4-cyanobenzoic Acid Research Articles

Interfacial Dipole Engineering for Energy Level Alignment in NiOx-Based Quantum Dot Light-Emitting Diodes.

The solution-derived non-stoichiometric nickel oxide (NiOx) is a promising hole-injecting material for stable quantum dot light-emitting diodes (QLEDs). However, the carrier imbalance due to the misalignment of energy levels between the NiOx and polymeric hole-transporting layers (HTLs) curtails the device efficiency. In this study, the modification of the NiOx surface is investigated using either 3-cyanobenzoic acid (3-CN-BA) or 4-cyanobenzoic acid (4-CN-BA) in the QLED fabrication. Morphological and electrical analyses revealed that both 4-CN-BA and 3-CN-BA can enhance the work function of NiOx, reduce the oxygen vacancies on the NiOx surface, and facilitate a uniform morphology for subsequent HTL layers. Moreover, it is found that the binding configurations of dipole molecules as a function of the substitution position of the tail group significantly impact the work function of underlying layers. When integrated in QLEDs, the modification layers resulted in a significant improvement in the electroluminescent efficiency due to the enhancement of energy level alignment and charge balance within the devices. Specifically, QLEDs incorporating 4-CN-BA achieved a champion external quantum efficiency (EQE) of 20.34%, which is a 1.8X improvement in comparison with that of the devices utilizing unmodified NiOx (7.28%). Moreover, QLEDs with 4-CN-BA and 3-CN-BA modifications exhibited prolonged operational lifetimes, indicating potential for practical applications.

Modification of nitrilase based on computer screening and efficient biosynthesis of 4-cyanobenzoic acid.

4-cyanobenzoic acid serves as a crucial intermediate for the synthesis of various high-value organic compounds. The enzymatic hydrolysis of terephthalonitrile to produce 4-cyanobenzoic acid using nitrilase offers the advantages of a simple reaction pathway, environmental friendliness, and easy product separation. In order to efficiently develop nitrilases that meet industrial production requirements, the virtual screening method used in the study is established and mature. From a total of 371 amino acids in the nitrilase AfNIT, which exhibits activity in terephthalonitrile hydrolysis, three candidate sites (F168, S192, and T201) were identified, and a "small and accurate" mutant library was constructed. The triple mutant F168V/T201N/S192F was screened from this small mutant library with a specific activity of 227.3 Umg-1 , which was 3.8 times higher than that of the wild-type AfNIT. Using the whole-cell biocatalyst containing the mutant F168V/T201N/S192F, terephthalonitrile was successfully hydrolyzed at a concentration of 150gL-1 to produce 4-cyanobenzoic acid with a final yield of 170.3gL-1 and a conversion rate of 98.7%. The obtained nitrilase mutant F168V/T201N/S192F in this study can be effectively applied in the biomanufacturing of 4-cyanobenzoic acid using terephthalonitrile as a substrate. Furthermore, the results also demonstrate the significant improvement in predictive accuracy achieved through the latest AI-assisted computer simulation methods. This approach represents a promising and feasible new technological pathway for assisting enzyme engineering research, laying a theoretical foundation for other related studies.

Investigation on solid–liquid equilibrium behavior of 4-cyanobenzoic acid in fourteen mono-solvents: Determination, correlation, molecular simulation and thermodynamic analysis

