Structure and characterization of tris(4-morpholinedithiocarbamato-S,S′)cobalt(·)acetonitrile solvate complex: [Co(S2CNC4H8O)3]·CH3CN

The crystal and molecular structure of the complex [Co(S₂CNC₄H₈O)₃]·CH₃CN has been determined by X-ray crystallography. The compound crystallizes in the triclinic system, space group P\overline 1 , with lattice parameters a = 10.561(2), b = 11.114(2), c = 13.011(3) Å, = 103.88(3), = 101.58(3), = 114.91(1)°, and Z = 2. X-ray analysis reveals that the cobalt(III) atom is located at the apparent intersection of D ₃ symmetry. Despite the apparent presence of the rotational axes, all of the atoms in the structure were found to be unique; there are no symmetry-related atoms. The central cobalt atom is octahedrally coordinated by an arrangement of six S atoms. The octahedron is distorted as a result of the forced configuration of the four-membered chelate ring. The average Co–S distance is 2.273 Å. The FT-IR spectra clearly show there are acetonitrile molecules in the crystal lattice.     

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Synthesis and crystal structure of a new dinuclear manganese(II) complex of a macrocyclic ligand with multi-ligating pendant-arms

A new dinuclear manganese(II) macrocyclic complex has been synthesized by [2 + 2] Schiff-base condensation between sodium 2,6-diformyl-4-chlorophenolate with the reduced 1:1 Schiff base of tris(2-aminoethyl)amine (tren) and 2-acetylpyridine in the presence of Mn(ClO₄)₂ · 6H₂O. The crystal structure shows that each pendant-arm is bonded in a bidentate fashion to the adjacent metal atom and that both arms are on the same side of the macrocycle. One manganese(II) ion is seven-coordinate with a geometry of a capped distorted octahedron, while another manganese(II) ion is six-coordinate with a geometry of a distorted octahedron.