Microwave Determination of the Structure of Borine Carbonyl and of the Nuclear Moments of the Stable Boron Isotopes

Abstract

From measurements on the $J=1\mathrm{}\to 2$ and the $J=2\mathrm{}\to 3$ rotational transitions of borine carbonyl its molecular structure has been determined as follows: $d_{\mathrm{BH}}=1.194A$, $d_{\mathrm{BC}}=1.540A$, $d_{\mathrm{CO}}=1.131A$, and ∠HBH = 113°52′. The moments of inertia (which assume $h={6.624}_2\times {10}^{-27\mathrm{}}$ erg. sec.) in g ${\mathrm{cm}}^2$×${10}^{-40\mathrm{}}$ are: ${93.42}_{66}$ for ${\mathrm{B}}^{10}$ ${\mathrm{H}}_3$ ${\mathrm{C}}^{12}$O, ${96.90}_{92}$ for ${\mathrm{B}}^{11}$ ${\mathrm{H}}_3$ ${\mathrm{C}}^{12}$O, ${111.41}_{13}$ for ${\mathrm{B}}^{10}$ ${\mathrm{D}}_3$ ${\mathrm{C}}^{12}$O, and ${114.35}_{40}$ for ${\mathrm{B}}^{11}$ ${\mathrm{D}}_3$ ${\mathrm{C}}^{12}$O. Nuclear quadrupole couplings determined are 3.36±0.10 mc/sec. for ${\mathrm{B}}^{10}$ and 1.55±0.08 mc/sec. for ${\mathrm{B}}^{11}$. Approximate values of the nuclear quadrupole moments are 0.06×${10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$ for ${\mathrm{B}}^{10}$ and 0.03×${10}^{-24\mathrm{}}$ ${\mathrm{cm}}^2$ for ${\mathrm{B}}^{11}$. The nuclear spin of ${\mathrm{B}}^{10}$ is determined as 3 and that of ${\mathrm{B}}^{11}$ as 3/2.