Schwingungsspektren und Kraftkonstanten des Monothio-, 1,1-Dithio-, 1,2-Dithio- und Trithiooxalat-Ions

The i.r. and Raman spectra of the monothio-, 1,1-dithio-, 1,2-dithio- and trithio-oxalate ion in the solid state and in solution are reported. The fundamentals are assigned on the basis of normal coordinate analyses and of Raman polarisation data. Force constants for identical internal coordinates can be transferred without change within this series. In all ions the carboxylic groups are in a staggered conformation. A possible exception is the monothio-oxalate ion in the barium and lead salt.