4-Cyanobenzoic acid (4-CyBZA) is an important pharmaceutical intermediate, and the research on solubility behavior of 4-CyBZA in organic solvents is very necessary for its crystallization and separation processes. Therefore, this study aimed at exploring dissolution behavior of 4-CyBZA in several pure solvents via experiment, calculation, and simulation process. In this study, mole-fraction solubility values of 4-CyBZA in fourteen common solvents including four low alcohols (methanol (MeOH), ethanol (EtOH), n-propanol (NPOH), n-butanol (NBOH)), four acetates (methyl acetate (MeAC), ethyl acetate (EtAC), n-propyl acetate (NPAC), n-butyl acetate (NBAC)), two alcohol ethers (2-ethoxyethanol (EGEE), 2-methoxyethanol (EGME)) as well as four common heteroatom/heterocyclic solvents (acetonitrile (MeCN), N,N-dimethylformamide (DMF), N-methylpyrrolidone (NMP), 1,4-dioxane (Diox)) were critically measured by using laser monitoring method from 278.15/288.15 K to 323.15 K under 100 kPa. Interestingly, experimental results indicated that an increase in temperature facilitated the dissolution of 4-CyBZA in selected 14 solvents. At the same time, the solubility curve underwent a crossover phenomenon. At 298.15 K, the common order of 4-CyBZA solubility was: DMF > EGME > EGEE > NMP > Diox > MeOH > MeAC > EtOH > EtAC > NPAC > NPOH > NBOH > NBAC > MeCN. The Hansen solubility parameter (HSP) was introduced to analyze solubility behavior via molecular similarity between 4-CyBZA and chosen solvents. Molecular modeling including Hirshfeld surface (HS) analysis and molecular electrostatic potential surface (MEPS) were employed to understand internal interactions within 4-CyBZA crystals. Moreover, solubility was fitted by Margules model, NRTL model, NRTL-SAC model, UNIQUAC model as well as a combined model (Jouyban model). Results showed that NRTL and NRTL-SAC model were more suitable for correlating 4-CyBZA solubility with absolute temperature. Furthermore, given the high accuracy of the NRTL model, dissolution thermodynamic characteristics of 4-CyBZA in chosen solvents were analyzed by NRTL model, which revealed that the dissolving process and mixing process were spontaneous and entropy-driven.

Improved photoluminescence properties of one-dimensional (1D) composite fibers of Ho@PVP and Yb@PVP prepared by electrospinning

Two new Holmium3+ and Ytterbium3+ compounds, {Ho(4cba)3(phen)(H2O)} (1) and {Yb(4cba)3(phen)} (2) (4cba = 4-Cyanobenzoic acid, phen = 1,10-Phenanthroline) were synthesized. These compounds were then incorporated into a Polyvinylpyrrolidone (PVP) matrix at different concentrations (5 wt% to 25 wt%) using an electrospinning technique, resulting in the formation of 1D luminescent composite fibers, Ho@PVP and Yb@PVP. The products were analyzed using various characterization techniques to determine their structures and morphologies. A comprehensive study was conducted to investigate the thermal and photoluminescence properties of these composite nanofibers in comparison to their pure compounds. The findings revealed significant enhancements in the photostability and thermal stability of the composite nanofibers due to the solid environment provided by PVP for the compounds. Furthermore, it was observed that the composite nanofibers exhibited notably superior the thermal-stability and the photo-stability when compared to their pure compounds.

Synthesis and Luminescent Properties of s-Tetrazine Derivatives Conjugated with the 4H-1,2,4-Triazole Ring.

New derivatives obtained by the combination of unique 1,2,4,5-tetrazine and 4H-1,2,4-triazole rings have great application potential in many fields. Therefore, two synthetic few-step methodologies, which make use of commercially available 4-cyanobenzoic acid (method A) and ethyl diazoacetate (method B), were applied to produce two groups of the aforementioned heterocyclic conjugates. In both cases, the target compounds were obtained in various combinations, by introducing electron-donating or electron-withdrawing substituents into the terminal rings, together with aromatic or aliphatic substituents on the triazole nitrogen atom. Synthesis of such designed systems made it possible to analyze the influence of individual elements of the structure on the reaction course, as well as the absorption and emission properties. The structure of all products was confirmed by conventional spectroscopic methods, and their luminescent properties were also determined.

