Reactivity of boron-, nitrogen-, and hydrogen-containing precursors of boron nitride. Part I. Thermal decomposition of complexes between aluminum hydrotriborate and hydrazine

The kinetics of thermolysis of complexes between Al(BH4)(3) and hydrazine t aken in the mole ratio of [Al(BH4)(3):[N2H4]=1:1 and 1:3 is studied at 85-1 80 degrees C. Their thermal conversion involves a multi-stage process of de hydrogenation, each stage having its own effective rate constant differing dramatically from the others. IR-spectrum analysis of the initial compounds and solid-phase end-products of thermolysis has revealed that the donor-ac ceptor B<--N bonds formed in the initial complexes change to covalent in th e course of dehydrogenation to form boron-nitrogen-hydrogen structures. The plausible routes of conversion of Al(BH4)(3) complexes with hydrazine are considered.