3D Supramolecular Structure Research Articles

Tuning Dimensions of Complexes through Selective In Situ Reaction, Mechanistic Insights into Ni(II)-Catalyzed Br-OH Exchange, Magnetic Properties, and Density Functional Theory Studies.

Two coordination polymers (CPs), namely, [Mn3(L)2(4,4'-bipy)2(H2O)2]n (1) and [Ni(L1)(1,4-bib)(H2O)]n (2) (H3L = 5-(3-bromo-4-carboxyphenoxy)isophthalic acid, H2L1 = 5-(3-hydroxyphenoxy)isophthalic acid, 4,4'-bpy = 4,4'-bipyridine, and 1,4-bib = 1,4-bis(1H-imidazol-1-yl)benzene), were synthesized under hydrothermal conditions. Most notably, with the help of the bromine atom-inducing effect, ligand transformation was observed in the structure of complex 2, which was scrutinized thoroughly by single crystal X-ray crystallography and X-ray photoelectron spectroscopy (XPS). Strikingly, Ni(II) ions were utilized as both coordinated atoms and as a catalyst for in situ Br-OH exchange of H3L in the process, as a result of which the product would have preferred to form a one-dimensional chain. The same reaction cannot happen in 1, leading to form a two-dimensional structure. Moreover, Ni(II)-catalyzed and magnetic exchange mechanisms were well interpreted using density functional theory (DFT) calculations. Finally, complexes 1-2 show three-dimensional (3D) supramolecular structures because of intermolecular weak interactions (C-Br···π, C-H···π, C-H···O, and π···π stacking) and exhibit utterly different antiferrimagnetic coupling interactions.

Two luminescent Zn(II) coordination complexes as fluorescence-responsive sensors for efficient detection of Cu2+ ions

A great quantity of materials for the detection of Cu2+ have been reported, but the structural transformation of these materials is difficult to understand during the detection process and hence less reported. Here, two new Zn-based complexes, namely, [Zn2(L)(phen)(H2O)3·2.4H2O]n (1) and {[Zn(2,2′-bpy)(H2O)4][Zn(H2L)2(2,2′-bpy)(H2O)2]·H2O} (2), have been successfully constructed under hydrothermal conditions by using the H4L linker (3,5-di(3,4-dicarboxylphenyl) pyridine), N-auxiliary ligands (phen = 1,10-phenanthroline and 2,2′-bpy = 2,2′-bipyridine), and Zn2+ with d10 electron configuration. X-ray crystallographic analysis suggests that 1 features a 2D layer, which is further extend into a 3D supramolecular structure by hydrogen bonding interactions. 2 displays a 0D ionic structure, which can form 2D framework via hydrogen bonding. Notably, complexes 1 and 2 contain multiple O functional sites that can be used to detect guest metal ions. As expected, photoluminescence studies reveal that complexes 1 and 2 are promising luminescence sensors for selective detection of trace amounts Cu2+ ions in aqueous solutions by luminescence quenching mechanism, featuring high sensitivity, and low detection limits (74.6 nM and 301.7 nM). Complexes 1 and 2 have different sensing mechanisms for Cu2+. The quenching mechanism of complex 2 is rare, that is, the irreversible exchange of metal ions induces crystal structural transformation and the exchange process can be clearly monitored by visual color changes

Iodobismuthate(iii) complex with coordinated triiodide ligand and 3D supramolecular structure

Iodobismuthate complex (1-Me-3-ClPy)3[Bi2I8(I3)] features the presence of coordinated triiodide ligand. The system of I∙∙∙I non-covalent interactions yields in 3D supramolecular structure. This complex reveals high thermal stability (>100 °C) and relatively narrow optical band gap (1.55 eV), and it can be considered as promising candidate for testing as light absorber in photovoltaic devices.

Molecular and Supramolecular Structure of a New Luminescent Hybrid Compound: (C5N2H14)2[BiBr6]Br·H2O

The reaction of homopiperazine, C5N2H12, with BiBr3 in strong hydrobromic acid affords a new organic-inorganic hybrid (C5N2H14)2[BiBr6]Br·H2O. It crystallizes in the orthorhombic space group, Pbca, with unit cell dimensions of a = 15.0775 (2), b = 15.7569 (2), and c = 20.7881 (4) Å, and eight formula units per unit cell. The crystal structure features slightly distorted octahedral BiBr63− and monoatomic Br− anions in the inorganic substructure and C5N2H142+ dications and adjacent water molecules in the organic substructure. Various weak interactions that include (N)H···Br, (N)H···O, and (O)H···Br hydrogen bonds ensure the assembling of the structural moieties into a 3D supramolecular structure. (C5N2H14)2[BiBr6]Br·H2O shows two emission bands in the photoluminescence spectrum, a rather narrow deep-blue PL at 432 nm, and a broadband red PL centered at 650 nm. Their nature and relations to the crystal structure are discussed in this paper.

