Spectral-luminescent Properties Research Articles

Synthesis and Design of Metalloporphyrin Oligomers with Temperature-Assisted Spectral-Luminescent Properties

Synthesis and Design of Metalloporphyrin Oligomers with Temperature-Assisted Spectral-Luminescent Properties

Synthesis and Study of the Optical and Spectral-Luminescent Properties of LuAG:Ce Ceramic

Synthesis and Study of the Optical and Spectral-Luminescent Properties of LuAG:Ce Ceramic

4,7-(bis(octyloxy)-3-(quinoline-2-ylmethylene)isoindoline-1-one and its boronflouride complex. synthesis and spectral-luminescent properties

4,7-Bis(octyloxy)isoindoline-1,3-dione was obtained by reacting 3,6-bis(octyloxy)phthalonitrile with sodium butoxide in butanol, followed by treatment with hydrochloric acid. Its condensation with quinaldine in the presence of zinc oxide leads to the formation of ( E , Z )-4,7-bis(octyloxy)-3-(quinolin-2-ylmethylene)isoindolin-1-one, which was treated with BF3۰Et2O in the presence of triethylamine in toluene to give a new unsymmetrical analogue of BODIPY - ( Z )-2-(difluoroboryl)-4,7-bis(octyloxy)-3-(quinolin-2-ylmethylene)isoindolin-1-one. The complex exhibits a Stokes shift of 25 nm and a high relative fluorescence quantum yield (0.68). To support the experimental data, DFT and TD-DFT calculations were performed.

Spectral-luminescence, redox and photochemical properties of AlIII, GaIII and InIII complexes formed by peripherally chlorinated phthalocyanines and tetrapyrazinoporphyrazines

Complexes of Al[Formula: see text], Ga[Formula: see text] and In[Formula: see text] with peripherally chlorinated phthalocyanine (Cl8PcM) and tetrapyrazinoporphyrazine (Cl8TPyzM) were prepared and studied using spectral and electrochemical methods. DFT calculations were used to reveal the peculiarities of their molecular and electronic structure. Peripheral chlorination of phthalocyanine complexes increases their electron affinity and the first reduction of [Cl8PcM] is observed at −0.25 – −0.35 V (by 0.2 – 0.3 V easier than for [PcM]). Additional azasubstitution further increases the acceptor properties of the macrocycle and [Cl8TPyzM] are reduced at −0.16 V. Among [Cl8PcM] only the Ga[Formula: see text] complex is stable to photooxidation, while among [Cl8TPyzPzM] it is the only one undergoing photoreduction. Fluorescence quantum yields ([Formula: see text] and lifetimes ([Formula: see text] as well as the ability to generate singlet oxygen ([Formula: see text] were determined. The [Formula: see text] values show typical dependence on the central metal Al > Ga >> In and are decreased upon the introduction of chlorine atoms in the peripheral and especially in the axial position. At the same time, azasubstitution in the benzene ring has a minor influence on the [Formula: see text] values but strongly shortens [Formula: see text] (from ca 6 to ca 2 ns). The Ga[Formula: see text] complexes have the highest ability to generate 1O2 and can be considered as effective photosensitizers, especially [Cl8TPyzPzGa(OH)] ([Formula: see text] = 0.87 in slightly acidified solution). Spectral properties in a strongly acid medium were also studied and it was observed that [Cl8PcM] are consequently protonated on meso-nitrogens.

Erratum to: Synthesis, Spectral-Luminescent, and Ionochromic Properties of a Rhodamine B Derivative Containing a Terminal (4-Hydroxybenzyl)triphenylphosphonium Chloride Substituent

Erratum to: Synthesis, Spectral-Luminescent, and Ionochromic Properties of a Rhodamine B Derivative Containing a Terminal (4-Hydroxybenzyl)triphenylphosphonium Chloride Substituent

Design and spectral-luminescent properties of a triad consisting of two BODIPY chromophores axially bound to a Sn(IV)-porphyrin in aqueous and aqueous micellar media

In this work, we designed and studied the emissive properties of a triad consisting of two BODIPY chromophores axially bound to a Sn(IV)-porphyrin via a methylphenolate bridge in aqueous and aqueous micellar media. It has been shown that the fluorescent properties of the porphyrin fragment of the triad, due to photoinduced energy transfer from the axial fragments to the macrocycle, are most sensitive to small changes in viscosity in the range from 3 to 6 cP, which corresponds to the viscosity of the blood of a healthy person (4–6 cP). The localization of the triad in the spherical CTAB micelles increases its emission in aqueous media. The structure–property dependencies established in the study can be applied to design molecular devices for sensing local viscosity of aqueous and aqueous micellar media, which could be of great interest for non-contact detection of physical properties of intracellular or lymphatic fluids.

