31P-NMR-spektroskopische Untersuchungen an A4B3-Molekülen/ 31P NMR Spectroscopical Investigations of A4B3 Molecules

Abstract

Abstract 31P NMR data of sixteen molecules in the series P4SxSe3-x (x = 0 - 3), PyAs4-yS3, and PyAs4-ySe3 (y = 0 - 4), resp., are given. All molecules have a common structure, in which a basal ring of three V b-atom s is connected by three chalcogen atom bridges to an apical V b-atom . The dependence of the data on bond angles and electronegativities is discussed. A linear relationship was found betw een chemical shift and an angle increment I=11.3 (∢ endo - 60°) + 5.5 (∢ exo -103°), which describes the bond angle deviations from the reference molecule P4S3.