Unprecedented Large Hyperpolarizability of Twisted Chromophores in Polar Media

Alexander J.T. Lou, Stefania Righetto, Christopher Barger, Cristiano Zuccaccia, Elena Cariati, Alceo Macchioni, Tobin J Marks

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Twisted intramolecular charge transfer (TICT) chromophores exhibit uniquely large second-order optical nonlinearities (μβ). However, their promise as electro-optic (E-O) materials is yet untapped, reflecting a strong tendency to aggregate in low-polarity media, leading to a dramatic fall in μβ. Until now, TICT chromophores in deaggregating polar solvents suffered decreased response due to polarity-driven changes in electronic structure. Here we report a new series of benzimidazolium-based TICT chromophores with interaryl torsional angles in the range of 64-77°. The most twisted, B2TMC-2, exhibits a large μβvec = -26,000 × 10-48 esu (at 1907 nm) in dilute nonpolar CH2Cl2 solution, which is maintained in polar DMF (μβvec= -20,370 × 10-48 esu) as measured by DC electric field-induced second harmonic generation (EFISH). Sterically enforced interaryl torsional angles are confirmed by single-crystal X-ray diffraction and solution phase Nuclear Overhauser Effect (NOE) NMR, and spectroscopic characterization reveals a zwitterionic/aromatic ground state electronic structure associated with the high μβ. We show that increasingly disrupted conjugation is correlated with increased μβ even at intermediate twist angles. The excellent performance and reduced aggregation in polar solvents opens new avenues for bridging microscopic and macroscopic chromophore performance.

Original languageEnglish
Pages (from-to)8746-8755
Number of pages10
JournalJournal of the American Chemical Society
Volume140
Issue number28
DOIs
Publication statusPublished - Jul 18 2018

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Chromophores
Charge transfer
X-Ray Diffraction
Electronic structure
Electrooptical effects
Harmonic generation
Ground state
Agglomeration
Electric fields
Nuclear magnetic resonance
Single crystals
X ray diffraction

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Lou, A. J. T., Righetto, S., Barger, C., Zuccaccia, C., Cariati, E., Macchioni, A., & Marks, T. J. (2018). Unprecedented Large Hyperpolarizability of Twisted Chromophores in Polar Media. Journal of the American Chemical Society, 140(28), 8746-8755. https://doi.org/10.1021/jacs.8b04320

Unprecedented Large Hyperpolarizability of Twisted Chromophores in Polar Media. / Lou, Alexander J.T.; Righetto, Stefania; Barger, Christopher; Zuccaccia, Cristiano; Cariati, Elena; Macchioni, Alceo; Marks, Tobin J.

In: Journal of the American Chemical Society, Vol. 140, No. 28, 18.07.2018, p. 8746-8755.

Research output: Contribution to journalArticle

Lou, AJT, Righetto, S, Barger, C, Zuccaccia, C, Cariati, E, Macchioni, A & Marks, TJ 2018, 'Unprecedented Large Hyperpolarizability of Twisted Chromophores in Polar Media', Journal of the American Chemical Society, vol. 140, no. 28, pp. 8746-8755. https://doi.org/10.1021/jacs.8b04320
Lou AJT, Righetto S, Barger C, Zuccaccia C, Cariati E, Macchioni A et al. Unprecedented Large Hyperpolarizability of Twisted Chromophores in Polar Media. Journal of the American Chemical Society. 2018 Jul 18;140(28):8746-8755. https://doi.org/10.1021/jacs.8b04320
Lou, Alexander J.T. ; Righetto, Stefania ; Barger, Christopher ; Zuccaccia, Cristiano ; Cariati, Elena ; Macchioni, Alceo ; Marks, Tobin J. / Unprecedented Large Hyperpolarizability of Twisted Chromophores in Polar Media. In: Journal of the American Chemical Society. 2018 ; Vol. 140, No. 28. pp. 8746-8755.
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