New planar polynitrile dianion and its first coordination polymer with unexpected short M⋯M contacts (tcno2− = [(NC)2CC(O)C(CN)2]2−)
Graphical abstract
A new planar polynitrile dianion ([tcno]2− = [(NC)2CC(O)C(CN)2]2−) has been synthesized and characterized. Its combination with Cu(II) metal ion led to the coordination complex [Cu(tcno)2(H2O)2], which was characterized as the first example in which this anion acts as a ligand. The monodimensional structure in which the organic dianion acts as a μ3-bridging ligand showed very short Cu⋯Cu contacts (3.644 Å) compared to those reported for several polynitrile metal complexes (>6 Å).
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Acknowledgements
The authors acknowledge the CNRS (Centre National de la Recherche Scientifique), the European Union for financial support (MAGMANet network of excellence and COST Action D35-WG-0011-05) and the Spanish Ministerio de Educación y Ciencia (Projects MAT2004-03849 and CSD 2007-00010 Consolider-Ingenio in Molecular Nanoscience). C.A. thanks the Ministère de l’Education Nationale, de la Recherche et de la Technologie for a PhD grant.
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