A comparative study of proton conduction between two new Cd(II) and Co(II) complexes and in vitro antibacterial study of the Cd(II) complex

Two new complexes based on 4,4′‐[1,3‐phenylenebis(oxy)]diphthalic acid (H4L) ligands were synthesized, namely, [Cd2(L)(1,10‐phen)2(H2O)]n(1) and [Co2(L)(1,10‐phen)2(H2O)]n(2), in which 2D structures transform into 3D supramolecular structures by CH···π interaction. The proton conductivity of complexes 1 and 2 at low temperature is close (σ1 = 3.12 × 10−8 S cm−1 and σ2 = 3.81 × 10−8 S cm−1 at 30°C), but these two complexes show different conduction mechanisms. The Vehicular mechanism in 1 is caused by the O···H/H···O contact in 1, which is stronger than 2, and the Grotthuss mechanism in 2 is caused by the N···H/H···N contact in 2, which is stronger than 1. At the same time, complex 1 showed excellent antibacterial properties in vitro, mainly reflected in that five kinds of bacteria (Escherichia coli, Bacillus amyloliquefaciens, Pantoea agglomerans, Pseudomonas putida, and Pectobacterium carotovora) could play an obvious inhibitory effect in the concentration range of 20 μg·ml−1.

Supramolecular and theoretical investigation of copper(II) complexes containing 2,2′-bipyridine and substituted chalcone ligands: Estimation of non-covalent interactions

Copper complexes of type [Cu(L)(bpy)(NO3)] {1, L = L1; 2, L = L2; L1H= 3-(4-benzyloxyphenyl)-1-(2-hydroxylphenyl)-prop-2-en-1-one, L2H= 1-(2-hydroxyphenyl)-3-(4-chlorophenyl) prop-2-en-1-one, bpy=2,2′-bipyridine} have been synthesized and characterized using elemental analysis, spectroscopic (IR, UV–Vis) and single crystal X-ray diffraction techniques. In both complexes, Cu(II) adopts distorted square pyramidal geometry. The crystal packing of complex 1 displays an infinite 1D supramolecular architecture using C–H⋯O and π-π stacking interactions. The C–H⋯O and π⋯π interactions together with weak C–H⋯Cl interaction facilitate formation of a 2D supramolecular net like structure in complex 2. The comprehensive studies of these interactions have been made using hirshfeld surface, fingerprint plots analyses and energy frameworks. The molecular electrostatic potential (MEP) surface analysis shows the larger values of negatively charged nitrate and larger positive values at aromatic ring in both complexes. It implies that C–H⋯O and π⋯π interactions are dominant. Additionally, the combination of non-covalent interaction (NCI) plot index and QTAIM analysis computational tools are used to explore energetic features of the synthons involving different non-covalent interactions such as C–H⋯O, π⋯π and C–H⋯Cl interactions. Both analyses show that the combined π⋯π and CH⋯π interactions are dominant in the complex 1 for the dimer stabilization and construction of supramolecular structure. Whereas, complex 2 dimerization is prominently due to π⋯π interaction. The complexes 1 and 2 display emissions λmax 524 and 533 nm at λexcit 438 and 440 nm, respectively. It indicates small bathochromic shift in emission of complex 2 to complex 1 due to substituted chalcone ligands.

PPh3H]2[SbCl5]: A Zero-Dimensional Hybrid Metal Halide with a Supramolecular Framework and Stable Dual-Band Emission

Zero-dimensional (0D) organic–inorganic metal halides (OIMHs) have attracted tremendous attention due to their fascinating optoelectronic properties. Herein, we report an antimony(III)-based 0D OIMH of [PPh3H]2[SbCl5] comprising discrete [SbCl5]2– pyramids and protonated triphenylphosphine (PPh3H) cations with a low charge density. Abundant supramolecular interactions including C–H···Cl and rare P–H···Cl hydrogen bonds and C–H···Π and anion···Π interactions lead to a three-dimensional (3D) supramolecular framework structure of [PPh3H]2[SbCl5]. Photophysical characterizations indicate that [PPh3H]2[SbCl5] has singlet/triplet dual-band emission. The intersystem crossing between the single and triplet states is tunable upon changing the temperature. Analyses of the Huang–Rhys factor (S), exciton activation energy (Ea), and electron–phonon coupling energy (Γop) verify that the soft lattice and strong electron–phonon coupling result in the broad emission of [PPh3H]2[SbCl5], while the excited-state reorganization of the [SbCl5]2– pyramid leads to a large Stokes shift. DFT calculations help provide a deep understanding on the optical property of [PPh3H]2[SbCl5]. The title compound could remain stable for more than 1 year without the obvious decay of emission, which may be related to the rigid 3D supramolecular framework.

