Pyrolytic conversion of an AlSiNC precursor prepared via hydrosilylation between [Me(H)SiNH] 4 and [HAlN(allyl)] m [HAlN(ethyl)] n

An iminoalane‐silazane polymer (ISP), an AlSiNC precursor, has been synthesized via Pt‐catalyzed hydrosilylation between poly(allyl iminoalane‐ co ‐ethyl iminoalane) {[HAlN(allyl)] m [HAlN (ethyl)] n , AE‐alane} and 1,3,5,7‐tetrahydro‐1,3,5,7‐tetramethylcyclotetrasilazane {[Me(H)SiNH] 4 , TCS}. The IR and 1 H NMR spectra of ISP indicate that the relative amounts of the allyl groups decrease slightly in comparison with those of AE‐alane, suggesting that hydrosilylation occurs partially. TG analysis up to 900 °C reveals that the ceramic yield of ISP is 83.1 mass%. It is suggested that the high ceramic yield can be ascribed to cross‐linking reactions occurring during pyrolysis. Possible reactions during pyrolysis are hydrosilylation, polymerization of the CC bonds in the allyl groups and dehydrocoupling among the SiH groups, NH groups and AlH groups in ISP. The pyrolyzed residue at 1700 °C contains crystalline AlN, 2H ‐SiC, β‐SiC and β‐Si 3 N 4 and amorphous carbon, as revealed by solid‐state nuclear magnetic resonance (NMR) spectroscopy, Raman spectroscopy and X‐ray diffraction (XRD) analysis. Copyright © 2006 John Wiley & Sons, Ltd.