THRESHOLD COLLISIONAL ACTIVATION OF FEC2H6+ - FE+.ETHANE VS FE+.DIMETHYL STRUCTURES

被引：52
作者：
SCHULTZ, RH [1 ]
ARMENTROUT, PB [1 ]
机构：
[1] UNIV UTAH,DEPT CHEM,SALT LAKE CITY,UT 84112
来源：
JOURNAL OF PHYSICAL CHEMISTRY | 1992年 / 96卷 / 04期
关键词：
D O I：
10.1021/j100183a031
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 collisional activation (TCA) of FeC2H6+ is studied in a guided-ion beam mass spectrometer. Parent ions are formed by reaction of Fe+ with either ethane or acetone in a flow tube ion source which ensures their thermalization. We present evidence that ions formed in the two ways have different structures corresponding to Fe+-ethane and Fe+-dimethyl, respectively. We determine D-degrees-0(Fe+-C2H6) = 15.3 +/- 1.4 kcal/mol and D-degrees-0(CH3Fe+-CH3) = 43.1 +/- 2.6 kcal/mol and that Fe(C2H6)+ is more stable than Fe(CH3)2+ by 3.5 +/- 1.7 kcal/mol. These experimental values are compared with those from a recent theoretical calculation. The utility of TCA as a proble of thermochemistry and the structure of transition metal-alkane and -dialkyl species is assessed.
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页码：1662 / 1667
页数：6
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