Abstract
CRYSTAL structure determinations have shown that although the co-ordination of the metal in molecules of bisacetylacetonatocopper(II)1, NN′-ethylenebis(acetylacetoneiminato)copper(II)2 and bissalicylaldehydatocopper-(II)3 is essentially square planar the molecules pack such that there is an axial approach (that is, perpendicular to the co-ordination square) of 3.1–3.4 Å from the copper to a conjugated region of an adjacent molecule. Whereas such an intermolecular approach is not abnormally short it is accompanied by a distinct distortion of the molecules from their expected shape, clearly indicating that there is an interaction between them. It has been suggested that these are examples of polarization bonding, the π-bond system acting as an electron donor and the copper atom as acceptor2.
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References
Piper, T. S., and Belford, R. L., Mol. Phys., 5, 169 (1963).
Hall, D., Rae, A. D., and Waters, T. N., Proc. Chem. Soc., 143 (1962).
McKinnon, A. J., Water, T. N., and Hall, D. (to be published).
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HALL, D., MCKINNON, A., WATERS, J. et al. Presence of Polarization Bonds in some Copper (II) Complexes. Nature 201, 607 (1964). https://doi.org/10.1038/201607a0
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DOI: https://doi.org/10.1038/201607a0
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