THE HEAT OF FORMATION OF (CH3O)2B+

被引：11
|
作者：
RANATUNGA, TD [1 ]
POUTSMA, JC [1 ]
SQUIRES, RR [1 ]
KENTTAMAA, HI [1 ]
机构：
[1] PURDUE UNIV,DEPT CHEM,W LAFAYETTE,IN 47907
来源：
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES | 1993年 / 128卷 / 03期
关键词：
BORON; THERMOCHEMISTRY; BORINIUM ION; TRIMETHYL BORATE; PROTON AFFINITY;
D O I：
10.1016/0168-1176(93)87072-Z
中图分类号：
O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号：
070203 ; 070304 ; 081704 ; 1406 ;
摘要：
The proton affinity of trimethyl borate was determined to be 197 +/- 3 kcal mol-1 by bracketing in both directions in a Fourier-transform ion cyclotron resonance mass spectrometer. This value was used to calculate a heat of formation of -46.3 +/- 3.0 kcal mol-1 for CH3O(H)B(OCH3)2+. Collision-induced dissociation threshold energy measurements carried out in a flowing afterglow-triple quadrupole instrument yield an activation energy of 39.5 +/- 3.5 kcal mol-1 for the dissociation of CH3O(H)B(OCH3)2+ to CH3OH and (CH3O)2B+. This bond dissociation energy, together with the heat of formation of CH3O(H)B(OCH3)2+, was used to calculate a heat of formation of 41.4 +/- 4.6 kcal mol-1 for (CH3O)2B+.
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页码：L1 / L4
页数：4
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