New planar polynitrile dianion and its first coordination polymer with unexpected short M⋯M contacts (tcno2−=[(NC)2CC(O)C(CN)2]2−)

Chahlae Atmani; Fatima Setifi; Samia Benmansour; Smail Triki; Mathieu Marchivie; Jean-Yves Salaün; Carlos J. Gómez-García

doi:10.1016/j.inoche.2008.04.038

New planar polynitrile dianion and its first coordination polymer with unexpected short M⋯M contacts (tcno2−=[(NC)2CC(O)C(CN)2]2−)

Chahlae Atmani ¹ Fatima Setifi ^{2, 1} Samia Benmansour ^{1, 3} Smail Triki ¹ Mathieu Marchivie ¹ Jean-Yves Salaün ¹ Carlos J. Gómez-García ³

1 CEMCA - Chimie, Electrochimie Moléculaires et Chimie Analytique

2 Departement de Chimie, Universite Ferhat Abbas, Setif

3 ICMol - Instituto de Ciencia Molecular

Abstract : A new planar polynitrile dianion ([tcno]2− = [(NC)2CC(O)C(CN)2]2−) has been synthesized as its potassium salt, K2[tcno] (1). The crystallization of 1 by the slow evaporation of an aqueous solution at room temperature gave two types of colourless crystals having two different shapes [1-A: fine plates and 1-B: needles] for which the crystal structure determinations showed similar geometries for the polynitrile anion in both the structures. The combination of this novel dianion with Cu(II) led to the coordination complex [Cu(tcno)2(H2O)2] (2), which constitutes the first coordination complex of this dianion. The structure of 2 can be described as a coordination polymer in which the organic dianion acts as a μ3-bridging ligand. Despite the fact that the Cu⋯Cu bridges have a large number of atoms, the Cu⋯Cu distance observed through this ligand is relatively short (Cu⋯Cu 3.644 Å) compared to those reported for several polynitrile metal complexes (>6 Å).

Keywords : Coordination polymer Bridging ligand Planar polynitrile anion Copper(II) complexes

Type de document :

Article dans une revue

Inorganic Chemistry Communications, Elsevier, 2008, 11 (8), pp.921 - 924. 〈10.1016/j.inoche.2008.04.038〉

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Chimie

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New planar polynitrile dianion and its first coordination polymer with unexpected short M⋯M contacts (tcno2−=[(NC)2CC(O)C(CN)2]2−)

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New planar polynitrile dianion and its first coordination polymer with unexpected short M⋯M contacts (tcno2−=[(NC)2CC(O)C(CN)2]2−)

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