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Proceedings Paper

Alteration in structure of nanometer films of polymethine dyes
Author(s): Elena N. Kaliteevskaya; Valentina P. Krutyakova; Tatyana K. Razumova; Anton A. Starovoytov; Yuri M. Voronin
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Paper Abstract

Layers of carbocyanine polymethine dyes were studied to evaluate the effect exerted by the molecular structure and thickness of a layer on its component composition. Thin layers contain cis-monomers of different structure as major form. The number of types of cis-isomers decreases and the relative concentration of the all-trans isomers increases with increasing thickness. As the electron-donating ability of end groups and the chain length grow, the number of stereoisomers of different types increases. It was concluded that the equilibrium stereoisomeric composition of the layer is determined by degree of asymmetry, which is induced in the intramolecular electron density distribution by the interaction with substrate. We developed the model for rearrangement of layer by heating and photoexcitation. Reversible changes in the component composition are due to the stereoisomerization upon rotation of a molecule fragment around the second polymethine chain bond and irreversible changes, due to the change in asymmetry of the electron density distribution owing to irreversible spatial reorientation of layer components. The spatial reorientation of layer components is determined by stereoisomerization upon rotations around the central bonds.

Paper Details

Date Published: 28 February 2011
PDF: 6 pages
Proc. SPIE 7996, Fundamentals of Laser-Assisted Micro- and Nanotechnologies 2010, 79960I (28 February 2011); doi: 10.1117/12.887376
Show Author Affiliations
Elena N. Kaliteevskaya, St. Petersburg State Univ. of Information Technologies, Mechanics and Optics (Russian Federation)
Valentina P. Krutyakova, St. Petersburg State Univ. of Information Technologies, Mechanics and Optics (Russian Federation)
Tatyana K. Razumova, St. Petersburg State Univ. of Information Technologies, Mechanics and Optics (Russian Federation)
Anton A. Starovoytov, St. Petersburg State Univ. of Information Technologies, Mechanics and Optics (Russian Federation)
Yuri M. Voronin, St. Petersburg State Univ. of Information Technologies, Mechanics and Optics (Russian Federation)


Published in SPIE Proceedings Vol. 7996:
Fundamentals of Laser-Assisted Micro- and Nanotechnologies 2010
Vadim P. Veiko; Tigran A. Vartanyan, Editor(s)

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