Secondary reactions in the analysis of microplastics by analytical pyrolysis

Mixtures of plastic particles of different types were analysed by Py-GC-MS in order to investigate the effect of polymer interactions on the composition of pyrolysates. Pyrolysis products associated to secondary reactions were observed when particles of poly(ethylene terephthalate) (PET) were pyrolysed in the presence of poly(vinylchloride) (PVC) and the polyamides PA6 (polycaproamide) and PA66 (poly(hexamethylene adipamide)). Co-pyrolysis of PET in the presence of PVC particles produced mono and dichloroethyl esters of terephthalic acid due to the addition of HCl to the double bond of the vinyl group. Benzyl chloride, benzoyl chloride, 4-chlorobenzoic acid were also tentatively identified. The interaction between PET and PA6 and above all PA66 brought about the formation of aromatic nitriles including methyl and ethyl benzonitrile, 1,4-benzenedicarbonitrile, 4-cyanoethyl benzoate, 4-cyano benzoic acid. In addition, co-pyrolysis of PET and PA66 particles produced N-alkyl amides of benzoic acid. Pyrolysis of benzoic acid generated benzene and diphenyl, while N-hexylbenzamide was observed from the pyrolysis of benzoic acid with hexyl-1-amine or hexan-1,6-diamine. PE (polyethylene), PP (polypropylene), PS (polystyrene) and PVC did not exhibit significant interactions. Calibration curves built up with single plastic types in the 10–120 µg range were used to quantify each polymer in the mixture using typical pyrolytic markers. The highest deviations of recovery and the lowest RSD were observed for PET and PA6, while polyolefins produced satisfactory recovery and RSD. The detection of pyrolysis products from secondary reactions can be used as markers for the co-presence of different polymers supporting their identification.

Synthesis, characterization and self-assembly of new cholesteryl-substitued sym-tetrazine: Fluorescence, gelation and mesogenic properties

Fluorescent liquid crystalline organogels have been considered as proper candidates for low-energy consumption electronic displays particularly for portable flexible electronics. Herein, we synthesized novel fluorescent symmetric 3,6-bis(4-(cholesterylester)phenyl)-1,2,4,5-tetrazine (sym-Tetrazine; DCh-Tz) liquid crystalline low molecular weight organogelator (LMWO). The molecular structure of the prepared sym-Tetrazine was characterized by different spectroscopic methods, including 1H/13C NMR and FT-IR spectra. The new oganogelator, sym-tetrazine, was synthesized via an addition reaction of hydrazine monohydrate with 4-cyanobenzoic acid to give the corresponding dihydrotetrazine. The product of the addition reaction was subjected to an oxidation reaction to give 3,6-bis(4-carboxyphenyl)-tetrazine to interact with cholesterol affording the desired DCh-Tz. It was proved to possess fairly high gelation capability to generate nanofibers in various alcohols, such as 1,6-dihydroxyhexane, n-octanol and n-butanol. The mesogenic phases of the prepared cholesterylester s-tetrazine were studied by POM and DSC. The photophysical properties of the new fluorescent and thermoreversible low molecular weight organogelator from cholesterylester s-tetrazine were discussed. Both of UV-Vis absorption and fluorescence spectra showed a solvatochromic and solvatofluorochromic activities, respectively. The supramolecular self-assembly of the synthesized cholesterylester s-tetrazine occurred via van der Waals and π-stack interaction forces to result in the gelation of various organic solvents. A dried xerogel of the cholesterylester s-tetrazine was studied by scanning electron microscopy (SEM) to show fiber-like nano-scaled scaffolds. Both of cytotoxicity and antimicrobial properties were explored to prove the use the current DCh-Tz for other potential applications, such as bioimaging and drug delivery systems.

A closer look into the distance dependence of vibrational energy transfer on surfaces using 2D IR spectroscopy.

