Engineering second-order nonlinear optical activity by means of a noncentrosymmetric distortion of the [Te-N]2 supramolecular synthon

Anthony F. Cozzolino, Qin Yang, Ignacio Vargas-Baca

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Moderate steric repulsion within the supramolecular ribbon chains assembled by 1,2,5-telluradiazole derivatives causes a distortion of the [Te-N] 2 supramolecular synthon which removes the inversion center from the four-membered virtual ring. This geometrical feature can propagate through the lattice, creating a noncentrosymmetric crystal with second-order nonlinear optical (NLO) properties. This principle was demonstrated in the cases of 3,4-dicyano-1,2,5-telluradiazole and 5,6-dichlorobenzo-2,1,3-telluradiazole. The second harmonic generation efficiency of these materials, however, is modest because the molecular dipole moments have a nearly antiparallel arrangement in the ribbons. The structure of 5-benzoylbenzo-2,1,3-telluradiazole demonstrates that it is indeed possible to extend this strategy to generate acentric crystals of benzo-2,1,3-telluradiazoles featuring pendant groups (including NLO chromophores) and in this way design more efficient NLO materials.

Original languageEnglish
Pages (from-to)4959-4964
Number of pages6
JournalCrystal Growth and Design
Volume10
Issue number11
DOIs
StatePublished - Nov 3 2010

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