Rapid determination of Cl^- by light-absorption ratio variation approach using Cl^-eosin Y-Ag^＋ adsorptive precipitation

The adsorptive precipitation between eosin Y （EY） and AgCl colloids at pH 3.73 caused the sensitive color change of the solution. The reaction mechanism between EY and AgCl was analyzed and this reaction was used for determination of Cl^- in trace level by the light-absorption radio variation approach.

Fe^(3+) 偶联的Eosin-Y染料敏化Pt/ZnO可见光制氢活性

以浸渍法制备了Eosin-Y染料敏化的EY-Pt/ZnO和Fe^(3+)偶联的EY-Fe-Pt/ZnO光催化剂。利用XRD、UV-Vis漫反射光谱、FTIR光谱、XPS能谱和电化学方法对催化剂进行了表征。以三甲胺(TMA)为电子给体,考察了催化剂在可见光(λ≥420 nm)照射下的光催化分解水制氢活性。结果表明:Eosin-Y染料的敏化使Pt/ZnO对可见光有较强的吸收和放氢活性。Fe^(3+)离子偶联后提高了Eosin-Y染料在Pt/ZnO光催化剂表面的吸附,促进了光生电子-空穴的分离,使催化剂可见光制氢活性和稳定性得以提高。最佳条件下,经过8 h光照,Fe^(3+)离子偶联的催化剂EY(0.05)-Fe(0.003)-Pt/ZnO的制氢活性比单一用Eosin-Y染料敏化的催化剂EY(0.05)-Pt/ZnO的制氢活性提高了47%。

Two New Coordination Complexes Based on Eosin Y Dye Ligand：Syntheses,Crystal Structures and Magnetic Properties

Two novel coordination compounds formulated as [Co2（EY）2（L1）]·2C2H5OH（1） and [Mn2（EY）2（L1）]·2C2H5OH（2）（EY = Eosin Y dianion, L1 = 4,4＇-bipyridine） based on Eosin Y dye ligand have been prepared by solvothermal reactions and structurally characterized. Single-crystal X-ray diffraction studies reveal that compounds 1 and 2 are isostructural. They show weak antiferromagnetic coupling between the adjacent Co^Ⅱ and Mn^Ⅱ ions, respectively.

Kinetics of Degradation of Eosin Y by One of the Advanced Oxidation Processes (AOPs)—Fenton’s Process

Kinetics of homogeneous degradation of Eosin Y (EY), also known as Acid red 87 (CI 45380), are studied, mostly using Fenton’s process, at 30℃ by monitoring its absorbance at 517 nm (λmax of EY). This process is one of the advanced oxidation processes (AOPs). Mixture of H2O2 and Fe(II) ion in acetate buffer medium (pH 2.74 - 4.56) generates hydroxyl free radicals (?OH) which attack the dye molecules, resulting in degradation of the dye molecules. Results show that the initial rate of EY degradation decreases with the increasing of solution pH because of removal of kinetically important Fe (iron) species through formation of ferric hydroxide. On the other hand, the rate increases with increasing the concentrations of H2O2, Fe(II) and EY at low solution pH. The initial rate increases with increasing of concentration of H2O2 and, subsequently remains unaffected with further increase of its concentration at a constant Fe(II) concentration because of the enhanced scavenging environment created by H2O2 at its higher concentration. The initial rate also increases with increasing of concentration of Fe(II) at a constant H2O2 concentration and remains unaffected with its further increase. EY concentration also enhances the initial rate at low pH. However, the initial rate is significantly enhanced by UV light. This is because of formation of additional hydroxyl radicals through excitation of the dye molecules by UV light. During the period of experiment, EY in aqueous solution alone hardly suffered any degradation. Degradation mechanism of EY by the Fenton and photo-Fenton’s processes is also discussed. Statistical analysis was used to validate the experimental results. Low values of the standard deviation for both the initial rate and % degradation indicated the consistency of the experimental data.

Sol-Gel γ-Al2O3 Nanoparticles Assessment of the Removal of Eosin Yellow Using: Adsorption, Kinetic and Thermodynamic Parameters

The adsorption behavior of eosin yellow (EY) from aqueous solution onto γ-Al2O3 nanoparticles in batch technique was studied. γ-Al2O3 NPs was prepared and characterized by SEM, TEM, XRD and FTIR analysis. The effect of pH, dosage of adsorbent, contact time, temperature, and the initial concentration of dye was investigated. The maximum amount of dye removal found about 99.36% at pH4, the adsorption dose 1g/L, with the initial dye concentration of 100 mg/L, and the temperature of 25°C, with contact time 120 min. The adsorption behavior of the eosin yellow dye is applicable to Langmuir isotherm model, with the maximum sorption capacity of 47.78 mg/g of γ-Al2O3. The kinetic data also described by the pseudo-second-order model with a correlation coefficient (0.9999), and the mechanism of the process showed a multi-linear steps and the intra-particle diffusion was not only rate controlling step. The adsorption process was endothermic with positive enthalpy of 121.8 kJ/mol, and showed spontaneous process with a mean free energy -5.19 kJ/mol, and increase randomness, 369.77 J/mol. k, at the adsorbent solution interface. The adsorption process was chemisorption in nature The activation energy estimated from Arrhenius and modified Arrhenius is 40.9 kJ/mol, 106.37 kJ/mol respectively. The sticking probability of EY onto Al2O3 NPs very high estimated from the value of S* < 1, (4.82E-19).