Single crystal investigations, spectral analysis, DFT studies, antioxidants, and molecular docking investigations of novel hexaisothiocyanato chromate complex

We successfully synthesized 3D supramolecular structure of 2-Amino-6-methyl piridinium hexaisothiocyanatochromate (III) complex, (C6H9N2)3 [Cr(SCN)6].H2O. The structure of the synthesized material was confirmed by single crystal X-ray crystallography, UV, FT-IR, photoluminescence, and thermal analysis. A detailed analysis of the intermolecular close interactions and their percentage contribution has been performed based on the Hirshfeld surfaces and their associated two-dimensional fingerprint plots as well as the other quantum chemical descriptors using density functional theory (DFT) computation were occurred in order to insight into the role of weak molecular interactions of the complex that influence the self-assembly process and crystal packing. In this context, the novel complex was characterized by various techniques, the FTIR analysis was registered to revel the vibrational modes of the compound, add to the study of the optical properties using a polar solvent to carry out the UV–visible analysis, and fluorescence to investigate the optical property along with the biological studies by the evaluation of anti-free radical activity. Thermal analyses were performed for this complex to account for the thermal decomposition of complex and to investigate the use of this complex as a single-source precursor for the synthesis of chrome sulfide (CrS) under Argon atmosphere and chrome oxide (CrO) under air. Furthermore, molecular docking was performed on the synthesized complex docked with 4CIA to further understand the biological activities and applications as a potential cardiovascular disease drug candidate. On the other hand, the MESP was intrigued with the stability of the complex that was created between the receptor and the title chemical. According to the mulliken population analysis, the target molecule had an electric potential between -0.221 and 0.221. When compared to the typical medicine, the examined molecule showed extremely strong inhibitory potential in terms of the number of hydrogen bond interactions, according to the results of molecular docking. As a result, the head chemical may be used as a substitute medication candidate for the treatment of cardiovascular disease.

A new cadmium(ii) coordination polymer with 1,4-cyclohexanedicarboxylate acid and phenanthroline derivate: Synthesis and crystal structure

Abstract A new Cd(ii) coordination polymers, formulated as [Cd(1,4-chdc)(L)] n (1) (L = 1-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)naphthalen-2-ol ligands and 1,4-H2chdc = 1,4-cyclohexanedicarboxylate acid), were successfully synthesized by using L ligand and 1,4-H2chdc acid under hydrothermal conditions and characterized by single crystal X-ray elemental analyses, diffraction, and IR spectroscopy. Each Cd(ii) atom is a distorted pentagonal bipyramidal geometry connecting the deprotonated 1,4-chdc anion to form a 2D layer, and a 2D layer is formed into a 3D supramolecular structure by the π–π stacking interactions between neighboring layers.

Multiphysics of multifunctional nanofluids based on different oxides nanoparticles and glycerol fluid

