Substitution Reactions of A₄B₃X₂-Compounds (A=P; B=S,Se; X=I,Br,Cl)

Abstract

Mixed halido compounds of the general formula P₄B₃XY (B=S, Se; X,Y=I, Br, Cl) have been synthesized by reaction of P₄B₃X₂ molecules with bismuth- or mercury halides in CS, solution. ³¹P-n.m.r. spectra have been measured and assigned. Predictive relationships were found between n.m.r. parameters for unsymmetric molecules and those for the symmetric ones, showing that the molecules can be composed from parts of the pure P₄B₃X₂(Y₂) compounds.