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Molecular rotors confined at an ordered 2D interface.

Taizo Mori1, Hirokazu Komatsu, Naoki Sakamoto

  • 1World Premier International (WPI) Centre for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan. ARIGA.Katsuhiko@nims.go.jp NAKANISHI.Waka@nims.go.jp.

Physical Chemistry Chemical Physics : PCCP
|August 1, 2017
PubMed
Summary
This summary is machine-generated.

Molecular rotors at air-water interfaces exhibit suppressed fluorescence in monolayers, indicating unrestricted intramolecular rotation. Excimer emission appears only after monolayer collapse, suggesting rotation is not inhibited in ordered films.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Photophysics

Background:

  • Twisted intramolecular charge transfer (TICT) molecules are sensitive to their environment.
  • Investigating molecular behavior at interfaces is crucial for understanding material properties.

Purpose of the Study:

  • To investigate intramolecular rotation of TICT molecules at air-water interfaces.
  • To synthesize and characterize lipophilized TICT derivatives (CCVJ-C12 and CCVJ-Chol) for interface studies.

Main Methods:

  • In situ fluorescence spectroscopy of TICT derivatives (CCVJ-C12, CCVJ-Chol) at the air-water interface.
  • Compression of molecular monolayers and observation of fluorescence changes.
  • Analysis of Langmuir-Blodgett (LB) films.

Main Results:

  • TICT molecules in solution showed viscosity-dependent fluorescence, typical of molecular rotors.
  • At the air-water interface, monomer emission was suppressed in ordered monolayers.
  • Excimer emission was observed only after monolayer collapse.
  • Intramolecular rotation was not inhibited in dense ordered monolayers or transferred LB films.

Conclusions:

  • Intramolecular rotation of CCVJ derivatives is not inhibited in dense, ordered monolayers at the air-water interface.
  • Molecular rotors retain rotational freedom even when confined to 2D monolayers or transferred films.
  • The study provides insights into the photophysical behavior of molecular rotors in interfacial systems.