Journal of the Chemical Society, Dalton Transactions p. 469 - 474 (1984)
Update date:2022-08-03
Topics:
Donovan-Mtunzi, Susan
Richards, Raymond L.
Mason, Joan
Nitrogen-15 chemical shifts and coupling constants are reported for terminal dinitrogen complexes of Mo, W, Re, Fe, Ru, Os, and Rh.The nitrogen shielding shows a periodic variation with the central metal, increasing with increasing atomic number of the metal across the transition-metal series, or down a particular group, the increase being stepper for the metal-bound nitrogen Nα than for Nβ.For complexes of metals later in the series Nα is more shielded than is Nβ, but there appears to be a crossover at molybdenum, and possibly at or near tungsten.The (15)N shifts show evidence of interaction of adjacent dinitrogen ligands.The majority of compounds have phosphine co-ligands and their (31)P chemical shifts show a smaller sensitivity to change of the central metal (about half to three-quarters of that of the (15)N shifts) and also show chelate effects.The preparation, n.m.r. and redox properties of the new complexes trans-
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