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

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

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+.

Original languageEnglish
Pages (from-to)1146-1149
Number of pages4
JournalJournal of Physical Chemistry C
Volume111
Issue number3
DOIs
Publication statusPublished - 2007 Jan 25

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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