Nanofluid (NF) materials consisting of glycerol (Gly) and different inorganic nano oxides (TiO2, ZnO, Al2O3, and SiO2 for the oxides concentration of 0.01 wt% to the weight of Gly base fluid) were prepared by a two-step method through ultrasonic cavitation process. These nanofluids were investigated by employing an X-ray diffractometer (XRD), ultraviolet–visible (UV–Vis) spectrophotometer, 20 Hz to 1 MHz frequency range dielectric relaxation spectroscopy (DRS), ultrasonic interferometer, and rotational viscometer. The multiphysics of these nanofluids includes structural and optical properties, dielectric permittivity, electrical conductivity, conductivity relaxation, ultrasound velocity, adiabatic compressibility, acoustic impedance, viscosity, density, thermal conductivity, and viscoacoustic relaxation were characterized. The XRD patterns identified monodispersed and stable suspensions of these different characteristic nanoparticles in the hydrogen-bonded 3D supramolecular structure of ultra-high viscous glycerol fluid which were supported by their UV–Vis absorbance analyses. The energy band gap values of the TiO2 and ZnO containing nanofluids were found primarily ruled by the characteristic optical properties of these oxides nanomaterials. The complex dielectric and various electrical functions studied at 25 °C revealed that the suspension of different oxide nanoparticles in the glycerol fluid increased the static permittivity whereas reduced the direct current electrical conductivity which showed strong conductivity relaxation process dependence. The rheological measurements of the formulated nanofluids were performed over a shear rate range of 0.4–40 s−1 at temperatures of 25–55 °C. The linear relationship between shear rate and shear stress and also the shear rate-independent viscosity revealed the Newtonian behaviour of these nanofluids. The shear viscosity non-linearly decreased with the increase of temperature and exhibited the Arrhenius behaviour for all different oxides containing Gly-based nanofluids. The acoustic parameters of the nanofluids were altered unevenly with types of nano oxides and inferred some structure-property correlations. The promising technologically useable properties of these nanofluids were expected to impact their potential applications in optoelectronics, UV-blocking, sensing, nanodielectrics, energy storing and electric insulation, heat transfer systems, and also in materials processing for the development of innovative soft condensed devices.

Multidimensional Energetic Coordination Polymers as Flame Colorants: Intriguing Architecture and Excellent Performance

A flexible and multifunctional 4-hydroxy-3,5-dinitropyrazole (DNPO) ligand was produced while seeking “green” energetic coordination polymers (ECPs). A series of alkali metal and alkaline earth metal ECPs of DNPO were successfully prepared and comprehensively characterized using elemental analysis, infrared spectroscopy, differential scanning calorimetry, and thermogravimetric analysis. All ECPs were characterized via single-crystal X-ray diffraction. They have high crystal densities ranging from 1.743 (ECP-6) to 3.399 g cm–3 (ECP-5). Furthermore, various shapes of zero-dimensional (0D), one-dimensional (1D), two-dimensional (2D), and three-dimensional (3D) supramolecular structures were found for the preparation of ECP, and each metal was combined in a specific and characteristic manner. All the prepared ECPs show excellent thermal stability, and the decomposition temperatures are higher than 347.0 °C (ECP-9) and 418.0 °C (ECP-1), due to the numerous coordination bonds and the network structure of the complex. The sensitivities toward impact and friction were tested using standard methods, and most of ECPs (ECP-1, ECP-2, and ECP-6 to ECP-9) can be considered insensitive to impact and friction, with values higher than 40 J and 360 N, respectively. ECP-3, ECP-4, and ECP-5 are sensitive toward impact (30, 12, and 8 J, respectively), while they are insensitive toward friction (≥360 N). Upon their combustion, these ECPs exhibit a series of unique flame colors, making them promising flame colorants for various ecofriendly pyrotechnic formulations.

High capacity for selective adsorption of anionic pollutants by a silver(I) 3D cationic supramolecular constructed from a flexible dithione ligand

A new cationic 3D-supramolecular coordination polymer namely, {[Ag3(Prbit)2 (CF3SO3)] [PF6]2}n (Ag-SCP) was designed, synthesized, structurally elucidated by X-ray crystallography and converted into the nano-sized particles in order to use it for further applications. In its asymmetric unit, three different AgI centers with three distinguished coordination geometries were detected. The uncoordinated PF6-anions neutralize the positive charge associated with the complex. The structure was extended by the intermolecular hydrogen bonding interactions to form a 3D supramolecular network structure. The ligand has an anti-gauche conformation. The polymer has a substantial potential for adsorption of organic and inorganic pollutants. Furthermore, as a recyclable promising prototype the nano–sized polymer displays a fast, efficient and reversible adsorption of Cr(VI) from the Cr(VI)-containing aqueous solutions. The influence of various factors such as initial concentration of the Cr(VI) ions, weight of the nano-sized Ag-SCP, pH and contact time on the adsorption efficiency of Cr(VI) were examined by the central composite design (CCD) method. Under the optimum conditions and desirable function value of 1.0, the adsorption percentage of Cr(VI) ions was to be 97%. Regression analysis with an R2 value of 0.99 indicates a satisfactory correlation between the obtained and predicted data. By virtue of these benefits, the presented supramolecular exhibits a high capture yield. Additionally, the adsorption of Cr(VI) by the nano Ag– SCP via anion exchange mechanism was dependent on the nature of the cationic network. Furthermore, the adsorbent exhibits a good capacity and selectivity for the adsorption of anionic dyes from the aqueous solutions.

