HEAT OF FORMATION OF CH2OH

被引：26

作者：

TRAEGER, JC ^{[1
]}

HOLMES, JL ^{[1
]}

机构：

[1] UNIV OTTAWA,DEPT CHEM,OTTAWA K1N 6N5,ONTARIO,CANADA

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1993年 / 97卷 / 14期

关键词：

D O I：

10.1021/j100116a001

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Threshold photoionization mass spectrometry has been used to measure the appearance energy for the formation of CH2OH+ from methanol. A value of 708.5 +/- 0.8 kJ mol-1 is obtained for the 298 K cationic heat of formation, which results in a corresponding heat of formation for the hydroxymethyl radical of -18.9 +/- 1.0 kJ mol-1. The discrepancy between this value and the significantly higher heat of formation obtained from a kinetic study of the reaction of CH2OH with HBr and HI is discussed and partly resolved. An absolute proton affinity for formaldehyde of 712.9 +/- 1.0 kJ mol-1 is derived.

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页码：3453 / 3455

页数：3

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