Synthesis and aggregation-induced emission of (<i>z</i>)-6-alkylamino-2-amino-4-(2-aryl-1-cyanovinyl)pyridine-3,5-dicarbonitriles

( Z )-6-alkylamino-2-Amino-4-(2-aryl-1-cyanovinyl)pyridine-3,5-dicarbonitriles were obtained by reaction of ( Z )-2-amino-4-(2-aryl-1-cyanovinyl)-6-chloropyridine-3,5-dicarbonitriles with various amines, including biologically active ones. The study of the spectral-luminescent properties showed the solid state fluorescence with a maxima at 472-562 nm and its absence in solutions. An increase in the volume fraction of water in solutions above a certain level caused the appearance of fluorescence due to the formation of aggregates. The enhancement of fluorescence upon addition of the viscous solvent glycerol confirmed the presence of aggregation-induced emission of the synthesized compounds.

SYNTHESIS AND STUDY OF THE OPTICAL AND SPECTRAL-LUMINESCENT PROPERTIES OF LuAG:Ce CERAMICS

In this study, LuAG:Ce ceramic powders with compositions of Lu2.98Ce0.02Al5O12 and Lu2.93Ce0.07Al5O12 were synthesized using chemical precipitation. Luminescent ceramic samples were then produced from these powders by vacuum sintering green bodies in the temperature range of 1600 – 1800 ?C. The study aimed to investigate the effect of cerium concentration and vacuum sintering temperature on the optical properties of LuAG:Ce ceramics. The spectral luminescence properties of the LuAG:Ce ceramic samples were analyzed. Results showed that the luminescence intensity was dependent on the activator concentration and vacuum sintering temperature. Additionally, a shift in the maxima of the luminescence spectral bands of the LuAG:Ce ceramics was observed when varying the vacuum sintering temperature within the 1600 – 1800 ?C range.

INFLUENCE OF CERIUM CONCENTRATION AND SINTERING ATMOSPHERE ON THE PHASE COMPOSITION AND LUMINESCENT PROPERTIES OF Y2.98-хCeхAl5.02О12 CERAMICS

The phase composition and spectral-luminescent properties of ceramic samples obtained from oxide compositions with the general formula Y2.98-хCeхAl5.02О12 (x = 0.05, 0.10, 0.20, 0.30, 0.45, 0.60 formula units (f.u.)) were investigated. It was found that the phase composition of the ceramic powders depended significantly on the concentration of cerium and the calcination atmosphere. The maximum concentration of cerium cations in the garnet lattice was determined to be approximately 0.1 f.u. when calcined in air, and approximately 0.16 f.u. when calcined in the argon – hydrogen atmosphere. The photoluminescence of the ceramic samples was studied when excited by a laser with a wavelength of 445 nm. It was observed that ceramic samples sintered in argon and hydrogen had a higher luminescence intensity compared to samples synthesized in a vacuum. The possibility of shifting the wavelength of the maximum luminescence intensity from 546 nm to 570 nm by changing the cationic composition and sintering conditions of the ceramics was demonstrated. Additionally, the negative effect of oxidative annealing of ceramic samples on the intensity and position of luminescence maxima in Y2.98-хCeхAl5.02О12 oxide compositions heavily doped with cerium was shown.

Fabrication and optical properties of YSAG:Cr optical ceramics

YSAG:Cr3+ optical ceramics with compositions Y2.8Sc1.2Cr0.005Al3.995O12, and Y2,88Сr0,005Sc0.2Al4,915O12 were fabricated for the first time. The linear transmittances of the ceramic samples exceeded 80% in the visible and IR regions. It was observed that as the concentration of scandium in YSAG:Cr3+ solid solutions increased, the refractive index of ceramics at a wavelength of 632.8 nm increased from 1.828 ± 0.005 to 1.857 ± 0.005. The effect of scandium cations on the spectral-luminescent properties of Cr3+ cations in the crystal lattice of yttrium-scandium-aluminum garnet was also investigated. It was demonstrated that as the scandium content in dodecahedral site increased from 4 to 50 at%, the effective lifetime of excited states of Cr3+ cations increased from 1.71 ms to 2.72 ms. On the contrary, as scandium content in octahedral site increased, the effective lifetime of excited states of Cr3+ cations decreased from 1.71 ms to 0.71 ms.

