Electronic wavefunctions and solution nuclear magnetic resonance parameters of some mixed fluorochloro-osmates(IV)

Abstract

The ¹⁹F n.m.r. chemical shifts and spin–spin splitting parameters of some mixed fluorochloro-osmates(IV) have been measured in solution in various solvents and over a range of temperatures. The measured values have been analysed in terms of the electronic wavefunctions expected for the complexes. The analysis is facilitated by the preponderant effect of the first excited electronic state on their magnetic properties. Line broadening of ¹⁹F n.m.r. resonances by trans but not by cis Cl atoms can thus be explained by electronic effects rather than interpositional exchange of the fluorine nuclei.