Vibrational energy transfer (VET) between two isotopologues of [Re(dcb)(CO)3Br] immobilized on a TiO2 surface is studied with the help of 2D IR spectroscopy in dependence of surface coverage. To dilute the molecules on the surface, and thereby control the intermolecular distances, two different diluents have been used: a third isotopologue of the same molecule and 4-cyanobenzoic acid. As expected, the VET rate decreases with dilution. For a quantitative investigation of the distance dependence of the VET rate, we analyze the data based on an excitonic model. This model reveals the typical 1/r6-distance dependence for a dimer of a donor and acceptor, similar to the nuclear Overhauser effect in NMR spectroscopy or Förster resonant energy transfer in electronic spectroscopy. However, VET becomes a collective phenomenon on the surface, with the existence of a network of coupled molecules and its disappearance below a percolation threshold, dominating the concentration dependence of the VET rate.

Highly fluorescent 1,2,4,5-tetrazine derivatives containing 1,3,4-oxadiazole ring conjugated via a 1,4-phenylene linker

Symmetrical and unsymmetrical 1,2,4,5-tetrazine derivatives containing 1,3,4-oxadiazole ring were obtained in high yields using commercially-available 4-cyanobenzoic acid, hydrazine hydrate and carboxylic acid chlorides. The few-step transformation involved the Pinner reaction and the subsequent mild oxidation of 1,4-dihydro-1,2,4,5-tetrazines using hydrogen peroxide at room temperature. The obtained compounds exhibited luminescent properties and large quantum yields.

Electrocatalytic Processes for the Valorization of CO2: Synthesis of Cyanobenzoic Acid Using Eco-Friendly Strategies

Carbon dioxide (CO2) is a known greenhouse gas, and is the most important contributor to global warming. Therefore, one of the main challenges is to either eliminate or reuse it through the synthesis of value-added products, such as carboxylated derivatives. One of the most promising approaches for activating, capturing, and valorizing CO2 is the use of electrochemical techniques. In the current manuscript, we described an electrocarboxylation route for synthesizing 4-cyanobenzoic acid by valorizing CO2 through the synergistic use of electrochemical techniques (“green technology”) and ionic liquids (ILs) (“green solvents”)—two of the major entries in the general green chemistry tool kit. Moreover, the use of silver cathodes and ILs enabled the electrochemical potential applied to be reduced by more than 0.4 V. The “green” synthesis of those derivatives would provide a suitable environmentally friendly process for the design of plasticizers based on phthalate derivatives.

Synthesis, Crystal Structure and Antitumour Activity of 4-(3-Amino-4-Morpholino-1H-Indazole-1-Carbonyl)Benzonitrile

The title compound, 4-(3-amino-4-morpholino-1 H-indazole-1-carbonyl)benzonitrile was synthesised by condensation of 4-cyanobenzoic acid with 4-morpholino-1 H-indazol-3-amine, which was prepared from 2,6-difluorobenzonitrile by amination with morpholine and then cyclisation with hydrazine hydrate. The crystal structure of the title compound was determined and the crystals belong to the monoclinic system, space group P21/ c. In addition, the compound showed some inhibition of the proliferation of some cancer cell lines.

Multimetallic Complexes and Functionalized Nanoparticles Based on Oxygen- and Nitrogen-Donor Combinations

