Microwave spectrum, molecular structure, and force field of HBO
作者:Yoshiyuki Kawashima、Yasuki Endo、Eizi Hirota
DOI:10.1016/0022-2852(89)90247-6
日期:1989.1
isotopic species were simultaneously analyzed to derive the equilibrium molecularstructure and the harmonic and third-order anharmonic potential constants of the HBO molecule. The equilibrium bond lengths thus obtained are r e (HB) = 1.166 67(41) A and r e (BO) = 1.200 68(10) A , and the substituted, average, and effective structures were also calculated for comparison.
摘要 HBO 分子是在乙硼烷与直流放电引起的氧气反应中作为瞬态中间体产生的。观察到 H 10 BO 的 J = 3 ← 2 跃迁,并与已经报道的光谱相结合,推导出该物种的旋转、离心畸变和核四极耦合常数。还确定了 D 11 BO、D 10 BO、H 11 B 18 O 和 H 10 B 18 O 的旋转和离心畸变常数。测量结果扩展到 H 11 BO 和 H 10 BO 在 ν 1 中的旋转转变、 ν 2 、2 ν 2 和 ν 3 状态以及 D 11 BO 和 D 10 BO 在 ν 2 、2 ν 2 和 ν 3 状态中的那些。振动频率和旋转、振动-旋转、l 型加倍,同时分析由此确定的六种同位素物质的离心畸变常数和离心畸变常数,以推导出平衡分子结构以及 HBO 分子的谐波和三阶非谐波势常数。由此获得的平衡键长为re (HB) = 1.166 67(41) A 和re (BO) = 1.200
Reversible Formation of Organyl(oxo)boranes (RBO) (R = C<sub>6</sub>H<sub>5</sub> or CH<sub>3</sub>) from Boroxins ((RBO)<sub>3</sub>): A Matrix Isolation Study
作者:Holger F. Bettinger
DOI:10.1021/om061057i
日期:2007.12.1
Flash vacuum pyrolysis of triphenyl- and trimethylboroxin and subsequent trapping of the gas phase products in a large excess of argon at T < 20 K allows matrix isolation and characterization by IR spectroscopy of phenyl(oxo)borane and methyl(oxo)borane. The nature of the matrix isolated species, monomeric CH3BO, 1: 1 dimer complex of CH3BO, (CH3BO)(2), and (CH3BO)(3), depends strongly on the trapping temperature and matrix host gas (Ar vs Xe) with the boroxin dominating at 30 K (Ar) or 55 K (Xe). An ab initio investigation (second-order Moller-Plesset perturbation theory) of the potential energy surface for trimerization of CH3BO is in agreement with the experimental observations.