Phosphorescence of hexachlorosubstituted subphthalocyanine and its pyrazine analogue

Spectral luminescence, kinetic and energetic properties of hexachlorosubphthalocyaninatoboron(III) chloride and its azaanalogue containing fused pyrazine fragments instead of benzene rings were studied at 298 and 77 K. Weak phosphorescence of complexes was detected and characterized in near-infrared region of spectrum, its parameters depend substantially on the presence of methyl iodide due to its external effect of heavy atom in solutions. Quantum yields of photosensitized formation of singlet oxygen were determined by the relative luminescence method.

Spectral Luminescent Properties and Nature of Electronically Excited States of Sulfaguanidine in Water

Spectral Luminescent Properties and Nature of Electronically Excited States of Sulfaguanidine in Water

MODIFICATION OF GLAZE FOR LUMINESCENCE ART

In this work, the glazed ceramic doped with Ho3+ ions were introduced to understand luminescence artwork. The glaze samples were seperated to three conditions consist of raw glaze material (GR), glaze mixing with Ho2O3 before melting (GHo), and glaze mixing with Ho2O3 after melting (GHoM). The samples were analyzed by X-ray fluorescence (XRF), X-ray diffractometry (XRD), scanning electron microscopy (SEM), optical and luminescence spectral properties. The absorption spectra in the visible and near-infrared region were being identified at 361, 419, 453, 486, 539, 646, 900, 1,157, and 1,963 nm. For luminescence spectra, the result showed a strong emission peak at 543 nm via 5F4-5I8 transition of Ho3+ under excitation at 398 nm. Moreover, the SEM images revealed homogeneous dispersion of glazed sample with Ho3+ ions. The glazed ceramic containing Ho3+ ions can be considered as luminescence artwork for ceramic materials.

Influence of silver nanoparticles in the ion-exchange layer of photo-thermo-refractive porous glass on the spectral-luminescent properties of CsPbBr3 perovskite nanocrystals

The spectral-luminescent properties of new composite materials based on porous matrices of photo-thermo-refractive glasses with a silver ion-exchange layer and CsPbBr3 inorganic perovskite nanocrystals have been studied. Perovskite nanocrystals were introduced into a porous matrix by the method of pumping solutions through a sample under piston pressure. Two mechanisms of interaction between silver nanoparticles and perovskite nanocrystals have been revealed, such as enhancement of the local field and luminescence quenching due to the high absorption of nanoparticles. The quantum yield of the studied samples under different irradiation associated with an increase in the concentration of silver nanoparticles was 34% without irradiation, 51% with 100 j irradiation dose, and 25% with 1000 j irradiation dose. In this case, an increase in the integrated luminescence intensity was observed in glasses irradiated with 100 J by a factor of 2.97 and irradiated with 1000 J by a factor of 1.76 compared to the unirradiated sample. The average luminescence lifetime decreases from 2.19 to 1.68 ns with an increase in the concentration of nanoparticles.

A Joint Study of Experimental and Computational Chemistry to Probe the Effect of Coordination Modes on the Luminescence of Uranyl‐Organic Coordination Polymers

AbstractDespite the potential application of uranyl‐organic coordination polymers (UOCPs) in detecting metal cations and radiation rays, their luminescence properties have not been sufficiently studied at the molecular level. Herein, we synthesized a series of UOCPs (UOCP1–9) with new construction based on bipyridinium salts and diverse auxiliary ligands. The physicochemical properties of the complexes with high purity were systematically characterized, especially the luminescence spectra. A deep theoretical investigation was conducted to illustrate the relation between uranyl coordination and the luminescence spectral property. The results show that the influence of ligand type on the uranyl luminescent spectral properties increases in the order of hydroxide>oxalate>aromatic carboxylate, which can be attributed to the magnitude of orbital interaction between uranyl and ligand. This work helps to profoundly understand uranyl optical properties and electronic structure at the molecular level, providing important hints for recognizing the nature of luminescent spectral features of uranyl‐containing materials, as well as the fundamental chemistry of actinide elements.