The versatile precursors [Ru(CH═CHC6H4Me-4)Cl(CO)(BTD)(PPh3)2] (BTD = 2,1,3-benzothiadiazole) and [Ru(C(C≡CPh)═CHPh)Cl(CO)(PPh3)2] were treated with isonicotinic acid, 4-cyanobenzoic acid, and 4-(4-pyridyl)benzoic acid under basic conditions to yield [Ru(vinyl)(O2CC5H4N)(CO)(PPh3)2], [Ru(vinyl)(O2CC6H4CN-4)(CO)(PPh3)2], and [Ru(vinyl){O2CC6H4(C5H4N)-4}(CO)(PPh3)2], respectively. The osmium analogue [Os(CH═CHC6H4Me-4)(O2CC5H4N)(CO)(PPh3)2] was also prepared. cis-[RuCl2(dppm)2] was used to prepare the cationic compounds [Ru(O2CC5H4N)(dppm)2](+) and [Ru{O2CC6H4(C5H4N)-4}(dppm)2](+). The treatment of 2 equiv of [Ru(C(C≡CPh)═CHPh)(O2CC5H4N)(CO)(PPh3)2] and [Ru(O2CC5H4N)(dppm)2](+) with AgOTf led to the trimetallic compounds [{Ru(C(C≡CPh)═CHPh)(CO)(PPh3)2(O2CC5H4N)}2Ag](+) and [{Ru(dppm)2(O2CC5H4N)}2Ag](3+). In a similar manner, the reaction of [Ru(O2CC5H4N)(dppm)2](+) with PdCl2 or K2PtCl4 yielded [{Ru(dppm)2(O2CC5H4N)}2MCl2](2+) (M = Pd, Pt). The reaction of [RuHCl(CO)(BTD)(PPh3)2] with HC≡CC6H4F-4 provided [Ru(CH═CHC6H4F-4)Cl(CO)(BTD)(PPh3)2], which was treated with isonicotinic acid and base to yield [Ru(CH═CHC6H4F-4)(O2CC5H4N)(CO)(PPh3)2]. The addition of [Au(C6F5)(tht)] (tht = tetrahydrothiophene) resulted in the formation of [Ru(CH═CHC6H4F-4){O2CC5H4N(AuC6F5)}(CO)(PPh3)2]. Similarly, [Ru(vinyl)(O2CC6H4CN-4)(CO)(PPh3)2] reacted with [Au(C6F5)(tht)] to provide [Ru(vinyl){O2CC6H4(CNAuC6F5)-4}(CO)(PPh3)2]. The reaction of 4-cyanobenzoic acid with [Au(C6F5)(tht)] yielded [Au(C6F5)(NCC6H4CO2H-4)]. This compound was used to prepare [Ru(CH═CHC6H4F-4){O2CC6H4(CNAuC6F5)-4}(CO)(PPh3)2], which was also formed on treatment of [Ru(CH═CHC6H4F-4)(O2CC6H4CN-4)(CO)(PPh3)2] with [Au(C6F5)(tht)]. The known compound [RhCl2(NC5H4CO2)(NC5H4CO2Na)3] and the new complex [RhCl2{NC5H4(C6H4CO2)-4}{NC5H4(C6H4CO2Na)-4}3] were prepared from RhCl3·3H2O and isonicotinic acid or 4-(4-pyridyl)benzoic acid, respectively. The former was treated with [Ru(CH═CHC6H4Me-4)Cl(CO)(BTD)(PPh3)2] to yield [RhCl2{NC5H4CO2(Ru(CH═CHC6H4Me-4)(CO)(PPh3)2}4]Cl. As an alternative route to pentametallic compounds, the Pd-coordinated porphyrin [(Pd-TPP)(p-CO2H)4] was treated with 4 equiv of [Ru(CH═CHR)Cl(CO)(BTD)(PPh3)2] in the presence of a base to yield [(Pd-TPP){p-CO2Ru(CH═CHR)(CO)(PPh3)2}4] (R = C6H4Me-4, CPh2OH). Where R = CPh2OH, treatment with HBF4 led to the formation of [(Pd-TPP){p-CO2Ru(═CHCH═CPh2)(CO)(PPh3)2}4](BF4)4. [(Pd-TPP){p-CO2Ru(dppm)2}4](PF6)4 was prepared from [(Pd-TPP)(p-CO2H)4] and cis-[RuCl2(dppm)2]. The reaction of AgNO3 with sodium borohydride in the presence of [Ru(O2CC5H4N)(dppm)2](+) or [RuR{O2CC6H4(C5H4N)-4}(dppm)2](+) provided silver nanoparticles Ag@[NC5H4CO2Ru(dppm)2](+) and Ag@[NC5H4{C6H4CO2Ru(dppm)2}-4](+).

