Structural evolution of (1-NpOH) clusters studied by R2PI and IR Dip spectroscopies

R2PI及びIR Dip分光法により研究した1-ナフトールクラスターの構造発展

佐伯 盛久; 石内 俊一*; 酒井 誠*; 橋本 健朗*; 藤井 正明*

Saeki, Morihisa; Ishiuchi, Shunichi*; Sakai, Makoto*; Hashimoto, Kenro*; Fujii, Masaaki*

A large-size 1-naphthol cluster, (1-NpOH), with n=30 was prepared by using a high-pressure pulsed valve. The electronic and vibrational transitions of (1-NpOH) with n=3-9 were measured by resonant two photon ionization (R2PI) and ion-detected IR dip spectroscopies. The (1-NpOH) and the (1-NpOH) clusters show relatively sharp origin bands. The structure of (1-NpOH) was determined by comparison of the IR dip spectrum with the simulated one by DFT calculation, while those of (1-NpOH) (n4) were discussed in terms of topological geometries of a hydrogen-bonded network. Those analyses suggest that (1) the (1-NpOH) cluster has the cyclic structure where three 1-NpOH monomers are linked by both the hydrogen-bonding and the ...C-H interaction between naphthyl rings and (2) the (1-NpOH) cluster with n4 is built up by attaching the 1-NpOH monomers to the (1-NpOH) core.