A chemical concept from the science citation index database.
Résumé
Two ternary complexes of Mn(II) indole-2-carboxylate (2-IC) with 2,9-dimethyl-1,10-phenanthroline (NC) and 1,10-phenanthroline (phen) in DMSO or dimethylacetamide (DMA) were synthesized, their x-ray crystal structure and IR spectroscopy characteristics were detd. In MnII(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 revealed a seven-coordinate Mn(II) when a moderately long contact distance Mn-O (DMSO 2.643(2) .ANG.) is included in the coordination list: the Mn(II) configuration can be described as a distorted capped octahedron. Individual mols. are linked into chains running parallel to the a axis by intermol. H bonding. In [MnII(2-IC)2(phen)(H2O)]×DMA (2), the Mn 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 H2O mol., the Mn(II) environment can be described as a very distorted octahedron. The individual mols. are assocd. in dimmer structure by intermol. H bonding. The crystal structure of 2 is completed by a disordered DMA solvate mol. These two complexes are catalysts for the disproportionation of H2O2 in the presence of added imidazole.