| 摘要 |
Organometallic boron/nitrogen polymers, precursors of boron nitride, include recurring structural units of the formulae (I) and (II): <IMAGE> (I) and <IMAGE> (II) wherein X is N-R3, Y is NR1R2 and Z is N-R, in which R, R1, R2 and R3, which may be identical or different, are each a hydrogen atom, an optionally substituted hydrocarbon radical, or an organosilyl or hydrogenoorganosilyl radical and are prepared by reacting (a) at least one cyclic compound (compound A) containing recurring structural units of the formula (1): <IMAGE> (1) wherein A is a halogen atom and R is a hydrogen atom, an optionally substituted hydrocarbon radical, or an organosilyl or hydrogenoorganosilyl radical, with (b) at least one compound including at least one boron atom to which two halogen atoms are directly bonded (compound B), and (c) at least one compound containing at least one NH2 group compound C); the resulting organometallic polymers are facilely pyrolyzed into boron nitride ceramic materials.
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