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Proceedings Paper

The search for novel highly polar betainic optical materials
Author(s): Ojars Neilands; Maris Utinans
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Paper Abstract

Mentioned betaines comprise in molecule directly connected electron donor anion moiety and electron acceptor cation A novel class of active nonlinear optical (NL) materials -- strongly dipolar intramolecular salts (betaines) are offered. The betaines are principally different from the commonly used push-pull dipolar molecules. A donor moiety is directly bonded to heterocyclic N-onium cation moiety within the same molecule. The anion is five-member β-dicarbonyl compound, usually indan-1,3-dione. Calculations show that electric dipole moment is changed considerably at photo-induced intramolecular electron transfer from HOMO to LUMO, the difference between dipole moment values in the ground and excited states being unusual large. The HOMO is strongly localized on the anion moiety while the LUMO -- on the heterocyclic N-onium cation moiety. The hyperpolarizabilities are remarkable. Betaines are easy to synthesize and fine-tuning of their NLO properties is possible. Preparing of betaine solution in polymer matrices (host-guest systems) and formation of films is found to be the best method for examining the NLO properties. Obtained films are subjected to corona poling before measuring the change of surface potential. Due to strong photo oxidation it is necessary to exclude contact with air or avoid light while processing betaines films.

Paper Details

Date Published: 8 August 2003
PDF: 9 pages
Proc. SPIE 5122, Advanced Organic and Inorganic Optical Materials, (8 August 2003); doi: 10.1117/12.515723
Show Author Affiliations
Ojars Neilands, Riga Technical Univ. (Latvia)
Maris Utinans, Riga Technical Univ. (Latvia)

Published in SPIE Proceedings Vol. 5122:
Advanced Organic and Inorganic Optical Materials
Andris Krumins; Donats Millers; Inta Muzikante; Andris Sternbergs; Vismants Zauls, Editor(s)

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