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Issue 16, 2011
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Transition metal complexes of the novel hexadentate ligand 1,4-bis(di(N-methylimidazol-2-yl)methyl)phthalazine

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Abstract

The novel polydentate ligand 1,4-bis(di(N-methylimidazol-2-yl)methyl)phthalazine, bimptz, has been synthesized and its coordination chemistry was investigated. Bimptz is neutral and contains a central phthalazine unit, to which two di-(N-methylimidazol-2-yl)methyl groups are attached in the 1,4-positions. This ligand therefore provides up to 6 donor sites for coordination to metal ions. A series of metal complexes of bimptz was prepared and their molecular structures were determined by X-ray diffraction. Upon reaction of bimptz with two equivalents of MnCl2·4H2O, CoCl2·6H2O and [Ru(dmso)4Cl2], the dinuclear complexes [Mn2(bimptz)(µ-Cl)2Cl2] (1), [Co2(bimptz)(CH3OH)2(µ-Cl)2](PF6)2 (3) and [Ru2(bimptz)(dmso)2(µ-Cl)2](PF6)2 (4), respectively, were isolated. The latter were found to have similar solid state structures with octahedrally coordinated metal centers bridged by the phthalazine unit and two chloro ligands. The cobalt and ruthenium complexes 3 and 4 were isolated as PF6 salts and contain neutral methanol and dmso ligands, respectively, at the terminal coordination sites of the metal centres. The mononuclear ruthenium complex [Ru(Hbimptz)2](PF6)4 (6) was obtained from the reaction of two equivalents bimptz with [Ru(dmso)4Cl2]. In complex 6, three donor sites per ligand molecule are used for coordination of the Ru(II) center. In each bimptz ligand, one of the remaining, dangling N-methylimidazole rings is protonated and forms a hydrogen bond with the unprotonated N-methylimidazole ring of the other bimptz ligand.

Graphical abstract: Transition metal complexes of the novel hexadentate ligand 1,4-bis(di(N-methylimidazol-2-yl)methyl)phthalazine

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Publication details

The article was received on 17 Oct 2010, accepted on 18 Feb 2011 and first published on 16 Mar 2011


Article type: Paper
DOI: 10.1039/C0DT01406K
Citation: Dalton Trans., 2011,40, 4315-4323
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    Transition metal complexes of the novel hexadentate ligand 1,4-bis(di(N-methylimidazol-2-yl)methyl)phthalazine

    S. Roggan, C. Limberg, C. Knispel and T. D. Tilley, Dalton Trans., 2011, 40, 4315
    DOI: 10.1039/C0DT01406K

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