Ancillary ligands assisted self-assembly of metal organic frameworks: Synthesis, crystal structures and photophysical properties of two Zn(II) complexes containing in-situ formed tetrazole ligands

Abstract Solvothermal reactions of 4-cyanobenzoic acid (HL1), NaN3, hydrated ZnSO4 in the presence of ancillary ligands pyrazine or 4,4′-dimethylbipyridine (Me2bpy) afforded a 3-D coordination polymer [Zn(L2)(H2O)]n (1) and a 2-D layer [Zn3(Me2bpy)(N3)2(L2)]n (2) (L2 = 4-tetrazolylbenzenecarboxylate), respectively in which pyrazine significantly alters the self-assembly of 1 and the coordination of Me2bpy in 2 leads to a novel linearly trinuclear [Zn3(Me2bpy)2(N3)2]4 + subunit functioning as a secondary building block (SUB). Their crystal structures have been determined by X-ray crystallography and solid state luminescent properties have been measured at room temperature.

Photoreduction of 4,4′-Dimercaptoazobenzene on Ag Revealed by Raman Scattering Spectroscopy

The surface-enhanced Raman scattering (SERS) of 4,4'-dimercaptoazobenzene (4,4'-DMAB) has recently seen a surge of interest, since it might be possible to form 4,4'-DMAB from 4-aminobenzenethiol (4-ABT) via a surface-induced photoreaction. We found in this study, however, that the reverse conversion of 4,4'-DMAB to 4-ABT on Ag is a more feasible process upon irradiation with a 514.5 nm (not 632.8 nm) laser under ambient conditions. First of all, the SERS spectral pattern of 4,4'-DMAB on Ag varied as a function of laser irradiation time, finally becoming the same as that of 4-ABT on Ag. Second, the coupling reaction with 4-cyanobenzoic acid to form amide bonds proceeded readily like 4-ABT once 4,4'-DMAB on Ag was exposed to 514.5 nm radiation. Third, the growth of a calcite crystal occurred on 4,4'-DMAB on Ag, also likely on 4-ABT, when it was exposed to 514.5 nm radiation beforehand. All of these results led us to conclude that the appearance of the so-called b(2)-type bands in the SERS of 4-ABT must be due to the involvement of the chemical enhancement mechanism, not due to the formation of 4,4'-DMAB.

Degradation of metaflumizone in soil: Impact of varying moisture, light, temperature, atmospheric CO2 level, soil type and soil sterilization

Soil is a major sink for the bulk of globally used pesticides. Hence, fate of pesticides in soil under the influence of various biotic and abiotic factors becomes important for evaluation of stability and safety. This paper presents the impact of varying moisture, light, temperature, atmospheric CO2 level, soil type and soil sterilization on degradation of metaflumizone, a newly registered insecticide in India.Degradation of metaflumizone in soil followed the first order reaction kinetics and its half life values varied from ∼20 to 150d. Under anaerobic condition, degradation of metaflumizone was faster (t½ 33.4d) compared to aerobic condition (t½ 50.1d) and dry soil (t½ 150.4d). Under different light exposures, degradation was the fastest under UV light (t½ 27.3d) followed by Xenon light (t½ 43d) and dark condition (t½ 50.1d). Degradation rate of metaflumizone increased with temperature and its half life values ranged from 30.1 to 100.3d. Elevated atmospheric CO2 level increased the degradation in soil (t½ 20.1–50.1d). However, overall degradation rate was the fastest at 550ppm atmospheric CO2 level, followed by 750ppm and ambient level (375ppm). Degradation of metaflumizone was faster in Oxisol (pH 5.2, Total Organic Carbon 1.2%) compared to Inceptisol (pH 8.15, TOC 0.36%). In sterile soil, only 5% dissipation of initial concentration was observed after 90d of sampling. Under various conditions, 4-cyanobenzoic acid (0.22–1.86mgkg−1) and 4-trifluoromethoxy aniline (0.21–1.23mgkg−1) were detected as major degradation products.

