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Y. Kawashima, H. Takeo, M. Sugie, C. Matsumura and E. Hirota
[J. Chem. Phys., Vol. 99, p. 820, 1993]
The microwave spectrum of BH_{2}Cl existing as an intermediate in the reaction between diborane and boron trichloride was observed. The lifetime of this molecule in a brass waveguide cell was found to be less than 1 s. The observed spectrum indicated the molecule to be planar with C_{2v} symmetry. The rotational constants were determined for ^{11}BH_{2}^{35}Cl, ^{11}BH_{2}^{37}Cl, ^{10}BH_{2}^{35}Cl, and ^{11}BD_{2}^{35}Cl, and were employed to calculate the structure parameters (r_{s}):r(B-H)=1.1916(2) Å, r(B-Cl) =1.7353 (5) Å, and ∠HBH=124.22 (3)° The quadrupole coupling constants of Cl, an extraordinarily small χ_{zz} and a large η compared to related molecules, were obtained. The dipole moment was determined to be µ_{a}=0.75 (5) D for BH_{2}Cl.