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31 P NMR data of sixteen molecules in the series P 4 S x Se 3-x  (x = 0 - 3), PyAs 4-y S 3 , and P y As 4-y Se 3  (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 P 4 S 3 .

31 P-NMR-spektroskopische Untersuchungen an A 4 B 3 -Molekülen/ 31 P NMR Spectroscopical Investigations of A 4 B 3 Molecules