Department of Chemistry, Faculty of Science, University of Damascus, Syria.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Sep;79(5):1909-14. doi: 10.1016/j.saa.2011.05.087. Epub 2011 Jun 12.
Two new Schiff bases (I) and (II) containing nitrogen-sulfur-oxygen donor atoms were designed and synthesized in a multi-step reaction sequence. The Schiff base (I) was used in solvent extraction of metal chlorides such as Cu2+ and Cr3+ as well as metal picrates such as Hg2+ and UO2(2+) from aqueous phase to the organic phase. The influences of the parameter functions, such as pH, solvent, ionic strength of aqueous phase, aqueous to organic phase and concentration of the extractant were investigated to shed light on their chemical extracting properties upon the extractability of metal ions. The effect of chloroform, dichloromethane and nitrobenzene as organic solvents over the metal chlorides extraction was investigated at 25±0.1 °C by using flame atomic absorption and the result is that the ability of extraction in solvents as follows: C6H5NO2>CHCl3>CH2Cl2 and the compositions of the extracted species have been determined. The metal picrate extraction was investigated at 25±0.1 °C by using UV-visible spectrometry. As well that the extraction of picrates metal such as UO2(2+) and Hg2+ with Schiff base(I) in absence and presence of 2-(2-aminoethyl) pyridine was investigated in chloroform. The extraction results revealed the presence of neutral donors 2-(2-aminoethyl) pyridine shifts the extraction percentage curves towards higher pH region, indicating a synergistic effect of this donors on extraction of UO2(2+) and Hg2+ by the studied Schiff base (I).
两种新的席夫碱（I）和（II），含有氮硫氧供体原子，通过多步反应序列设计并合成。希夫碱（I）被用于溶剂萃取金属氯化物，如 Cu2+和 Cr3+，以及金属苦味酸盐，如 Hg2+和 UO2（2+），从水相到有机相。考察了参数函数（如 pH 值、溶剂、水相离子强度、水相/有机相比和萃取剂浓度）的影响，以揭示其对金属离子萃取性的化学萃取性质。考察了氯仿、二氯甲烷和硝基苯作为有机溶剂对金属氯化物萃取的影响，在 25±0.1°C 下，通过火焰原子吸收法，结果表明萃取能力如下：C6H5NO2>CHCl3>CH2Cl2，并且确定了萃取物种的组成。在 25±0.1°C 下，通过紫外可见光谱法研究了苦味酸盐金属的萃取。在氯仿中，研究了希夫碱（I）在没有和存在 2-（2-氨基乙基）吡啶的情况下对苦味酸盐金属 UO2（2+）和 Hg2+的萃取。萃取结果表明，中性供体 2-（2-氨基乙基）吡啶的存在将萃取百分比曲线移向更高的 pH 区域，表明该供体对研究希夫碱（I）萃取 UO2（2+）和 Hg2+的协同效应。
