Preparation and Characterization of Cobalt(III) Complexes with S,S-Bridge R,S-Sexidentate-N2,S2,O2 Type Ligands. Crystal Structure of (+)560CD-((2R,9S)-Diamino-3,3,8,8-tetramethyl-4,7-dithia-1,10-decanedioato)cobalt(III) Ion