Second-order nonlinear optical properties of amphiphilic porphyrins in Langmuir-Blodgett monolayer assemblies

Sunao Yamada, Kotaro Kuwata, Hiroaki Yonemura, Taku Matsuo

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Abstract

Optical second harmonic generation (SHG) from the Langmuir-Blodgett (LB) monolayer assemblies of amphiphilic porphyrin and its some metal complexes has been investigated. Distinct SHG responses were observed with monolayers of amphiphilic 5-(4-N-hexadecylpyridinium)-10,15,20-triphenylporphine bromide (free base: H2 porphyrin) and its magnesium (Mg), copper (Cu), and zinc (Zn) complexes. The efficiency of SHG was in the order of Mg → Zn → Cu → H2-porphyrins, which could be well correlated with the order of the first reduction potential of the porphyrin. The result indicated that SHG was mainly attributed to charge transfer from the porphyrin ring to the pyridinium group. The tilt angle of the molecular hyperpolarizability for the Zn porphyrin was evaluated.

Original languageEnglish
Pages (from-to)115-119
Number of pages5
JournalJournal of Photochemistry and Photobiology, A: Chemistry
Volume87
Issue number2
DOIs
Publication statusPublished - Mar 29 1995

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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