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Issue 40, 2012
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Nonlinear optical properties for a class of hexa-peri-hexabenzocoronene chromophores: a computational investigation

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Abstract

The systematic investigation of the linear and nonlinear optical properties on such a class of hexa-peri-hexabenzocoronene (HBC) chromophores is of significance for rationally designing two-photon absorption (TPA) materials. The results indicate that increasing the strength of electron-donating or accepting terminal groups leads to bathochromic-shift of the absorption band and enhancement of the TPA cross section (δmax). For the molecules with fluorinated methylene and cyano substituents, replacement of a double bond by a triple bond in the conjugated linker produces the increase of δmax, owing to the lower bond-length alternation and better rigidity of phenylene–ethynylene. In contrast, for the molecules with nitro groups, the similar replacement results in a slight decrease of δmax because N-HBC-E-NO2 has excellent planarity architecture and effective electronic coupling. The TPA spectra are red-shifted and the δmax values are enhanced as the number of branches increases. Thus, a solvatochromism effect has a positive influence on the TPA response of the nitryl compounds due to larger polarization of the nitro moiety. We have shed light on the linear relationship between the first hyperpolarizability and δmax. These HBC derivatives hold potential as high-performance nonlinear optical materials.

Graphical abstract: Nonlinear optical properties for a class of hexa-peri-hexabenzocoronene chromophores: a computational investigation

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Publication details

The article was received on 11 Jun 2012, accepted on 13 Aug 2012 and first published on 14 Aug 2012


Article type: Paper
DOI: 10.1039/C2DT31252B
Citation: Dalton Trans., 2012,41, 12416-12427
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    Nonlinear optical properties for a class of hexa-peri-hexabenzocoronene chromophores: a computational investigation

    X. Liu, J. Guo, A. Ren, S. Huang and J. Feng, Dalton Trans., 2012, 41, 12416
    DOI: 10.1039/C2DT31252B

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