Synthesis and characterization of poly(aminoborane) as a new boron nitride precursor

Abstract

During the solution reaction of NaBH4/(NH4)2SO4 in tetraglyme to form borazine, polymeric aminoborane (NH2BH2)x has been isolated as a white powder. The powder was characterized by thermal gravimetric analysis/differential scanning calorimetry, infrared and mass spectroscopies, and powder X‐ray diffraction. Solid‐state 15N and 11B nuclear magnetic resonance firmly proved that the chain‐like poly(aminoborane) evolved a partially condensed B3N3 ring structure by dehydrogenative condensation between chains at 200 °C. Pyrolysis of the polymer in a nitrogen stream up to 1400 °C led to a 75% yield of hexagonal boron nitride with an interlayer spacing of 3.37 Å. Copyright © 1999 John Wiley & Sons, Ltd.

Hydrogen storage of metal nitrides by a mechanochemical reaction

“…The N-H and B-H stretching modes shift to higher energy compared with borane-ammonia complex (NH 3 BH 3 , N-H: 3302 cm −1 , B-H: 2313 cm −1 ). Another distinct difference of ball-milled BN and NH 3 BH 3 was observed in the B-N stretch with a strong peak at 1326 cm −1 for the ball-milled h-BN and a slight peak at 1374 cm −1 for NH 3 BH 3 [33]. The B-N absorption of ball-milled B-N resembles that of BN (1279 cm −1 ).…”

“…The B-N absorption of ball-milled B-N resembles that of BN (1279 cm −1 ). In addition, out of plane B-N-B absorption at 784, 757 cm −1 of ball-milled h-BN and h-BN indicates the presence of B 3 N 3 ring structure [33]. To interpret the hydride reaction, it is convenient to describe the N-H and B-H stretching vibrations in terms of addition reaction of H 2 at the edge of the h-BN produced by mechanical milling in a H 2 atmosphere as indicated in Fig.…”

Nanostructured and architectured boron nitride from boron, nitrogen and hydrogen-containing molecular and polymeric precursors

“…During the solution reaction of NaBH 4 with (NH 4 ) 2 SO 4 in tetraglyme to form BZ, PAB has been isolated as a white powdered co-product [38]. PAB can also be formed by subjecting borazine vapor to a radio Materials Today Volume 17, Number 9 November 2014 RESEARCH…”

Efficient curing of polymethylsilane by borazine and reaction mechanism study

“…Hexane as a solvent was purified by distillation with sodium. The transparent colorless borazine liquid was synthesized by using a modification of Sneddon's procedure, as described in our previous reports [17,37,40,41]. Oily white PMS was synthesized by the Wü rtz condensation of dichloromethylsilane with sodium, as previously reported [17].…”