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Ionization‐Induced Solvent Migration in Acetanilide‐Methanol Clusters Inferred from Isomer‐Selective Infrared Spectroscopy
Author(s) -
Weiler Martin,
Nakamura Takashi,
Sekiya Hiroshi,
Dopfer Otto,
Miyazaki Mitsuhiko,
Fujii Masaaki
Publication year - 2012
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201200704
Subject(s) - acetanilide , chemistry , infrared spectroscopy , spectroscopy , methanol , ionization , solvent , infrared , photochemistry , organic chemistry , ion , physics , quantum mechanics , optics
We present the resonance‐enhanced multiphoton ionization, infrared‐ultraviolet hole burning (IR‐UV HB), and IR dip spectra of the trans ‐acetanilide–methanol (AA–MeOH) cluster in the S 0 , S 1 , and cationic ground state (D 0 ) in a supersonic jet. The IR‐UV HB spectra demonstrate the co‐existence of two isomers in S 0,1 , in which MeOH binds either to the NH or the CO site of the peptide linkage in AA, denoted as AA(NH)–MeOH and AA(CO)–MeOH. When AA(CO)–MeOH is selectively ionized, its IR spectrum in D 0 is the same as that measured for AA + (NH)–MeOH. Thus, photoionization of AA(CO)–MeOH induces migration of MeOH from the CO to the NH site with 100% yield.