The chemistry of niobium and tantalum dithiocarbamato-complexes. Part 3. Protonation of [Nb(NNMeR)(S2CNEt2)3](R = Me or Ph)
作者:Richard A. Henderson、Kay E. Oglieve
DOI:10.1039/dt9900001093
日期:——
decomposition of this species to yield the products. The sites of protonation of the hydrazide residue have been established by comparison of the rates of protonation of the species with methyl or phenyl substituents. The introduction of methanol into these systems inhibits the rate of protonation due to specific solvation of the monoprotonated complex.
The chemistry of niobium and tantalum dithiocarbamato-complexes. Part 5. The kinetics and mechanism of the hydrazine-forming reactions between [{M(S<sub>2</sub>CNEt<sub>2</sub>)<sub>3</sub>}<sub>2</sub>(µ-N<sub>2</sub>)](M = Nb or Ta) and acid: rate-limiting protonation
作者:Richard A. Henderson、Susan H. Morgan、Alan N. Stephens
DOI:10.1039/dt9900001101
日期:——
cases the multistep mechanism involves rate-limiting protonation of the bridging dinitrogen atoms, and in one case (M = Ta) the monoprotonated species [Ta(S2CNEt2)3}2(µ-N2H)]+ was detected spectrophotometrically. The cleavage of the metal–nitrogen bond occurs after the addition of at least two protons. The factors influencing the rates of protonation of bridging and end-on co-ordinated dinitrogen molecules