Ionization‐Induced Solvent Migration in Acetanilide‐Methanol Clusters Inferred from Isomer‐Selective Infrared Spectroscopy |
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| Authors: | Dr Martin Weiler Takashi Nakamura Prof Dr Hiroshi Sekiya Prof Dr Otto Dopfer Prof Dr Mitsuhiko Miyazaki Prof Dr Masaaki Fujii |
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| Institution: | 1. Chemical Resources Laboratory, Tokyo Institute of Technology, Yokohama 226‐8503 (Japan);2. Graduate School of Science, Kyushu University, Fukuoka 812‐8581 (Japan);3. Institut für Optik und Atomare Physik, Technische Universit?t Berlin, 10623 Berlin (Germany) |
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| Abstract: | 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 S0, S1, and cationic ground state (D0) in a supersonic jet. The IR‐UV HB spectra demonstrate the co‐existence of two isomers in S0,1, 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 D0 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. |
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| Keywords: | clusters hydrogen bonds IR spectroscopy isomerization photoionization |
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