Electron spin resonance spectrum of tetrakis(diethylamino)vanadium(IV)

Abstract

The e.s.r. spectrum of V(NEt₂)₄ dissolved in Ti(NEt₂)₄, pentane, hexane, benzene, and cyclohexane, has been determined in the temperature range 20 to –150°. There is a slight variation of the g and A values in the various frozen glasses. The values g_∥= 1·949, g_⊥= 1·986, A_∥= 0·0123 cm.^–1 and A_⊥= 0·0026 cm^–1, obtained from the glass in Ti(NEt₂)₄, in conjunction with spectral measurements, have been interpreted in terms of an MO scheme for the molecule. This treatment has been compared with a similar one for V(OBu^t)₄. The major difference being a considerably greater degree of ligand participation in the molecular orbital involving the metal d_xy orbital in the dialkylamino-derivative compared with the t-butoxy-compound.