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Abstract : |
The interaction of gold(I) thiomalate [(Autm)n] and gold(I) thioglucose [(Autg)(n)] with thiourea (Tu) has been studied using C-13 and N-15 NMR spectroscopy. It is observed that thiourea binds to Autm), to form a ternary complex, Tu-Au-tm. An upfield shift of 2.6ppm in the >C=S resonance of Tu in C-13 NMR and a downfield shift of 1.0 ppm in N-15 NMR are indicative of gold(l) binding with Tu through sulfur only. In the case of (Autg),, the >C=S resonance of Tu remains unchanged. throughout the titration, suggesting that Tu could not break the (Autg)(n) polymer completely. Imidazolidine-2-thione (Imt) also shows a weak interaction towards (Autg)(n), similar to that of Tu., |
