Bonding in d10 transition metal complexes. II. Infrared, Raman, and N.Q.R. studies of some iodocuprate(I) complexes

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Abstract
The infrared and Raman spectra of a number of iodocuprate(I) complexes have been studied. None of the solid complexes studied appears to contain the discrete diiodocuprate(I), CuI2-, or triiododicuprate(I), Cu2I3-, ions which have previously been reported in solution studies, but bright yellow compounds which may contain the hexaiodotetracuprate(I) ion, Cu4I62-, have been prepared with methyltriphenylphosphonium and methyltriphenylarsonium cations. A structure based on a tetrahedron is proposed for the Cu4I62- ion, the copper atoms lying at the corners, and the iodine atoms bridging the copper atoms and lying along the edges of the tetrahedron. The evidence for this structure, and the information concerning the bonding in the ion obtainable from the vibrational and n.q.r. (63Cu, 65Cu, 127I) spectra are discussed.

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