DTA). Complexes 1–7 show two types of different zero-dimensional (0D) structures although they have the same molecular formula. Complexes 1–5 are isomorphic, and complexes 6 and 7 are isomorphic. In 1–7, linear tetranuclear clusters are formed from 3,4-DCB connecting Ln(III) and Zn(II). They can be expanded into one-dimensional (1D) supramolecular chains or two-dimensional (2D) supramolecular layers by the intermolecular π–π interactions. The photoluminescent properties of 1, 2, 4 and 5 and the magnetic properties of 3–7 were studied in detail. Complex 5 exhibits an obvious field-induced single-molecule magnet behavior with a Ueff value of approximately 24 K.

Crystal Structure and Spectroscopic Characterization of a New Hybrid Compound, (C12H17N2)2[CdBr4], for Energy Storage Applications.

Organic-inorganic hybrid materials have recently found a vast variety of applications in the fields of energy storage and microelectronics due to their outstanding electric and dielectric characteristics, including high dielectric constant, low conductivity, and low dielectric loss. However, despite the promising properties of these materials, there remains a need to explore novel compounds with improved performance for practical applications. In this research paper, the focus is on addressing this scientific challenge by synthesizing and characterizing the new-centrosymmetric (C12H17N2)2[CdBr4] crystal. This compound offers potential advancements in energy storage technologies and microelectronics due to its unique structural and electronic properties. The chemical mentioned above crystallizes in the monoclinic system, and its protonated amine (C12H17N2)+ and isolated anion [CdBr4]2- are bound by C-H···π and N-H···Br hydrogen bonds to form its zero-dimensional structure. Through optical absorption analysis, the semiconductor nature of the material is verified, showcasing a band gap of around 2.9 eV. Furthermore, an in-depth examination of Nyquist plots reveals the material's electrical characteristics' sensitivity to frequency and temperature variations. By applying Jonscher's power law to analyze ac conductivity plots, it is observed that the variation in the exponent "s" accurately characterizes the conduction mechanism, aligning with CBH models. The compound exhibits low dielectric loss values and a high permittivity value (ε ∼ 105), making it a promising candidate for energy storage applications. By managing the scientific challenge of improving material performance for energy storage and microelectronics, this research contributes to advancing the field and opens avenues for further exploration and application of organic-inorganic hybrid materials.

Directional regulation of low-dimensional metal complexes by end-sealed ligands: Butterfly effect of structure

In this work, the relationship between structure and properties of several low-dimensional metal complexes was studied, and an interesting "butterfly effect" was found. Four different low-dimensional metal complexes were precisely constructed using different end-sealing ligands, under the constraint of double end-sealing ligands. Complex-1 [Cd(L1)(L3)], complex-2 [Zn(L1)(L4)] and complex-3 [Cd(L2)(L3)] all formed similar zero-dimensional structures, but complex-4 [Zn(L2)] with single end-sealing ligands formed a one-dimensional structure. Four kinds of metal complexes were tested for fluorescence recognition, and it was found that they all had excellent ion recognition ability. Interestingly, complexes-1−3 with similar structures seek qualitative differences while retaining similarities and complex-4 showed a different property. These differences and similarities in properties vividly reflect the high sensitivity of properties to structures for low-dimensional metal complexes with simple structures. In conclusion, this work not only provided a novel feasible method for the custom synthesis of low-dimensional metal complexes, but also found that the properties of low-dimensional metal complexes are sensitive to structural features.

Synthesis, structure, fluorescence, and magnetic studies of a series of transition metal complexes with oxygen-bridged phenylene tricarboxylic acid ligand

