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- W2081923330 abstract "Abstract 13C nmr spectra of the complexes cis-[Rh(CO))2(pyO)(X)] (X = Cl, Br; pyO = pyridine N-oxide) are discussed. Variable temperature 13C nmr spectroscopy has been used to monitor the exchange process occurring in acetone-d 6 solution. Rate constants for the exchange reaction have been determined by complete band shape analysis. The enthalpy of activation for the chloro- and bromo-complexes was found to be 53.3 ± 1.0 kJ mol−1 and 48.3 ± 0.8 kJ mol−1 respectively. The entropy of activation was found to be 5.5 ± 0.6 J mol−1 K−1 and -11.0 ± 0.3 J mol−1 K−1, for the chloro- and bromo-complexes, respectively. It is suggested that the fluxionality of the molecules results from an intermolecular exchange of pyridine N-oxide rather than from loss of carbon monoxide. A mechanism for the exchange process is proposed. Key Words: Nmrrhodium(I)pyridine N-oxidecarbonylfluxionalityrate constants" @default.
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- W2081923330 date "1993-09-01" @default.
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- W2081923330 title "NMR EXCHANGE STUDIES ON THE COMPLEXES <i>cis</i>-[Rh(CO)<sub>2</sub>(pyridine <i>N</i>-oxide)(X)] (X = Cl, Br)" @default.
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- W2081923330 doi "https://doi.org/10.1080/00958979308022747" @default.
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