Mechanochemical Synthesis of Phosphonate-Based Proton Conducting Metal-Organic Frameworks.

Water-stable metal-organic frameworks (MOFs) with proton-conducting behavior have attracted great attention as promising materials for proton-exchange membrane fuel cells. Herein, we report the mechanochemical gram-scale synthesis of three new mixed-ligand phosphonate-based MOFs, {Co(H2PhDPA)(4,4'-bipy)(H2O)·2H2O}n (BAM-1), {Fe(H2PhDPA)(4,4'-bipy) (H2O)·2H2O}n (BAM-2), and {Cu(H2PhDPA)(dpe)2(H2O)2·2H2O}n (BAM-3) [where H2PhDPA = phenylene diphosphonate, 4,4'-bipy = 4,4'-bipyridine, and dpe = 1,2-di(4-pyridyl)ethylene]. Single-crystal X-ray diffraction measurements revealed that BAM-1 and BAM-2 are isostructural and possess a three-dimensional (3D) network structure comprising one-dimensional (1D) channels filled with guest water molecules. Instead, BAM-3 displays a 1D network structure extended into a 3D supramolecular structure through hydrogen-bonding and π-π interactions. In all three structures, guest water molecules are interconnected with the uncoordinated acidic hydroxyl groups of the phosphonate moieties and coordinated water molecules by means of extended hydrogen-bonding interactions. BAM-1 and BAM-2 showed a gradual increase in proton conductivity with increasing temperature and reached 4.9 × 10-5 and 4.4 × 10-5 S cm-1 at 90 °C and 98% relative humidity (RH). The highest proton conductivity recorded for BAM-3 was 1.4 × 10-5 S cm-1 at 50 °C and 98% RH. Upon further heating, BAM-3 undergoes dehydration followed by a phase transition to another crystalline form which largely affects its performance. All compounds exhibited a proton hopping (Grotthuss model) mechanism, as suggested by their low activation energy.

Synthesis and crystal structure of one new cadmium coordination polymer constructed by phenanthroline derivate and 1,4-naphthalenedicarboxylic acid

Abstract A cadmium coordination polymer, [Cd(1,4-NDC)(L)] n (1), has been hydrothermally synthesized by using 1-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)naphthalen-2-ol (L) and 1,4-naphthalenedicarboxylic acid (1,4-H2NDC). The complex 1 was characterized by diffraction and elemental analyses. In complex 1, the cadmium ion is distorted octahedral coordinated linking the deprotonated 1,4-NDC anion to form a two-dimensional (2D) layer, and the 2D layer are associated into 3D supramolecular structure via the strong π–π stacking interactions from the conjugated L ligands. In addition, thermogravimetry, powder X-ray diffraction, and the solid-state photoluminescent properties of complex 1 were also studied.

Rational design of three Co(II) coordination polymers based on a semirigid tricarboxylate ligand: Syntheses, structural variability, electrochemical behavior, magnetic and photocatalytic properties

Three novel Co(II) based coordination polymers (CPs) are fabricated using the 5-(2-carboxylphenoxy)isophthalic acid (H3L) and different N-donor configuration under the solvothermal conditions, namely, [Co2(L)(1,4-bibt)(μ3OH)]n (1), [Co(HL)(4,4′-bidpe)]n (2), and [Co(HL)(tib)]n (3) (1,4-bibt = 1,4-bis(imidazol-1-yl)butane, 4,4′-bidpe = 4,4′-bis(imidazolyl)diphenylether, tib = 1,3,5-tris(1-imidazolyl)benzene). The configuration of 1–3 are confirmed by various characterization analysis. The CP 1 possesses an unprecedented (3,10)-connected 3D architecture with a unique tetranuclear [Co4(µ3OH)2(COO)4]2+cluster. Interestingly, when the H3L ligands are not calculated, the whole structure of N-donor still shows a 3-fold interpenetrating dia 3D framework (3D + 3D → 3D). Moreover, CPs 2 and 3 are 3D supramolecular structure with significant differences structures. The CP 2 shows a 2D sql uninodal 4-connected 2D network with the Schläfli symbol (44•62), while CP 3 exhibits an unprecedented 2D framework. And both 2 and 3 construct 3D supramolecular architecture through H-bonds between the two adjacent 2D networks. Comparing CPs 1–3 shows that the N-donor ligands play a key role in adjusting the final structures. Furthermore, the electrochemical behavior, magnetic properties and photocatalytic activity of 1–3 are also discussed in details.

