1. Design of Near-Infrared-Absorbing Unsymmetrical Polymethine Dyes with Large Quadratic Hyperpolarizabilities.
- Author
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Pascal, Simon, Getmanenko, Yulia A., Yadong Zhang, Davydenko, Iryna, Minh Hoang Ngo, Pilet, Guillaume, Redon, Sébastien, Bretonnière, Yann, Maury, Olivier, Ledoux-Rak, Isabelle, Barlow, Stephen, Marder, Seth R., and Andraud, Chantal
- Subjects
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ELECTROCHEMICAL analysis , *ELECTROCHEMISTRY , *CYANINES , *CHEMICAL bond lengths , *DIPOLE antennas - Abstract
Fifteen heptamethine dyes in which a tricyanofuran acceptor is linked to donors of different strengths were synthesized, and their absorption, thermal, electrochemical, and second-order nonlinear optical properties were investigated. While the variation of the peripheral bulky substituents allowed a decrease of the intermolecular interactions in the solid state, subtle engineering of the heterocyclic donor provided dyes with electronic structures that varied between dipolar and cyanine-like (i.e., with little bond length alternation and with ground and excited states having similar dipole moment) and remarkably high quadratic hyperpolarizabilities (μβ1.9) of up to 115000 × 10-48 esu. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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