稀土杂多配合物K_(15)[Ce(BW_(11)O_(39))_2]·17H_2O与BSA的相互作用

利用紫外光谱,以曙红Y(Eos in Y)为探针,考察了稀土杂多配合物K15[C e(BW11O39)2].17H2O与牛血清白蛋白(BSA)间的作用,K15[C e(BW11O39)2].17H2O与Eos in Y在BSA上有竞争结合,表面活性剂对两者间的竞争结合有增敏作用;并利用荧光光谱直接考察了K15[C e(BW11O39)2].17H2O与BSA的相互作用及其对BSA构象的影响。

Flow Injection Chemiluminescence Determination of Puerarin in Pharmaceutical Preparations Using Eosin Y-Fenton System

A novel chemiluminescence （CL） system was established for the determination of puerarin in pharmaceutical preparations. It was shown that a strong CL signal was observed when Eosin Y reacted with the hydroxyl radicals which were generated from Fenton reagent in acidic medium. The CL intensity was decreased significantly when puerarin was added to the reaction system and partially scavenged the hydroxyl radicals in the solution. The extent of decrease in the CL intensity had a good stoichiometrical relationship with puerarin concentration. Based on this, a new method for the determination of puerarin using a flow injection chemiluminescence technique was developed. The experimental parameters that affected the CL intensity were optimized. Under the optimal conditions, the linear range for puerarin concentration was 8.0 × 10^-8--2.0 × 10^-6 mol/L （R = 0.9982） with a detection limit of 7.5 × 10^-9 mol/L （S/N= 3） and the relative standard deviation was method was applied to the determination of puerarin in a 1.7% for 4.0× 10^-7 mol/L puerarin （n= 11）. The proposed puerarin injection with satisfactory results.

Metal-Free-Mediated Oxidation Aromatization of 1,4-Dihydropyridines to Pyridines Using Visible Light and Air

A metal-free and environmentally friendly aerobic aromatization photosensitized by organic dye eosin Y bis(tetrabutyl ammonium salt)(TBA-eosinY)has been developed.With the aid of K_(2)CO_(3),the aerobic catalytic system converts 1,4-dihydropyridines to their corresponding pyridine derivatives efficiently under visible light irradiation(λ=450 nm)at room temperature.

Synthesis and biological evaluation of new peroxo-bridged diosgenin derivatives

Objective： In order to find lead compound with anti-HBV activity from peroxo-bridged diosgenin deriva- tives obtained with Eosin Y as the photosensitizer. Method： Eosin Y was used as the photosensitizer to activate the oxygen in the air to synthesize novel diosgenin derivatives with peroxo-bridge. The structures of synthesized compounds were identified by NMR and HR-MS. Their cytotoxicity and antihepatitis B activity were evaluated via MTS assay and ELISA method, respectively. Results： Six diosgenin derivatives were synthesized, three of which contained peroxo-bridge, and their structures were confirmed by spectroscopy. It showed that 5a,8a-peroxo-6-alkenyl-diosgenin （7） could suppress the production of HBsAg on transfected HepG2.2.15 cells at low-toxic concentration and the in- hibition rate on HepG2.2.15 cells was 18.28% at 12.50 μg/mL, better than that of 3TC （7.30% at 12.50 μg/mL） and others. Conclusion： Due to its lower cytotoxicity and potential anti-hepatitis B activity, compound 7 could be developed as the promising candidate of anti-hepatitis B drug. It also indicated that the peroxo-bridged derivatives had potential biological values for developing clinical agents.

An Eosin Y Encapsulated Cu(Ⅰ)Covalent Metal Organic Framework for Efficient Photocatalytic Sonogashira Cross-coupling Reaction

Sonogashira cross-coupling reaction is significant for the formation of C―C bonds and the creation of new substance in organic synthesis,which is usually catalyzed using noble metal,such as palladium or non-precious metal,such as copper under harsh reaction conditions.Herein,we report the encapsulation of an organic dye(i.e.,Eosin Y,EY)into a Cu(I)cyclic trinuclear unit(CTU)based covalent-metal organic framework(CMOF),namely EY@JNM-1,which demonstrates outstanding photocatalytic performance for the Sonogashira cross-coupling reaction of iodobenzene with alkynes.The EY@JNM-1 not only exhibited high catalytic activity for the alkynes(>99%conversion)and excellent selectivity for the cross-coupling product(>99%)under mild conditions,but also displayed excellent stability and recyclability.