Optical second harmonic generation in achiral bis(n-alkylamino)dicyanoquinodimethanes: alkyl chain length as the design element

P. Gangopadhyay, S. Sharma, A. Jaganmohan Rao, D. Narayana Rao, Shmuel Cohen, Israel Agranat, T. P. Radhakrishnan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Scopus citations

Abstract

Chain length of substituted n-alkyl groups is proposed to be a convenient design element for the generation of noncentrosymmetric crystal lattices of interest in optical second harmonic generation (SHG). Powder studies on 7,7-Bis(n-alkylamino)-8,8-dicyanoquinodimethanes indicate that moderate solid-state optical SHG is obtained when the alkyl chains are of length 4, 5, and 6, and no detectable SHG occurs when the chains are of length 0, 3, 7, 8, and 12. The significant role of the intermediate alkyl chain length in generating noncentric crystal lattices is examined using the crystal structures of the propyl, butyl, and octyl derivatives presented in this paper.

Original languageEnglish
Pages (from-to)466-472
Number of pages7
JournalChemistry of Materials
Volume11
Issue number2
DOIs
StatePublished - 1999

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