Calculation of the electronic structures and the gas-phase heats of formation of BH3,NH3 and BH3,CO
作者:D. R. Armstrong、P. G. Perkins
DOI:10.1039/j19690001044
日期:——
and energies of the two complexes BH3,NH3 and BH3,CO and their donor and acceptor components have been investigated by using basis sets of Gaussian-type atomic orbitals. The calculated heats of formation in the gas-phase of the two complexes are in satisfactory agreement with experimental data. The equilibrium B–N bond length in BH3.NH3 is 1·665 Å and the energy barrier to rotation of the groups around
Predictive schemes for the reactivity of borane carbonyl and the stability of carbonyltrihydroborate anions, BH3C(O)X−
作者:Bernard F. Spielvogel、Andrew T. McPhail、Jimmy A. Knight、Charles G. Moreland、Catherine L. Gatchell、Karen W. Morse
DOI:10.1016/s0277-5387(00)84397-1
日期:1983.1
The reactivity of boranecarbonyl (BH3CO) and its isoelectronic counterpart the acetylium cation (CH3CO+) are compared resulting in the formulation of (carbonyl)trihydroborate anions, BH3C(O)X−, which are isoelectronic and isostructural with organic carbonyls. By analogy with the ease of reduction of organic carbonyl compounds by hydroborate, the relative stability towards self-reduction-oxidation
作者:Thomas Onak、Kenneth Gross、James Tse、James Howard
DOI:10.1039/dt9730002633
日期:——
Several derivatives of dimethylenetetraborane are prepared from olefins and B4H8CO, as well as from B4H10. Proton magnetic resonance properties of these cage compounds suggest angle strain at B(2,4) and at the bridging carbons. A method of preparing B4H8CO directly from B2H6 and CO is described.
从烯烃和B 4 H 8 CO以及从B 4 H 10制备二亚甲基四硼烷的几种衍生物。这些笼状化合物的质子磁共振特性表明在B(2,4)和桥碳处的角应变。描述了直接由B 2 H 6和CO制备B 4 H 8 CO的方法。
Evidence for a sequential mechanism in the production of BH from the 193 nm photodissociation of BH3CO
作者:Jane K. Rice、C.H. Douglass、H.H. Nelson
DOI:10.1016/0301-0104(90)85011-k
日期:1990.5
proposed in which BH3CO photodissociates to form BH3. A small percentage of the BH3 species have the internal energy required to further dissociate to BH + H2. The modelling of this mechanism is aided by consideration of the information recently made available on the photodissociation of BH3CO to BH3 + CO and is accomplished by using a weighted prior distribution for the second step from BH3 to BH + H2.
BH的初生旋转能和振动能分布是由BH 3 CO在193nm处的光解得到的。v ''= 0、1和2的旋转种群分布均显示J ” = 5时的最大种群,其< E rot>值分别为1020、730和590 cm -1。0、1和2级的相对振动总体分别为1.0、0.16和0.038。这些结果在旋转和振动方面都比三片段统计先验模型所预测的要冷得多。提出了一种两步顺序的机制,其中BH 3 CO光解离形成BH 3。一小部分BH 3物种具有进一步离解为BH + H 2所需的内部能量。该机制的建模是通过考虑最近可获得的有关BH 3 CO到BH 3 + CO的光解离的信息来辅助的,并且是通过对从BH 3到BH + H 2的第二步使用加权先验分布来完成的。还探讨了产生BH的几种非统计性次要途径的可能存在。
Rotational distributions of CO from the 193 nm photodissociation of BH3CO using nonresonant four-wave mixing for VUV generation
作者:L. Pasternack、B.R. Weiner、A.P. Baronavski
DOI:10.1016/s0009-2614(89)87271-9
日期:1989.1
using an excimer laser operating at 193nm and the nascent rotational energy distributions in CO ν″ = 0 and ν″ = 1 are measured by using laser-induced fluorescence of the fourth positive system of CO near 140 nm. The rotational energy distributions in the two manifolds can be characterized by temperatures of 362 ± 22 and 175 ± 8 K, respectively. The tunable VUV is generated using a nonresonant four-wave