THE HIGH-RESOLUTION INFRARED SPECTRUM OF DIBORANE
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Date
1997
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Publisher
Ohio State University
Abstract
We are in the process of recording and analyzing of the infrared active bands of $B_{2} H_{6}$, the simplest of the hydrogen-bridged borane compounds, with the goal of determining the frequencies of the 1R forbidden modes in this very symmetric ($D_{2h}$) molecule by means of anharmonic intersctions. The spectra were obtained on a Bruker 120HR FT spectrometer with a spectral resolution of 0.002 $cm^{-1}$. The sample contained boron iv natural abundance ($\sim 80% ^{11}B; 20% ^{10}B$) and, therefore. The abundance of $^{11}B_{2}H_{6}$, and $^{11}B_{2}H_{6}$ was 64%, 32% and 4% respectively. With the resolution available the spectra of the: two most abundant isotopomers were readily assignable. At this point, the $\nu_{14}$ (c-type) and $\nu_{17}$ (a-type) bands have been assigned for both the $^{11}B_{2}H_{6}$ and $^{11}B^{10}BH_{6}$ isotopic species and ground state and upper state constants obtained. Both bands exhibit small perturbations. A mixed $r_{3}-r_{0}$ structure for diborane has been obtained.
Description
Author Institution: Pacific Northwest National Laboratory; Lab. Photophysique Moleculaire, CNRS, Universite Paris-Sud; Optical Physics Division, Instituto de Estructura de la Materia