PREPARATION AND STRUCTURES OF TETRAMERIC AND DIMERIC MANGANESE CARBONYL-COMPLEXES INCORPORATING THIOSALICYLATO LIGANDS

Orthomanganated N,N-dimethylbenzamide reacts with SO2 to give a tetra- manganese complex Mn-4(thsa)(2)(CO)(16) (thsa=thiosalicylate=2-thioben zoate di-anion) which an X-ray structure determination shows to contai n four Mn(CO)(4) units linked by two triply bridging (S,O,O) thsa liga nds. Another product identified after aerobic work-up was the disulphi de [2-((OOC)-O--)C6H4S-](2). Reaction of thiosalicylic acid with BrMn( CO)(5) in the presence of Et(3)N gave good yields of [Et(3)NH](2)[Mn-2 (thsa)(2)(CO)(6)], the anion of which contains two [Mn(eta(2)-thsa)(CO )(3)](-) units doubly-linked via the S atoms.