Investigation into the reactivity of M(ii5-C5R5)(CO)2(alkane) (M = Mn or Re; R = H, Me or Ph; alkane = n-heptane or cyclopentane) and Re(Tj5-C5H5)(CO)2(Xe) in solution at cryogenic and room temperature

Gavin I. Childs, Christopher S. Colley, Joanne Dyer, David Grills, Xue Zhong Sun, Jixin Yang, Michael W. George

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A series of M(r|5-C5R5)(CO)2(C5H10) complexes (R = H, Me or Ph; M = Mn or Re) have been characterised at low (Re only) and room temperature (R = H only) using infrared spectroscopy. The decay rates of these complexes have been measured and compared to those of the corresponding -heptane analogues. These comparisons show that the organometallic cyclopentane complexes are significantly longer-lived than the related -heptane complexes. The activation parameters for the reaction of the alkane complexes with CO, determined above room temperature, suggest that the reactivity of these complexes is governed by entropie rather than enthalpic factors. The decay rates measured for the permethylated and perphenylated cyclopentadienyl rhenium cyclopentane complexes show that these are more reactive towards CO than Re(n5-C5H5)(CO)2(C5HIO). The complex Re(n5-C5H5)(CO)j(Xe) has been characterised in liquid xenon at low temperature, with decay rate studies showing this to have a similar lifetime to Re(n5-C5HJ)(CO)2(-C7HI6) in heptane at a similar temperature.

Original languageEnglish
Pages (from-to)1901-1906
Number of pages6
JournalJournal of the Chemical Society, Dalton Transactions
Issue number12
Publication statusPublished - 2000


ASJC Scopus subject areas

  • Chemistry(all)

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