Infrared spectra of isotopically substituted XCo(CO)4 (X=H, EtC(O), EtOC(O) and EtOC(O)CH2) molecules

György Bor, Giuseppe Fachinetti, Carl D. Hoff, Gyula Palyi, Claudia Zucchi, Ferenc Ungváry, Rina Tannenbaum

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In this paper we present a series of observations on the infrared spectra of DCo(CO)4 (in comparison with HCo(CO)4) as well as of the l3CO-exchanged derivatives of HCo(CO)4, EtOC(O)CH 2Co(CO)4, EtOC(O)Co(CO)4 and EtC(O)Co(CO) 4. Calculated frequencies and intensities for HCo( 12CO)n(13CO)4-n based on the C-O factored force field approximation predict data in excellent agreement with that observed experimentally. Splitting of the E band in the complexes R-Co(CO)4 is shown to depend on reduction of local site symmetry and appears to be greatest for R groups containing a local dipole capable 'of through-space' interaction with the three equatorial carbonyls. The analysis of the infrared absorption bands for the l3CO-substituted compounds sheds light on the nature of bonding and symmetry of these molecules, and the extent of interaction between the organic substituent and the four CO groups in the cobalt tetracarbonyl compound.

Original languageEnglish (US)
Pages (from-to)168-176
Number of pages9
JournalInorganica Chimica Acta
StatePublished - Sep 8 2003


  • Infrared spectra
  • Isotopic exchange studies
  • Metal carbonyls

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry


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