Gas Phase Synthesis, Structure, and Dissociation of Boron Triazide
作者:R. L. Mulinax、G. S. Okin、R. D. Coombe
DOI:10.1021/j100017a007
日期:1995.4
Gas phase B(N-3)(3) is readily prepared by a spontaneous room temperature reaction between HN3 and BCl3. The infrared spectrum of the reaction products exhibits strong absorptions at 2163 and 1360 cm(-1) and a weaker absorption near 1100 cm(-1). These features are assigned to B(N-3)(3) by comparison with-results from ab initio calculations of the geometry and vibrational frequencies of the molecule. B(N-3)(3) has a strong UV absorption at 230 nm, with sigma(230) = 1.3 x 10(-17) Cm-2. The density of gaseous B(N-3)(3) prepared in these experiments decays with a time constant near 30 min. This decay is attributed to dissociation at the vessel walls, a process which leaves a visible film. Infrared spectra of films produced by either room temperature dissociation or UV photodissociation of B(N-3)(3) exhibit features attributable to BN, likely in the presence of excess nitrogen.
Generation of NNBN via Photolysis of B(N<sub>3</sub>)<sub>3</sub> in Low-Temperature Argon Matrices: IR Spectra and ab Initio Calculations
作者:Ismail A. Al-Jihad、Bing Liu、Christopher J. Linnen、Julanna V. Gilbert
DOI:10.1021/jp9812684
日期:1998.7.1
B(N-3)(3) was isolated in a low-temperature argon matrix and its FTIR spectrum measured. The spectrum was consistent with the known gas-phase spectrum, and splitting due to the natural abundances of B-10 and B-11 was observed. Upon UV photolysis, new peaks at 2100, 1861, and 1803 cm(-1) assigned to the linear molecule NNBN appeared as the B(N-3)(3) peaks decayed. Geometry optimizations and calculations of the ground-state frequencies for B-10 and B-11 isotopomers B(N3)3 [MP2/6-31G(d)] and NNBN [CCSD(T)/6-311G"] are reported, and the frequencies are compared to those observed in the IR spectra. The photolytic decomposition mechanism of B(N-3)(3) is discussed.