The Infrared Spectrum of the Matrix-Isolated Phenyl Radical

A. V. Friderichsen, J. G. Radziszewski, M. R. Nimlos, P. R. Winter, D. C. Dayton, D. E. David, G. B. Ellison

Research output: Contribution to journalArticlepeer-review

99 Scopus Citations

Abstract

We have measured the infrared absorption spectrum of C6H5, X̃ 2A1, in an Ar matrix at 10 K. The experimental frequencies (cm-1) and polarizations follow, a1 modes: 3086, 3072, 3037, 1581, 1441, 1154, 1027, 997, 976, 605; b1 modes: 972, 874, 706, 657, 416; b2 modes: 3071, 3060, 1624, 1432, 1321, 1283, 1159, 1063, and 587. Three different methods have been used for the production of the phenyl radicals. Infrared absorption spectra of five deuterated isotopomers, C6D5, p-C6H4D, p-C6HD4, o-C6H4D, and m-C6H4D, were recorded to compare experimental frequency shifts with calculated (UB3LYP/cc-pVDZ) harmonic frequency shifts. The use of CO2 or NO as internal standards enabled the experimental determination of absolute infrared intensities. The linear dichroism was measured with photooriented samples to establish experimental polarizations of each vibrational band. True gas-phase vibrational frequencies were estimated by considering the gas-to-matrix shifts and matrix inhomogeneous line broadening. The phenyl radical matrix frequencies listed above are within ±1% of the gas-phase vibrational frequencies. The C6H5 frequencies from this paper supersede our earlier values reported in J. Am. Chem. Soc. 1996, 118, 7400-7401. See also: http://ellison.colorado.edu/phenyl.

Original languageAmerican English
Pages (from-to)1977-1988
Number of pages12
JournalJournal of the American Chemical Society
Volume123
Issue number9
DOIs
StatePublished - 7 Mar 2001

NREL Publication Number

  • NREL/JA-570-29958

Fingerprint

Dive into the research topics of 'The Infrared Spectrum of the Matrix-Isolated Phenyl Radical'. Together they form a unique fingerprint.

Cite this