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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−)

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).
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https://hal.univ-brest.fr/hal-01580500
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Submitted on : Friday, September 1, 2017 - 4:04:15 PM
Last modification on : Wednesday, July 15, 2020 - 10:30:02 AM

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Chahlae Atmani, Fatima Setifi, Samia Benmansour, Smail Triki, Mathieu Marchivie, et al.. New planar polynitrile dianion and its first coordination polymer with unexpected short M⋯M contacts (tcno2−=[(NC)2CC(O)C(CN)2]2−). Inorganic Chemistry Communications, Elsevier, 2008, 11 (8), pp.921 - 924. ⟨10.1016/j.inoche.2008.04.038⟩. ⟨hal-01580500⟩

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