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Issue 10, 2012
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Argentophilic interactions in multinuclear Ag complexes of imidazole containing Schiff bases

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Abstract

The reactions of imidazole groups containing Schiff bases, 1,2-bis[(1-methyl-2-imidazolyl)-methyleneamino]ethane (bmimen) and 1,3-bis[(1-methyl-2-imidazolyl)-methyleneamino]propane (bmimpn), with silver salts AgCF3SO3 and AgClO3 were studied. Five new silver complexes, [Ag2(bmimen)2][CF3SO3]2·CH3OH·CH3CN (1), [Ag2(bmimen)2][CF3SO3]2 ·0.5H2O (2), [Ag2(bmimen)2][ClO3]2·CH3OH (3), [Ag3(bmimen)2(μ-CF3SO3)2]2[CF3SO3]4 (4) and [Ag(bmimpn)]n[CF3SO3]n (5), were synthesized and characterized. The Ag⋯Ag distances in compounds 1–5 depend on the length of the alkyl chain separating the imidazole ends of the ligand and the coordination mode of the bmimen and bmimpn. The shortest Ag⋯Ag distance of 2.7842(2) Å was found in 4. Such a short distance indicates a strong argentophilic interaction. Argentophilic interactions exist in each of the dinuclear structures 1–3 (Ag⋯Ag distances are 3.3348(5), 3.1873(3) and 3.0680(2) Å, respectively). The distance depends on crystal packing, which is determined by the counter ion and solvent molecules in the structure. In polymeric structure 5, the longer alkyl chain between the imidazole end units of the ligand pushes the metal centres further apart, the Ag⋯Ag separations being 3.6088(4) and 3.5279(4) Å. The results show that imidazole-based Schiff bases can be used to build multinuclear Ag compounds with variable silver–silver interactions.

Graphical abstract: Argentophilic interactions in multinuclear Ag complexes of imidazole containing Schiff bases

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Publication details

The article was received on 20 Nov 2011, accepted on 22 Feb 2012, published on 03 Apr 2012 and first published online on 03 Apr 2012


Article type: Paper
DOI: 10.1039/C2CE06550A
Citation: CrystEngComm, 2012,14, 3509-3514
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    Argentophilic interactions in multinuclear Ag complexes of imidazole containing Schiff bases

    L. Koskinen, S. Jääskeläinen, L. Oresmaa and M. Haukka, CrystEngComm, 2012, 14, 3509
    DOI: 10.1039/C2CE06550A

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