IR spectroscopic study on phenol-triethylsilane dihydrogen-bonded cluster in the electronic excited state

Ishikawa, Haruki

Permalink

https://hdl.handle.net/2142/100549 Copy

Description

Title

IR spectroscopic study on phenol-triethylsilane dihydrogen-bonded cluster in the electronic excited state

Author(s)

Ishikawa, Haruki

Contributor(s)

• Matsumoto, Yoshiteru
• Kasahara, Yasutoshi
• Uchida, Masaaki
• Shimizu, Takutoshi

Issue Date

2018-06-18

Keyword(s)

Clusters/Complexes

Abstract

To reveal detailed characters of the dihydrogen bond at molecular level, we have been carrying out IR spectroscopic study on the Si-H· · · H-O type dihydrogen-bonded clustersa,b . It was found that the structures of the phenol-alkylsilane 1:1 clusters are determined by the competition between the dihydrogen bond and the dispersion interaction in the case of the S0 state of the neutral clusters. On the other hand, the dihydrogen bond exhibit a dominant contribution in the cationic states. Based on these results, it is expected the balance between the dihydrogen bond and the dispersion interaction is expected to change in the S1 state compared with the S0 state. Thus, we have carried out an IR spectroscopic study on the phenol-alkylsilane clusters, in the present study. In the present paper, we will report mainly on the results of the phenol-triethylsilane (PhOH-TES) clusters. It is already reported that three isomers appear in the fluorescence excitation spectrum of PhOH-TES. Using the vibronic bands of these isomers as excitation transitions, IR spectra in the S1 state were observed by the UV-IR double resonance technique. All of the isomers exhibit much larger redshifts of the OH stretching band compared with those in the S0 state. It indicates the strengthening of the dihydrogen bond in the S1 state. In addition, all the isomer exhibit Franck-Condon-like patterns. The patterns change by the intermediate vibrational levels selected by the UV transitions. Similar Franck-Condon-like pattern in the IR transition is reported in the literaturec . This result indicates a strong coupling between the OH stretch and the intermolecular vibrational mode. This coupling is considered to be a characteristic feature in the S1 state.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100549

DOI

10.15278/isms.2018.MK07

Copyright and License Information

Copyright 2018 Haruki Ishikawa

Owning Collections