A multinuclear (1H, 13C, 113Cd) nuclear magnetic resonance and magnetic circular dichroism spectroscopic study of thiolate complexes of cadmium
作者:Geetha K. Carson、Philip A.W. Dean、Martin J. Stillman
DOI:10.1016/s0020-1693(00)88548-5
日期:1981.1
chemical shifts are given for the complexes formed by 31 different thiolates individually in water at ambient probe temperature, and slow-exchange 1H and/or 13C and/or 113Cd NMR spectra are reported for several typical complexes at reduced temperature in CD3OD. In aqueous solution at ambient probe temperature, ligands with vicinal thiolate groups and −SCH2CHRS− (R = H, Me, Et, CH2OH, CH2SO−3 or CH2S−)) form
1H,13C和113Cd NMR的适当组合已用于研究ca。在过量的硫醇盐存在下,由相应的难溶性硫氰酸镉形成的0.05M溶液中,富含113Cd的大量硫氰酸镧盐酸盐。此外,已记录了MCD光谱的稀度。10-5M,一组代表性的硫醇盐络合物的溶液。对于在环境探针温度下由31种不同的硫醇盐在水中分别形成的配合物,给出了镉113的化学位移,并且在CD3OD中报道了几种典型的配合物在降低的温度下的慢速交换1H和/或13C和/或113Cd NMR光谱。在环境探针温度下的水溶液中,具有邻位硫醇盐基团和-SCH2CHRS-(R = H,Me,Et,CH2OH,CH2SO-3或CH2S-)的配体形成具有δCd⪖778 ppm的双(螯合物)络合物,镉的局部微观对称性接近四面体。具体而言,在[Cd(SR)2.5] 0.5n-n(R = Me,Et或Pr)络合物在250 nm区域的S→Cd电荷转移带下表现出良好分辨的对称A项。二硫醇盐-S(CH2nS-(n