Far infrared spectroscopy of complexes of copper(I) halides with phosphine and amine ligands |
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Affiliation: | 1. Department of Chemistry, University of Auckland, Private bag, Auckland, New Zealand;2. School of Science, Griffith University, Nathan, Queensland 4111, Australia;3. Department of Physical and Inorganic Chemistry, University of Western Australia, Nedlands, Western Australia 6009, Australia;1. Department of Chemistry, Islamic Azad University, Central Tehran Branch, Poonak, Tehran, Iran;2. School of Natural Sciences (Chemistry), University of Tasmania, Private Bag 75, Hobart, TAS, 7001, Australia;1. School of Marine Science and Engineering, Hebei University of Technology, Tianjin, 300130, China;2. School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, China;3. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China |
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Abstract: | Far i.r. spectra are reported for 34 adducts of phosphine and amine bases with copper (I) halides in which the copper atom is coordinated to only one terminal halide. CuX stretching frequencies are assigned for all of the chloro complexes and for most of the bromo and iodo complexes. The CuX stretching frequencies have been found to depend primarily on the CuX̵ bond length, and appear to be relatively independent of the nature of the coordinating ligands. Best fit curves to the experimental data correspond to a dependence of ν(CuX) on the inverse nth power of r(CuX), where n is approximately equal to 5. Metal—halogen bond stretching force constants have been calculated for copper(I) and related silver(I) and gold(I) halide complexes assuming that the MX entity behaves as an uncoupled diatomic molecule. The results show that for three-coordinate copper(I) the force constants decrease in the order CuCl>CuBr>CuI and that the same trend is shown for four-coordinate copper(I) complexes, but the differences are considerably smaller than for the three-coordinate case. Analogous trends are found for the two- and three-coordinate gold compounds. |
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