Synthesis, crystal structure and IR spectroscopy of MnII(2-IC)2(NC)(DMSO) and [MnII(2-IC)2(phen)(H2O)]•DMA;: (2-HIC, indole-2-carboxylic acid;: phen, 1,10-phenanthroline; NC, 2,9-dimethyl-1,10-phenanthroline; DMSO, dimethyl sulfoxide; DMA, dimethyl acetamide);: catalysts for the disproportionation of hydrogen peroxide

Two ternary complexes of manganese(II) indole-2-carboxylate (2-IC) with 2,9-dimethyl-1,10-phenanthroline (NC) and 1,10-phenanthroline (phen) in dimethyl sulfoxide (DMSO) or dimethylacetamide (DMA) were synthesized, their X-ray crystal structure and IR spectroscopy characteristics were determined. In compound Mn-II(2-IC)(2)(NC)(DMSO) (1), Mn(II) is six-coordinate by one bidentate NC ligand and two bidentate 2-IC anionic ligands. The crystal structure has revealed a seven-coordinate Mn(II) when a moderately long contact distance Mn-O (DMSO 2.643(2) Angstrom) is included in the coordination list: the Mn(II) configuration can be described as a distorted capped octahedron. Individual molecules are linked into chains running parallel to the a axis by intermolecular hydrogen bonding. In compound Mn-II(2-IC)(phen)(H2O)] . DMA (2), the manganese atom is six-coordinate by one bidentate phen ligand and two 2-IC anionic ligands one of which is monodentate, and the other is bidentate. The coordination sphere is completed by one water molecule, the Mn(II) environment can be described as a very distorted octahedron. The individual molecules are associated in dimmer structure by intermolecular hydrogen bonding. The crystal structure of 2 is completed by a disordered DMA solvate molecule. These two complexes are catalysts for the disproportionation of H2O2 in the presence of added imidazole. (C) 2003 Elsevier Science Ltd. All rights reserved.