In this work, 4-(2-carboxyphenoxy)phthalic acid ligand (H3bppa), 4,4′-dipyridyl (4,4′-dipy), 1,10-phenanthroline (phen), 2,2′-dipyridyl (2,2′-dipy) and transition metal ions Zn2+, Cu2+, Mn2+, Ni2+, Co2+ were used to synthesize metal complexes by solvothermal reaction. Ten complexes were synthesized, namely, [Zn(H2bppa)2(H2O)4]·4H2O (1), [Mn(H2bppa)2(H2O)4]·4H2O (2), [Co(H2bppa)2(H2O)4]·4H2O (3), [Mn(H2bppa)2 (2,2′-dipy) (H2O)]n (4), [Cu(H2bppa)2 (2,2′-dipy) (H2O)]n (5), [Mn3(bppa)2(4,4′-dipy)2 (H2O)6]n (6), [Co(Hbppa) (phen)2 (H2O)] (7) and [Ni(Hbppa) (phen)2 (H2O)] (8), [Mn(Hbppa) (phen) (H2O)]n (9), [Cu(Hbppa) (phen) (H2O)]n (10). Structural datas were collected by X-ray single crystal diffractometer, the results show that complexes 1, 2, 3, 7 and 8 are zero-dimensional mononuclear structure, 4, 5, 9 and 10 are one-dimensional chain structure, 6 is three-dimensional network structure. Furthermore, solid state fluorescence properties were performed on complexes H3bppa and 1–8, magnetic properties were performed on complexes 2–8. The fluorescence experiment results show that the fluorescence intensity of complexes 1–8 is weaker than that of H3bppa, and the fluorescence emission spectrum of complex 1 undergoes a blue shift relative to the H3bppa. Magnetic testing data analysis shows that complexes 2, 3 and 8 have antiferromagentic properties and complexes 4, 5, 6 and 7 have ferromagentic properties.

High External Quantum Efficiency and Dual-Band Emission of (C7H18N)3Sb2Cl9 for Sensitivity Temperature Sensing.

Organic-inorganic hybrid halides have gained attention for their ease of processing and remarkable optoelectronic properties. However, the relationship between the structure and optical properties requires further exploration. In this study, the butyltrimethylammonium cation (C7H18N+) was chosen, and seven compounds were synthesized: (C7H18N)3Sb2X9 (X = Cl, Br), (C7H18N)3Bi2X9 (X = Cl, Br, I), and (C7H18N)(C2H8N)MBr5 (M = Sb, Bi). Crystals with a single organic cation exhibit a zero-dimensional structure, while the introduction of dimethylamine ions increases the crystal dimensionality from zero-dimensional (C7H18N)3Sb2Br9 to one-dimensional (C7H18N)(C2H8N)SbBr5. Under 372 nm excitation, (C7H18N)3Sb2Cl9 showed broad orange-red single-band emission with a high photoluminescence quantum yield of 88.4% and an external quantum efficiency of up to 56.9%. A white light-emitting diode based on (C7H18N)3Sb2Cl9 achieved a high color rendering index of 96.3. Moreover, dual-band emission was observed in (C7H18N)3Sb2Cl9 under 308 nm excitation, which exhibits an absolute temperature sensitivity of 1.96 × 10-3 K-1 (320 K), and a flexible film was prepared by incorporating polydimethylsiloxane. This shows the promise of hybrid metal halides as photoluminescent materials and their possibilities for temperature sensing.

Synthesis, structure, and luminescence properties of a 0D organic-inorganic cadmium iodide: Combined experimental and theoretical approach

Hybrid organic-inorganic metal halide materials with zero-dimensional (0D) structures have emerged as a captivating field of research due to their distinctive electronic properties and remarkable broadband emission characteristics. In this study, we successfully synthesized a novel hybrid cadmium iodide compound, (BZA)2CdI4.H2O (BZA+: benzylammonium), in the form of single crystals employing the solvent-evaporation method. The room temperature single-crystal X-ray diffraction analysis revealed that (BZA)2CdI4.H2O possesses a typical 0D crystal structure, where (CdI4)2− anions are spatially isolated and surrounded by (BZA)+ cations and H2O molecules. The crystal packing is intricately governed by various non-covalent intermolecular interactions, including π–π stacking interactions, NH…I, NH…O, and OH…I hydrogen bonds, quantified through Hirshfeld surface analysis. Thermal analysis further demonstrated that the removal of water molecules in the crystal lattice yields a dehydrated phase of (BZA)2(CdI4). Upon 330 nm irradiation, the title compound displayed a broad bluish-white light emission, featuring a primary band at 430 nm and a secondary band at 500 nm. Based on photoluminescence spectra measurements and density functional theory (DFT) calculations, the dual-band emission is assigned to the emission of (BZA)+ organic cations and to excitons confined in the [CdI4]2– isolated inorganic tetrahedron, respectively. Interestingly, the presence of isolated molecular units in the 0-D structure results in strongly localized charges and bluish-white light emission with Commission International de l'Eclairage (CIE) colour coordinates (0.23, 0.28). These results confirm the promise of 0D metal-halide hybrids with dual-band emission as luminescent materials for solid-state lighting.