Infrared spectra of molecular B(OH)3 and HOBO in solid argon
摘要:
Anhydrous B(OH)3 was pressed into a pellet and sublimed at room temperature under vacuum to give molecular B(OH)3 for argon matrix infrared study. The spectrum showed sharp fundamentals without the effect of hydrogen bonding observed in the solid. Fermi resonances were characterized for two fundamentals. The observed frequencies for B(OH)3 and the three deuterium substituted molecules are in agreement with values from self-consistent field/double zeta plus polarization (SCF/DZP) calculations allowing for appropriate scale factors. The major thermal decomposition products from pulsed laser evaporation of B(OH)3 were H2O, B2O3, and HOBO. Molecular HOBO was characterized by a strong 2020 cm−1 fundamental, which was confirmed by SCF/DZP calculations.
Deuterofluoboric acid and nitron deuterotetrafluoroborate
作者:G.A. Olah
DOI:10.1016/0022-1902(61)80494-6
日期:1961.2
Deuterofluoboricacid was prepared from deuteroboric acid and deuterium fluoride or anhydrous silver tetrafluoroborate and deuterium chloride. It was analysed in the form of the insoluble nitron-DBF4 salt. A structural investigation of the salt resulted in suggesting an aromatic triazolium tetrafluoroborate structure. Similar structures are proposed for other nitron salts used in inorganic analytical
Abstract The kinetic deuteriumisotope effect in the thermaldehydration process from H 3 BO 3 to HBO 2 (III) was determined using simultaneous TG and DSC. The rate constant ratio of H 3 BO 3 to D 3 BO 3 obtained by the analysis of isothermal TG and DSC curves was found to be smaller than unity. Both activation energy, E , and frequency factor, A , for the dehydration of H 3 BO 3 proved to be larger
摘要 利用TG和DSC同时测定了从H 3 BO 3 到HBO 2 (III)的热脱水过程中的动力学氘同位素效应。通过等温TG和DSC曲线分析发现H 3 BO 3 与D 3 BO 3 的速率常数比小于1。使用非等温 TG 和 DSC 证明,H 3 BO 3 脱水的活化能 E 和频率因子 A 均大于 D 3 BO 3 的活化能。还简要讨论了硼酸热脱水中氘动力学同位素效应的起源。
Hydrolysis of Thymidine Boranomonophosphate and Stepwise Deuterium Substitution of the Borane Hydrogens. <sup>31</sup>P and <sup>11</sup>B NMR Studies
作者:Hong Li、Charles Hardin、Barbara Ramsay Shaw
DOI:10.1021/ja9540280
日期:1996.1.1
hydrolysis of the O3P−BH33- to produce phosphonate and boric acid. A three-step deuterium substitution of the borane hydrogens in O3P−BH33- was detected in D2O by the presence of a 31P isotope shift. The 31P resonances shifted downfield by 0.14 ppm upon substitution of each of three 1H atoms by 2H. Exchange of the borane hydrogens with D2O occurs as sequential processes superimposed upon hydrolysis of O3P−BH33-
A General Protocol for the Polycondensation of Thienyl <i>N</i>-Methyliminodiacetic Acid Boronate Esters To Form High Molecular Weight Copolymers
作者:Josue Ayuso Carrillo、Michael L. Turner、Michael J. Ingleson
DOI:10.1021/jacs.6b07666
日期:2016.10.12
(AA-type) monomers in Suzuki–Miyaura copolymerizations with dibromo-heteroarenes (BB-type monomers). A single polymerization protocol is applicable for the formation of five alternating thienyl copolymers that are (or are close analogues of) state of the art materials used in organic electronics. The five polymers were produced in excellent yields and with high molecular weights comparable to those produced