Beiträge zur Chemie des Phosphors, 60 Zur Kenntnis des α-Tetraphosphor-trithio-dijodids / Contributions to the Chemistry of Phosphorus, 60 About α-Tetraphosphorus-trithio-diiodide

Abstract

The ‘broad single line’ at —127 ppm (from 85% H3PO4), reported in the literature for the 31P NMR spectrum of α-P4S3J2, could be resolved into 10 lines which form together with also detected outer signals of low intensity an AA′BB′ system with 24 observable lines. Therefore, α-P4S3J2 has the same bicyclic molecular structure 1 in solution as in the solid state. The chemical shifts of the atoms PA and PB, determined by analysis of the spectrum, have the very small difference of 3.68 ppm, which may be caused by an accidental compensation of substituent and ring tension effects. The infrared spectrum of α-P4S3J2 is consistent with formula 1 too.