The diethylamido-niobium and -tantalum fluorides, MF4NEt2 and MF3(NEt2)2 are formed from the pentafluorides and Me3SiNEt2 at 20 °C. They are weaker Lewis acids than the pentafluorides and are thought to be fluoro-bridged polymers from their i.r. spectra. Niobium pentafluoride reacts with Me3SiCl in Et2O to give labile niobium chlorofluoride species and finally NbCl5, OEt2.
J. C. Fuggle, D. W. A. Sharp and J. M. Winfield, J. Chem. Soc., Dalton Trans., 1972, 1766 DOI: 10.1039/DT9720001766
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