Infrared-Enhanced Fluorescence-Gain Spectroscopy: Conformation-Specific Excited-State Infrared Spectra of Alkylbenzenes
作者： Daniel M. Hewett , Daniel P. Tabor , Joshua L. Fischer , Edwin L. Sibert , Timothy S. Zwier
DOI: 10.1021/ACS.JPCLETT.7B02276
关键词:
摘要: An ultraviolet–infrared (UV-IR) double-resonance method for recording conformation-specific excited-state infrared spectra is described. The takes advantage of an increase in fluorescence signal phenylalkanes produced by excitation the S1 origin levels different conformational isomers. shorter lifetimes these IR-excited molecules, combined with their red-shifted emission, provides a way to discriminate due infrared-excited molecules from fluorescence, resulting high signal-to-noise ratios. Spectra series and capped phenylalanine derivative (Ac-Phe-NHMe) demonstrate potential method. spectrum alkyl CH stretch region ethylbenzene well-fit anharmonic model developed ground electronic state, which explicitly into account stretch–bend Fermi resonance.
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