Stereochemical nonrigidity of the square complex (PPh3)2Pt(HgGePh3)(GePh3) |
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| Authors: | YuK Grishin VA Roznyatovsky YuA Ustynyuk SN Titova GA Domrachev GA Razuvaev |
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| Institution: | Department of Chemistry, Moscow State University, Moscow 117234, U.S.S.R.;Institute of Chemistry, Academy of Science of the U.S.S.R., Gorky, U.S.S.R. |
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| Abstract: | 31P, 195Pt and 199Hg NMR spectra of complex (PPh3)2Pt(HgGePh3)(GePh3) (I) have been studied. The spectra at temperatures below ?40°C prove that (I) is a cis-isomer with the square-planar coordination of the Pt atom. The reversibility of temperature dependences of spectra, insensitivity of line shape to the solvent, concentration and presence of free phosphine establish the fluxional behaviour of (I). The activation parameters of the intramolecular rearrangement which is realized, most probably, through a digonal twist, are: Δ≠298 = 51.5 ± 2.9 kJ/mol, ΔH≠ = 59.3 ± 2.9 kJ/mol, ΔS≠ = 26.2 ± 9.7 J/mol. K. |
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| Keywords: | Author to whom correspondence should be addressed |
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