Abstract
19F NMR and i.r. spectroscopy were employed to study complex formation of niobium and tantalum pentafluorides with triphenylphosphine oxide, ethyl diphenylphosphinate and S-ethyl diphenylthiophosphinate in methylene chloride and in acetonitrile. In methylene chloride solution MF 5L, M 2F IOL, MF 4L 2 + and M 2F II − complexes were found (M=Nb, Ta;L- phosphoryl-containing Ligand). I.r. frequencies are assigned. Solvent properties (electric conductivity and donor capacity) affect the relative stability of complexes. The dependence of 19F NMR parameters on the donor capacity of the ligands is discussed.
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