Threshold collisional activation of FeC2H6+: Fe+·ethane vs Fe+·dimethyl structures

Richard H. Schultz, P. B. Armentrout

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45 Scopus citations


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°0(Fe+-C2H6) = 15.3 ± 1.4 kcal/mol and D°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 probe of thermochemistry and the structure of transition metal-alkane and -dialkyl species is assessed.

Original languageEnglish
Pages (from-to)1662-1667
Number of pages6
JournalJournal of Physical Chemistry
Issue number4
StatePublished - 1992
Externally publishedYes


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