Mechanism of the reduction of molecular nitrogen to hydrazine by niobium (iii) hydroxide |
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Authors: | N T Denisov S I Kobeleva A F Shestakov |
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Institution: | (1) Institute of Chemical Physics in Chernogolovka, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation |
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Abstract: | The effect of the concentration of water on the rate of reduction of molecular nitrogen to hydrazine by niobium(iii) hydroxide in alkaline H2O−MeOH and D2O−MeOD mixtures was studied. In both cases, the reaction rate is maximum when H2O]=4 mol L−1, and the inverse isotopic effect (K
D/k
H>1) is observed when H2O]<20 mol L−1. Similar regularity was observed for the reaction of hydrogen elimination. It was found that HD is formed in the H2O−MeOH system in the presence of D2. The conclusion was made that the ratedetermining stage in hydrazine formation is the transfer of a hydride ion to the dinitrogen
molecule coordinated to the binuclear NbIII center. A kinetic scheme satisfactorily explaining the effect of the concentration of water (H2O]=1.5−49.0 mol L−1) on the reaction rate constant was proposed.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1600–1604, September, 1997. |
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Keywords: | molecular nitrogen reduction hydrazine hydroxide ion hydride ion reverse isotopic effect |
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