Nuclear resonance vibrational spectra of five-coordinate imidazole-ligated iron(II) porphyrinates

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DOIResolve DOI: http://doi.org/10.1021/ic201580v
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TypeArticle
Journal titleInorganic Chemistry
ISSN0020-1669
1520-510X
Volume51
Issue3
Pages13591370; # of pages: 12
AbstractNuclear resonance vibrational spectra have been obtained for six five-coordinate imidazole-ligated iron(II) porphyrinates, [Fe(Por)(L)] (Por = tetraphenylporphyrinate, octaethylporphyrinate, tetratolylporphyrinate, or protoporphyrinate IX and L = 2-methylimidazole or 1,2-dimethylimidazole). Measurements have been made on both powder and oriented crystal samples. The spectra are dominated by strong signals around 200–300 cm–1. Although the in-plane and out-of-plane vibrations are seriously overlapped, oriented crystal spectra allow their deconvolution. Thus, oriented crystal experimental data, along with density functional theory (DFT) calculations, enable the assignment of key vibrations in the spectra. Molecular dynamics are also discussed. The nature of the Fe–NIm vibrations has been elaborated further than was possible from resonance Raman studies. Our study suggests that the Fe motions are coupled with the porphyrin core and peripheral groups motions. Both peripheral groups and their conformations have significant influence on the vibrational spectra (position and shape).
Publication date
LanguageEnglish
AffiliationNRC Steacie Institute for Molecular Sciences; National Research Council Canada
Peer reviewedYes
NPARC number21268980
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Record identifierce12c5cd-3678-4db7-844e-85df7167ce7f
Record created2013-11-28
Record modified2016-05-09
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