Surface-assisted transient displacement charge technique. II. Effect of gases on photoinduced charge transfer in self-assembled monolayers

Alexey V. Krasnoslobodtsev, Sergei N. Smirnov

Research output: Contribution to journalArticle

Abstract

Surface-assisted photoinduced transient displacement charge (SPTDC) technique was used to study charge transfer in self-assembled monolayers of 7-diethylaminocoumarin covalently linked to an oxide surface in the atmosphere of different gases. The dipole signal was found to be opposite to that in solution and dependent on the nature of the gas and its pressure. The results were explained by collision-induced relaxation that impedes uninhibited tilting of molecules onto the surface. Collisions with paramagnetic oxygen induce intersystem crossing to long-lived triplet dipolar states of coumarin with the rate close to half of that for the collision rate.

Original languageEnglish (US)
Pages (from-to)17941-17948
Number of pages8
JournalJournal of Physical Chemistry B
Volume110
Issue number36
DOIs
StatePublished - Sep 14 2006

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Self assembled monolayers
Charge transfer
Gases
charge transfer
gases
collision rates
collisions
Oxides
gas pressure
Oxygen
dipoles
atmospheres
Molecules
oxides
oxygen
molecules

ASJC Scopus subject areas

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

Cite this

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AB - Surface-assisted photoinduced transient displacement charge (SPTDC) technique was used to study charge transfer in self-assembled monolayers of 7-diethylaminocoumarin covalently linked to an oxide surface in the atmosphere of different gases. The dipole signal was found to be opposite to that in solution and dependent on the nature of the gas and its pressure. The results were explained by collision-induced relaxation that impedes uninhibited tilting of molecules onto the surface. Collisions with paramagnetic oxygen induce intersystem crossing to long-lived triplet dipolar states of coumarin with the rate close to half of that for the collision rate.

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