Microwave spectrum of borinic acid BH2OH

The microwave spectrum of BH2OH, a transient intermediate in the reaction between diborane and water, has been detected and analyzed. This molecule has also been found in the reaction between diborane and oxygen. The lifetime of BH2OH in a copper waveguide cell is a few seconds, which is much shorter than that of BH(OH)2. The rotational and centrifugal distortion constants have been determined for the 11BH2OH, 10BH2OH, 11BD2OD, and 11BH2 18OH species. From the rotational constants the molecular structure has been determined as r(B–O) = 1.352(4) A, r(O–H) = 0.967(14) A, &BOH = 112.0(17)°, &HcBO = 121.8(8)°, and &HtBO = 117.2(8)°, the r(B–H) = 1.200 A being assumed. For the normal species, the dipole moments have been determined as μa = 0.497(7)D, μb = 1.423(15)D, and μtotal = 1.506 D. The quadrupole coupling constants have also been determined.

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