FORMATION OF POLYNUCLEAR CADMIUM-THIOLATE COMPLEXES AND CDS CLUSTERS IN AQUEOUS-SOLUTION STUDIED BY MEANS OF STOPPED-FLOW AND NMR SPECTROSCOPIES

被引：51
作者：
NOSAKA, Y
SHIGENO, H
IKEUCHI, T
机构：
[1] Department of Chemistry, Nagaoka University of Technology, Nagaoka, Niigata
来源：
JOURNAL OF PHYSICAL CHEMISTRY | 1995年 / 99卷 / 20期
关键词：
D O I：
10.1021/j100020a066
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Formation processes of CdS ultrasmall particles from cadmium complexes of 2-mercaptoethanol (RSH) were investigated by means of stopped-flow and NMR spectroscopies. Two different initial processes depending on the amount of RS(-) ions have been found. The presence of S-4-Cd-10(SR)(12) clusters in solution was observed by NMR spectroscopy. Formation of [S4Cd17(SR)(24)](2+) clusters having a 290-nm absorption peak was suggested. The correlation between the absorption peak and the diameter for polynuclear Cd2+-SR(-) complexes is expressed with the finite-depth quantum well model for ultrasmall particles. Electronic interaction between the capping agent and particle framework was suggested on the basis of the differences observed in the absorption wavelengths of the CdS-RSH clusters and the corresponding CdS-thiophenol clusters.
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页码：8317 / 8322
页数：6
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