Investigation of two-photon absorption properties in branched alkene and alkyne chromophores

    Authors

    A. Bhaskar; G. Ramakrishna; Z. K. Lu; R. Twieg; J. M. Hales; D. J. Hagan; E. Van Stryland;T. Goodson

    Comments

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    Abbreviated Journal Title

    J. Am. Chem. Soc.

    Keywords

    NONLINEAR-OPTICAL PROPERTIES; TIME-RESOLVED SPECTROSCOPY; EXCITATION-ENERGY TRANSFER; ORGANIC-MOLECULES; MULTIBRANCHED STRUCTURES; COOPERATIVE ENHANCEMENT; DATA STORAGE; ONE-PHOTON; PHOTOPHYSICAL; PROPERTIES; OCTUPOLAR MOLECULES; Chemistry, Multidisciplinary

    Abstract

    Novel alkene and alkyne branched structures have been synthesized, and their two-photon absorption (2PA) properties are reported. This series of alkene and alkyne trimer systems tests the mechanistic approach for enhancing the 2PA process which is usually dictated by the pi-bridging, delocalization length, and corresponding charge transfer on the 2PA cross sections. The results suggest that alkene branched systems have higher 2PA cross sections. While steady-state absorption and emission measurements were not successful in predicting the observed trend of 2PA cross sections, time-resolved measurements have explained the trends observed. It was found that, upon photoexcitation, there is an ultrafast charge localization to an intramolecular charge-transfer (ICT) state, followed by the presence of a solvent and conformationally relaxed ICT state ' in these branched systems.

    Journal Title

    Journal of the American Chemical Society

    Volume

    128

    Issue/Number

    36

    Publication Date

    1-1-2006

    Document Type

    Article

    Language

    English

    First Page

    11840

    Last Page

    11849

    WOS Identifier

    WOS:000240291900033

    ISSN

    0002-7863

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