Abstract
The reactions between trans-[Mo(N2)2(depe)2][depe = 1,2-bis(diethylphosphino)ethane] and hydrogen chloride in tetrahydrofuran have been studied. The initial reaction involves rapid formation of the isolable [MoH(N2)2(depe)2]+[k1, =(2.7 ± 0.2)× 103 dm3 mol–1 s–1]. Subsequent rate-limiting dinitrogen loss [k2=(4.5 ± 0.4)× 10–4 s–1] results, at low concentrations of acid ([HCl] < ca. 0.3 mol dm–3), in the predominant formation of [MoH2Cl2(depe)2]. At higher concentrations of acid the major product is trans-[Mo(NNH2)Cl(depe)2]+. Discrimination between the two products occurs after the rate-limiting loss of dinitrogen. Detailed analysis shows that the two products are formed, at various concentrations of hydrogen chloride, according to the expression [Mo(NNH2)Cl(depe)2+]/[MoH2Cl2(depe)2]= 8.0[HCl]2.
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