SYNTHESIS, SPECTROSCOPIC CHARACTERIZATION AND CRYSTAL AND MOLECULAR-STRUCTURE OF TETRAKIS(CARBONYL)(TETRAPHENYLDITHIOIMIDODIPHOSPHINATO) MANGANESE(I), MN(CO)(4)[(SPPH(2))(2)N]

Mn(CO)(4)[(SPPh(2))(2)N] was prepared by allowing [Mn(CO)(5)]Br to react with K[(SPPh(2))(2)N], in THF. The compound was characterized by IR, mass and NMR (H-1, C-13, P-31) spectroscopy, and its crystal and molecular structure was determined by single-crystal X-ray diffraction. The lattice contains two independent, monomeric molecules, (1) and (1a). The metal atom has a distorted octahedral coordination geometry (C-ax-Mn-C-ax 175.9(3)degrees in (1), 176.9(3)degrees in (1a)), with two carbonyl groups and the two sulfur atoms of the symmetric monometallic bidentate (mean P-S 2.021(2) Angstrom in (1), 2.020(2) Angstrom in (1a)) dithio ligand unit in equatorial positions (mean Mn-S 2.420(2), Mn-C-eq 1.804(4), Mn-C-ax 1.855(5) Angstrom in (1), Mn-S 2.417(2), Mn-C-eq 1.78(2), Mn-C-ax 1.862(5) Angstrom in (1a)). The main difference between the two independent molecules is the conformation of the inorganic MnS2P2N chelate ring.