高价钼络合物化学——(Ⅱ)ESR和磁化率研究五价钼半胱氨酸体系的酸解反应

THE CHEMISTRY OF HIGH-VALENCE MOLYBDENUM:(Ⅱ)ESR AND MAGNETIC SUSCEPTIBILITY STUDY ON THE DISSOCIATION OF DIMOLYBDENUM (Ⅴ)—CYSTEINE COMPLEXES

本文利用ESR和磁化率为手段研究了二钼半胱氨酯系列化合物,Na_2Mo_2(μ_2-X)(μ_2-Y)-O_2(cyst)_2(X=Y=O,(Ⅰ);X=O,Y=S,(Ⅱ);X=Y=S,(Ⅲ)),在不同浓度的盐酸溶液中离解的机制,并讨论了不同桥原子对该系列化合物化学稳定性的影响。

In hydrochloric acid, the dimolybdenum (Ⅴ)-cysteine complexes, Na2Mo2O2 (μ2-X)(/2-Y)( cysteine)2,(X=Y=oxygen(Ⅰ);X=oxygen,Y=sulfur(Ⅱ), give an ESR signal at 1.947, the strength of the signal increases with the enhancement of the concentration of hydrochloric acid. The complex (Ⅲ), Na2Mo2O2 (μ2-S)2(systeine)2, gives an analogous signal only in concentrated acid. By comparing the data of magnetic susceptibility and electron spectrum , the dissociation mechanism of the complexes in hydrochloric acid is assumed and the chemical stability of the complexes affected by bridged atoms is also discussed .