Microwave Spectrum of Dichloroborane (BHCl₂)

M. Sugie, H. Takeo, and C. Matsumura
[Spectrochimica Acta, Vol.50A, No.8/9, pp.1379-1387, 1994]

The microwave spectrum of dichloroborane has been observed and the rotational constants of four isotopic species are determined as follows: A=46911.09(7), B=3185.937(10) and C=2980.425(14) MHz for the normal species, A=46747.14(8), B=3099.543(14) and C=2904.037(14) MHz for BHCl³⁷Cl, A=49302.05(24), B=3185.536(32) and C=2989.368(51) MHz for ¹⁰BHCl₂ and A=35153.18(9), B=3186.026(15) and C=2918.233(11) MHz for BDCl₂. The following complete r_s structure was determined: r_s(B-H)=1.184(2)Å, r_s(B-Cl)=1.735(2)Å and angleCl-B-Cl=120.4(2)° The hyperfine structure due to the two chlorine and one boron nuclei has been analysed.