Four new coordination polymers constructed by (3-carboxyl-phenyl)-(4-(2’-carboxyl-phenyl)-benzyl) ether and 2,2'-bipyridine

Coordination polymers have received considerable attention for their fascinating architectures and potential applications. It is well-known that several factors influence the final structures of desired coordination polymers. In this work, four new coordination polymers [Mn(L)(bpy)]·H2O (1), [Co(L)(bpy)]·H2O (2), [Cd(L)(bpy)]·H2O (3), and [Zn(L)(bpy)]·H2O (4) were constructed by (3-carboxyl-phenyl)-(4-(2’-carboxyl-phenyl)-benzyl) ether (H2L) and 2,2’-bipyridine (bpy). Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by IR spectra, elemental analyses, and thermogravimetric analyses. The results exhibit that the structures of compounds 1-3 are essentially isomorphic and display similar ladder-like double-chain structures. The adjacent chains are extended to the 2D supramolecular layer by intermolecular π-π interactions. Compound 4 shows a 0D metallomacrocyclic structure, which can penetrate adjacent metallomacrocyclic to generate a 0D → 1D interdigitated architecture. Furthermore, the interdigitated supramolecular chains are extended to the 2D supramolecular structure by the intermolecular π-π interactions. The results display the π-π interaction plays an important role in the final structures of coordination polymers.

Supramolecular assembly of an Au(III) complex of 2‐(3‐phenyl‐1H‐1,2,4‐triazol‐5‐yl)pyridine: Structure, biological studies and charge transportation

AbstractAn Au(III) complex, [Au(2‐ptp)2]Cl (1) (2‐ptp = 2‐(3‐phenyl‐1H‐1,2,4‐triazol‐5‐yl)pyridine), has been characterized by single‐crystal X‐ray diffraction technique and other spectroscopic data. Presence of different noncovalent interactions leads to the formation of 3D supramolecular structure. The complex 1 exhibits antibacterial activity against Gram‐positive (MIC) (Staphylococcus aureus [240 μg/ml], Bacillus subtilis [645 μg/ml]) and Gram‐negative (Escherichia coli [270 μg/ml], Enterococcus faecalis [820 μg/ml], Klebsiella pneumonia [785 μg/ml]) bacteria. Also, the toxicity of 1 has been checked by MTT assay. The complex shows promising anticancer activity against Vero cells and the CC50 is 405 μg/ml. The complex also shows improved conductivity (Λ) by one order difference on illumination (Λdark, 7.42 × 10−5 Sm−1 and Λillumination, 2.45 × 10−4 Sm−1).

A Drug–Drug Multicomponent Crystal of Metformin and Dobesilate: Crystal Structure Analysis and Hygroscopicity Property

A drug–drug multicomponent crystal consisting of metformin (MET) and dobesilate (DBS) was prospectively connected by solvent cooling and evaporating co-crystallization using the multicomponent crystal strategy, not only to optimize the physicochemical properties of single drugs, but also to play a role in the cooperative effect of DBS with the potential vascular protective effects of MET against diabetic retinopathy (DR). The crystal structure analysis demonstrated that MET and DBS were coupled in a 3D supramolecular structure connected by hydrogen-bonding interactions with a molar ratio of 1:1. Almost all hydrogen bond donors and receptors of MET and DBS participated in the bonding, which hindered the combination of remaining potential hydrogen bond sites and water molecules, resulting in a lower hygroscopicity property than MET alone.

A novel Cd (II) coordination polymer of highly sensitive sensing for antibiotics in aqueous medium

A novel Cd(II) coordination polymer (CP) {[Cd(H2DOBPDC2-)(bpd)]·H2O}n (1) has been synthesized by a rigid polycarboxylic acid with hydroxyl groups (H4DOBPDC = 4,4′- dihydroxy-[1,1′-biphenyl-3,3′-dicarboxylic acid]). Structure analysis displayed that CP 1 shows a 3D supramolecular structure through hydrogen bonding. In addition, fluorescence experiments confirmed 1 can sensitively and selectively detect NFT in aqueous medium with limit of detection of 3.67 × 10-6 M. Meanwhile, the detection mechanism of 1 toward NFT was also investigated by the experiments of PXRD, UV–vis spectrum and fluorescent lifetime and Density Functional Theory (DFT) calculation in detail.

Slow Phase Transition-Induced Scan Rate Dependence of Spin Crossover in a Two-Dimensional Supramolecular Fe(III) Complex

Slow Phase Transition-Induced Scan Rate Dependence of Spin Crossover in a Two-Dimensional Supramolecular Fe(III) Complex