In-situ second-harmonic generation and luminescence measurements for structural characterization of ruthenium-polypyridine complex monolayers with two and four aliphatic tails at the air/water interface

Takashi Nakano, Yasuhiro Yamada, Taku Matsuo, Sunao Yamada

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Abstract

Langmuir monolayer assemblies of ruthenium-polypyridine complexes having two and four aliphatic tails were studied by in-situ optical second-harmonic generation (SHG) and luminescence measurements, together with surface pressure-molecular area (π-A) isotherms. As the monolayer was compressed, the four-tailed complex showed a distinct phase transition at a 30-40 mN/m region from phase I (1.3 nm2 mean molecular area) to phase II (1.1 nm2). Excitation with 1064-nm light gave an SHG signal at 532 nm that appeared almost synchronously with the increase of surface pressure, but the p-polarized component of the SHG signal, induced by either p- (parallel to the plane of incidence) or s- (perpendicular to the plane of incidence) polarized fundamental light, showed a different profile upon compression of the monolayer. In the phase II region, the p-polarized component increased steeply, whereas the s-polarized component decreased to almost zero. A significant blue-shift and a longer lifetime of the luminescence signal were also observed in phase II. Thus, a tightly packed structure in which the main hyperpolarizability tensor is directed roughly perpendicular to the water surface is suggested for phase II. For the two-tailed complex, on the other hand, no appreciable phase transitions were observed, only a liquid-expanded phase (0.9 nm2). The results are ascribed to differences in the number of long aliphatic tails.

Original languageEnglish
Pages (from-to)8569-8573
Number of pages5
JournalJournal of Physical Chemistry B
Volume102
Issue number43
Publication statusPublished - Oct 22 1998

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Luminescent Measurements
Ruthenium
Phase Transition
Harmonic generation
ruthenium
Luminescence
Monolayers
harmonic generations
Air
luminescence
Light
Pressure
Water
air
Incidence
incidence
Phase transitions
water
monomolecular films
Light polarization

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

In-situ second-harmonic generation and luminescence measurements for structural characterization of ruthenium-polypyridine complex monolayers with two and four aliphatic tails at the air/water interface. / Nakano, Takashi; Yamada, Yasuhiro; Matsuo, Taku; Yamada, Sunao.

In: Journal of Physical Chemistry B, Vol. 102, No. 43, 22.10.1998, p. 8569-8573.

Research output: Contribution to journalArticle

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abstract = "Langmuir monolayer assemblies of ruthenium-polypyridine complexes having two and four aliphatic tails were studied by in-situ optical second-harmonic generation (SHG) and luminescence measurements, together with surface pressure-molecular area (π-A) isotherms. As the monolayer was compressed, the four-tailed complex showed a distinct phase transition at a 30-40 mN/m region from phase I (1.3 nm2 mean molecular area) to phase II (1.1 nm2). Excitation with 1064-nm light gave an SHG signal at 532 nm that appeared almost synchronously with the increase of surface pressure, but the p-polarized component of the SHG signal, induced by either p- (parallel to the plane of incidence) or s- (perpendicular to the plane of incidence) polarized fundamental light, showed a different profile upon compression of the monolayer. In the phase II region, the p-polarized component increased steeply, whereas the s-polarized component decreased to almost zero. A significant blue-shift and a longer lifetime of the luminescence signal were also observed in phase II. Thus, a tightly packed structure in which the main hyperpolarizability tensor is directed roughly perpendicular to the water surface is suggested for phase II. For the two-tailed complex, on the other hand, no appreciable phase transitions were observed, only a liquid-expanded phase (0.9 nm2). The results are ascribed to differences in the number of long aliphatic tails.",
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