The firstin situ tetrazole synthesis of lanthanide metal coordination frameworks

Hydrothermal reaction of 4-cyanobenzoic acid with NaN3 in the presence of Ln(NO3)3 · 6H2O produced two lanthanide complexes, [LnL(HL)(H2O)5] [Ln = Eu (1) and Tb (2)] (H2L = 4-(1H-tetrazol-5-yl)benzoic acid). Both compounds were structurally characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. Complexes 1 and 2 are isostructural and display 3-D supramolecular frameworks. Solid-state properties such as thermal behaviors and photoluminescence for these crystalline materials were also investigated.

Self-Assembly Monolayer Molecules for the Improvement of the Anodic Interface in Bulk Heterojunction Solar Cells

Abstract Self-assembly monolayer (SAM) molecules were immobilized onto the surface of indium tin oxide (ITO) for the improvement of organic photovoltaic devices (OPVs). For bulk heterojunction (BHJ) solar cells, several key factors were considered in the choice of molecules for the improvement of the anodic ITO as follows: effects of anchoring groups, dipole moments, and aromatic bulk to photovoltaic properties. In particular, improvements of power conversion efficiencies (PCEs) of 4.5-4.7 times were observed from unmodified ITO with the use of benzoic acid and 4-cyanobenzoic acid monolayers.

A novel metal–organic framework with bifunctional tetrazolate-5-carboxylate ligand: Crystal structure and luminescent properties

Abstract Hydrothermal reaction of NaN3, Na(4-cba) (4-Hcba = 4-cyanobenzoic acid) and ZnBr2 afforded a novel 3D Zn(II) coordination polymer [Zn2(4-tzba)2(H2O)]n 1 (4-H2tzba = 4-(5H-tetrazol)benzoic acid). In situ [2 + 3] cycloaddition reaction of nitrile and azide in the presence of ZnBr2 yielded tetrazolate-5-carboxylate 4-tzba2− ligand. Compound 1 displays an unprecedented four-connected topological network with 1D hexagonal channels constructed from trigonal rings [Zn3(4-tzba)6]. The solid-state photoluminescent studies revealed that 1 exhibits a strong blue emission mainly originating from 4-tzba2− ligand-centered charge transition.

A Direct White-Light-Emitting Metal−Organic Framework with Tunable Yellow-to-White Photoluminescence by Variation of Excitation Light

A direct white-light metal-organic framework (MOF), [AgL](n) x nH(2)O (1, L = 4-cyanobenzoate), obtained by the reaction of deprotonated 4-cyanobenzoic acid and AgNO(3) in water, was found to exhibit tunable yellow-to-white photoluminescence by variation of excitation light. Interestingly, the close pure white emission of 1 has CIE-1931 chromaticity coordinates of (0.33, 0.34) when excited by 349-nm UV light, which is compatible to the light output of the deep UV LED.

Solubility of 3,5-Dimethoxybenzoic Acid, 4-Cyanobenzoic Acid, 4-Acetoxybenzoic Acid, 3,5-Diaminobenzoic Acid, and 2,4-Dichlorobenzoic Acid in Ethanol

The solubility of 3,5-dimethoxybenzoic acid, 4-cyanobenzoic acid, 4-acetoxybenzoic acid, 3,5-diaminobenzoic acid, and 2,4-dichlorobenzoic acid in ethanol was measured by both static method and dynamic method over the temperature range from (298.15 to 318.15) K under atmospheric pressure. The experimental data were correlated by the modified Apelblat model. The results show that the solubility of each acid increases with increasing temperature in ethanol, and the data have greater accuracy when using the static method than when using the dynamic method.