Synthesis, spectral-luminescent and ionochromic properties of rhodamine B containing terminal (4-hydroxybenzyl)triphenylphosphonium chloride substituent

A rhodamine B derivative containing a terminal (4-hydroxybenzyl)triphenylphosphonium chloride substituent was synthesized. Its structure was determined using IR, 1H NMR and 13C spectroscopy. The spectral luminescent properties and complexation of the compound obtained in solutions with Co2+, Cu2+, Ni2+ and Zn2+ cations were studied. These ions cause a contrasting ionochromic naked-eye effect with the change of colorless solution to crimson-red color due to the isomerization of the spirolactam form of rhodamine into an open form. The process is accompanied by the appearance of fluorescence in the region of 560-600 nm. The complex with zinc(II) cation exhibits particularly intensive emission, which gives the obtained rhodamine the properties of a highly sensitive and effective chemosensor for Zn2+ ions.

Synthesis, Spectral-Luminescent, and Ionochromic Properties of a Rhodamine B Derivative Containing a Terminal (4-Hydroxybenzyl)triphenylphosphonium Chloride Substituent

Synthesis, Spectral-Luminescent, and Ionochromic Properties of a Rhodamine B Derivative Containing a Terminal (4-Hydroxybenzyl)triphenylphosphonium Chloride Substituent

New bioengineering approaches for immunotherapy

New approaches for immunotherapy based on nanodiamond particles have been developed. The possible ways of conjugate synthesis comprising antibody as targeting vector, nanodiamond particles as carrier, chlorine e6 as photosensitizer, have been demonstrated. Spectral-luminescent properties of the conjugates have been studied. It has been shown that the conjugate obtained effectively binds to cells in vitro. It was observed that chlorine e6 immobilized on ND particles reveals its photodynamic activity under illumination and induces death of cells. Based on obtained results, possible advanced therapeutic strategies for novel medicine technologies have been proposed

Formation of molecular clusters of silver by polymer-salt method in porous glasses

A methodology for the formation of molecular clusters of silver in silicate nanoporous glasses has been developed. Composite materials containing molecular clusters of silver, silver nanoparticles and zinc oxide have been synthesized. The synthesis was carried out by impregnation of porous glasses in aqueous solutions of silver and zinc nitrates stabilized with high-molecular polyvinylpyrrolidone, followed by heat treatment of samples for decomposition of metal nitrates and polymer. Spectral-luminescent properties of composites have been investigated. Keywords: porous glass, zinc oxide, silver molecular clusters, silver nanoparticles, spectral-luminescent properties.

Silicon(IV) complexes of octaaryl-substituted porphyrazines and corrolazines: influence of macrocycle contraction on spectral-luminescence, acid-base, and redox properties.

The template cyclomerization of the iminoimide derivatives (obtained by the treatment of diarylfumarodinitriles with NH3 in methanol containing catalytic amounts of dissolved Na) in the presence of SiCl4 in pyridine leads to silicon(IV) octaarylporphyrazine complexes ((HO)2SiPzAr8, Ar = Ph, tBuPh) as a main reaction product. In the case of phenyl-substituted derivative, the formation of a distinctive Si(IV) complex as a byproduct was observed, which according to mass-spectroscopy measurement contains the macrocycle with five diphenylpyrrolic units. The treatment of bishydroxy complexes with tripropylchlorosilane in the presence of magnesium in pyridine leads to the formation of axially siloxylated porphyrazines (Pr3SiO)2SiPzAr8, followed by the reductive contraction of the macrocycle and formation of the corresponding corrolazine complexes (Pr3SiO)SiCzAr8. It is shown that the addition of acid (trifluoroacetic acid, TFA) facilitates the detachment of one siloxy group in (Pr3SiO)2SiPzAr8 and is essential for its Pz → Cz transformation. In the presence of TFA, only one meso-nitrogen is protonated in the porphyrazine complexes (Pr3SiO)2SiPzAr8 (stability constant of the protonated form pKs1 = -0.45 for Ar = Ph; pKs1 = 0.68 for Ar = tBuPh), while two consequent protonation stages are observed for the more basic corrolazine complex (Pr3SiO)SiCzPh8 (pKs1 = 0.93, pKs2 = 0.45). Both types of Si(IV) complexes are poorly fluorescent (ΦF < 0.07). The porphyrazine complexes have low ability to generate singlet oxygen (ΦΔ < 0.15), whereas the corrolazine derivative (Pr3SiO)SiCzPh8 is a very efficient photosensitizer (ΦΔ = 0.76).