Evidence for an unexpected chiral axis in tetraethyldithiooxamide and in its platinum(II) coordination and organometallic complexes.

Abstract

Abstract Tetraethyldithioxamide (Et 4 -DTO) shows in solution high energy barriers either for chiral torsion around CC axis or for achiral torsion around CN axis. A chiral CC axis was also evidenced by a crystal structure determination on a single crystal, which showed clearly the right absolute configuration in the P4 3 space group. 1 H-NMR signals of the prochiral probe -C 2 H 5 in Et 4 -DTO provided unequivocal evidence for the persistence of the chiral CC axis also in co-ordination and organometallic complexes of platinum(II) of the chelate ligand Et 4 -DTO.