Models and polyborazine precursors for boron nitride ceramics

• Published in: Chemistry of materials 1990-07, Vol.2 (4), p.377-384
• Main Authors: Narula, Chaitanya K, Lindquist, David A, Fan, Mao Min, Borek, Theodore T, Duesler, Eileen N, Datye, Abhaya K, Schaeffer, Riley, Paine, Robert T
• Format: Article
• Language: English
• Subjects: 360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies; BORON COMPOUNDS; BORON NITRIDES; CERAMICS; COHERENT SCATTERING; CRYSTAL STRUCTURE; DATA; DATA ANALYSIS; DIFFRACTION; EXPERIMENTAL DATA; INFORMATION; MATERIALS SCIENCE; MEASURING INSTRUMENTS; MEASURING METHODS; NITRIDES; NITROGEN COMPOUNDS; NUMERICAL DATA; PNICTIDES; PRECURSOR; SCATTERING; X-RAY DIFFRACTION
• ISSN: 0897-4756; 1520-5002
• DOI: 10.1021/cm00010a013

Elimination-condensation reactions between Me(Cl{sub 2})B{sub 3}N{sub 3}Me{sub 3} and (Me{sub 3}Si){sub 2}NMe and between (ClBNMe){sub 3} and (Me{sub 3}Si){sub 2}NH form oligomeric borazinylamines, and a metathesis reaction between Li{sub 2}S and (ClBNH){sub 3} produces an oligomeric borazinyl sulfide. The pyrolysis chemistry of these oligomers has been examined, and conditions have been defined that produce hexagonal h-BN. Reactions that model the first stage of oligomer formation also have been studied, and the molecular species (Me{sub 3}N{sub 3}B{sub 3}(Me{sub 2})){sub 2}NH, (Me{sub 3}N{sub 3}B{sub 3}(Me{sub 2})){sub 2}NMe, (Me{sub 3}N{sub 3}B{sub 3}(Me{sub 2})){sub 2}S, and (Me{sub 3}N{sub 3}B{sub 3}(Me{sub 2})){sub 2}O have been isolated and characterized. Single-crystal x-ray diffraction analyses for these compounds have been completed.