Electron-spin-resonance (ESR) spectroscopy has been applied to vanadium, niobium (and tantalum) complexes
with N2 and CO in the corresponding pure solid matrixes at 4 K. Except for V(CO)6, none has previously
been studied by ESR. For these d,
S = 1/2, radicals, g values and hyperfine parameters (51V, 93Nb nuclei) are
obtained and interpreted in terms of axial molecules, distorted from octahedral symmetry by Jahn−Teller
effects. There are significant differences with previous work, and the new metal hyperfine data in the two
types of complexes are informative.
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