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Composés d'addition des halogénures de niobium(V) et de tantale(V). VII. Composés du chlorure de niobium(V) avec l'oxytrichlorure et l'oxytribromure de phosphore |
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| Authors: | J C Bünzli A Merbach |
| Abstract: | The adducts NbCl5 · OPCl3 and NbCl5 · OPBr3 are observed in chloroform solution by 31P-NMR spectroscopy. The enthalpy and entropy of activation for the exchange reaction between bulk and coordinated OPCl3 are found equal to 17 ± 3 kcal/mole and 18 ± 10 cal/°mole. The stability of NbCl5 · OPCl3 is compared on a semi-quantitative basis to the stability of other adducts NbCl5 · OPR3 (R = Br, OMe, NMe2). |
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