Electronic interactions between inorganic nanowires and organic electron acceptors: Drastic changes in optical response and molecular vibration

Jun Ichi Fujisawa, Naoya Tajima, Koichi Tamaki, Masatsugu Shimomura, Teruya Ishihara

研究成果: Article査読

22 被引用数 (Scopus)

抄録

We have studied electronic interactions between inorganic nanowires and organic molecules and the effects on optical response and molecular vibration, using quasi-one-dimensional organic - inorganic hybrid compounds, methylviologen lead iodide (MVPb2I6) and piperidinium lead iodide (PDPbI3). The materials consist of lead iodide nanowires with a diameter of 0.5 nm and intervening organic molecules, methylviologen (MV 2+) and piperidinium ion (PD+), respectively. MV 2+ has a very high electron affinity, in contrast to PD+. By comparison of the optical absorption spectra between the compounds, it is shown that a broad absorption band appears in the visible region by varying organic molecules from PD+ to MV2+. The absorption band in MVPb2I6 is assigned to charge-transfer transitions from the lead iodide nanowire to MV2+. In the infrared absorption spectrum of MVPb2I6, a large amount of low-energy shift and a striking increase in oscillator strength were observed for the molecular vibration around the nitrogen atoms in MV2+. These features in MVPb2I6 are owing to electronic interactions between the nanowire and MV2+. Electronic interactions in MVPb2I 6 are attributed to charge-transfer interactions, which result from electronic couplings between the valence band (VB) of the nanowire and the lowest unoccupied molecular orbital (LUMO) of MV2+.

本文言語English
ページ(範囲)1146-1149
ページ数4
ジャーナルJournal of Physical Chemistry C
111
3
DOI
出版ステータスPublished - 2007 1 25

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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