Synthesis and properties of Zn(II)-salicylidene amino acid complexes

The synthesis of nine Zn(II) salicylideneamino acid complexes is reported. The structures of the complexes have been investigated by chemical analyses, electronic and infrared spectra, as well as molar conductance measurements. The apparent complex formation constants have been determined.

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Synthese und Eigenschaften von Zn(II)-Salicyliden-Aminosäure-Komplexen

Zusammenfassung Es wird die Synthese von neun Zn(II)-Salicylidenaminosäurekomplexen berichtet. Die Struktur der Komplexe wurde mittels chemischer Analyse, den Elektronen- und IR-Spektren und auch aus Leitfähigkeitsmessungen ermittelt. Die effektiven Komplexbildungskonstanten wurden ebenfalls bestimmt.

     

H2O-C2H5OH-MX(NaCl等)体系中离子缔合和活度

用桥式电路测定了H_2O-C_2H_5OH-NaCl体系的摩尔电导, 并用Lee-Wheaton模型回归出H_2O-C_2H_5OH-NaCl(KCl、CsCl、KBr)体系的离子缔合常数、极限摩尔电导和距离参数, 并求出缔合反应标准自由焓。结果表明离子缔合能力的顺序为Cs~+>K~+>Na~+, Cl~->Br~-, 此四种盐在乙醇中都形成溶剂分开型离子对。并用液上空间气相色谱法测定了水-乙醇-(NaCl、KCl、KBr)体系中溶剂的活度, 用改进的Pitzer-Li公式计算了此体系的活度系数, 计算时考虑了盐在低介电常数溶剂中的离子缔合, 结果表明这种处理是合适的。还表明离子缔合程度随着乙醇浓度上升而加大, 以及盐的存在对水呈盐溶效应而对乙醇呈盐析效应。     

Prediction of gas chromatographic retention indices of linear,branched, and cyclic alkanes from their physicochemical properties

Kováts retention indices for a series of linear, branched, and cyclic alkanes on squalane at any temperature, and on other stationary phases of different polarity at a given temperature, are related to physicochemical properties of the solutes, such as boiling point and molar refraction, by multiple regression analysis. The equations found permit calculation of the Kováts retention index for all alkanes, with standard deviations close to experimental error. The same equations can also be used for calculating the physicochemical parameters they contain.     

Single-ion and molar conductances. Application to transference number data analysis

Several of the present molar conductance equations have been examined in detail in order to obtain equations for the concentration dependence of the single-ion conductances which, when combined with existing conductance and transference data, permit three independent evaluations of the conductance parameters, in particular the association constant and the distance of closest approach of two ions of opposite charge. In order to make use of existing transference data it was necessary to develop a suitable extrapolation equation. It is shown that the procedures outlined constitute a useful test of the concentration dependence of transference numbers found experimentally.Equipe de recherche associée au C.N.R.S., ERA 310.     

二甲基甲酰胺-二氧六环混合溶剂中KBr,KSCN及KClO_4的电导研究

本文报告了KBr、KSC N、KClO_4和KI在二甲基甲酰胺(DMF)和1,4-二氧六环混合溶剂中的电导测定值、溶剂的粘度和溶液的密度,按Pitts,Fuoss1978和Lee-Wheaton电导方程拟合实验数据得出溶液的无限稀释摩尔电导A_o,离子缔合常数K_α和正负离子间的距离参数R。对三个方程的适用性和溶液中离子-离子-溶剂分子间的相互作用作了初步讨论。     

Application of stress induces ascorbate peroxidases of S. polyrhiza for green-synthesis Cu nanoparticles

The objective of this study was to assess the effects of stress on physiology/biochemical component of S. polyrhiza and its impact on CuNPs synthesis and bioethanol production. NaCl with RV5 provokes oxidative stress in S. polyrhiza and significantly increase MAD, Proline, H₂O₂, ROS, SOD and APX activity compare to control condition. Starch accumulation in S. polyrhiza was found 354% higher and correspond 4.4 times higher ethanol yield under stress condition compare to control. CuNPs were synthesized with an average size of 23–26 nm by purified fraction of APX having 37 KDa MW, 1.44 IU specific activity. Synthesized CuNPs were stable up to 15 consecutive cycles and potency against wide range of reactive dyes. The maximum remedial efficiency of synthesized CuNPs for COD and BOD was 55263.3 ± 3298.5 mg/m³min. and 30560.3 ± 1987.5 mg/m³min. respectively for RV5 wastewater. 0.072 mg/g of bioethanol was produced from the wet pulp remaining after nanoparticles synthesis. High efficiency of CuNPs and significant production of Ethanol, indicate that the feasibility for circular model for continuous industrial wastewater treatment.     

Studies on molar volume and rheology of terbium soaps in a benzene-DMF mixture

Summary Molar volume (V), apparent molar volume (_v), and fluidity () of terbium soaps in benzene-DMF (7:3 v/v) were evaluated at constant temperature from density and viscosity measurements. The results were used to determine the critical micelle concentration (CMC), soap-solvent and soap-soap interactions, and the effect of the chain length of soap molecules on various parameters. The molar volume and viscosity results are discussed in terms of known relations.

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Untersuchungen zum Molvolumen und zur Rheologie von Terbiumseifen in Benzol-DMF

Zusammenfassung Molvolumen (V), scheinbares Molvolumen (_v) und Fluidität () von Terbiumseifen in einer Mischung aus Benzol undDMF (7:3 v/v) wurden bei konstanter Temperatur aus Dichte-und Viskositätsmessungen ermittelt. Aus den Ergebnissen wurden die kritische Micellenkonzentration (CMC), Seifen-Lösungsmittel- und Seifen-Seifen-Wechselwirkungen sowie der Effekt der Kettenlänge der Seifenmoleküle auf verschiedene Parameter bestimmt. Die Resultate bezüglich Molvolumen und Viskosität werden anhand bekannter Beziehungen diskutiert.

     

四硫代富瓦烯/四氰基对二次甲基苯醌单分子膜气-液界面性质及LB膜组装体的紫外可见光谱

几种电子给体（四硫代富瓦烯，ＴＴＦ）、电子受体（长链四氰基对二次甲基苯醌；Ｃ１８ ＴＣＮＱ）及它们相应的 １：１摩尔比复合物的气－液界面分子行为表明：不带长链的 ＴＴＣ１－ ＴＴＦ、ＢＥＤＴ－ＴＴＦ的成膜性在其与Ｃ１８ＴＣＮＱ形成复合物之后均得到显著改善。Ｃ１６ＴＴＦ、Ｃ１８ ＴＣＮＱ及两者不同结构ＬＢ膜组装体的紫外可见光谱研究发现：Ｃ１８ＴＣＮＱ在其单独的Ｙ－型 膜中摩尔吸光系数是７．５×１０３，而在交替组装体中其摩尔吸光系数是１．３×１０３，给受体之间 的相互作用导致跃迁偶极矩减小，从而引起吸光系数减小４倍多。     

介电法研究萃取过程中分子间的络合作用

用介电法测定若干重要萃取剂的摩尔极化度和偶极矩，研究协萃体系中萃取剂之间的络合作用和协同萃了现象，求得缔合物、萃合物的摩尔极化度、偶极矩及缔合常数。