Essential-State Model for Polymethine Dyes: Symmetry Breaking and Optical Spectra

    Authors

    F. Terenziani; O. V. Przhonska; S. Webster; L. A. Padilha; Y. L. Slominsky; I. G. Davydenko; A. O. Gerasov; Y. P. Kovtun; M. P. Shandura; A. D. Kachkovski; D. J. Hagan; E. W. Van Stryland;A. Painelli

    Comments

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    Abbreviated Journal Title

    J. Phys. Chem. Lett.

    Keywords

    CONJUGATED POLYMERS; ABSORPTION; CHROMOPHORES; SOLVATOCHROMISM; DISTORTION; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary; Physics, Atomic, Molecular & Chemical

    Abstract

    Optical spectra of two families of symmetrical polymethine dyes bearing a positive and a negative charge are analyzed based on an essential state model recently developed for quadrupolar dyes. The model accounts for molecular vibrations and polar solvation and reproduces the anomalous evolution with solvent polarity of experimental absorption band shapes. Fluorescence and excited-state absorption spectra are well-described within the samle model which also quantitatively reproduces the recent observation of an intense two-photon absorption toward the (two-photon forbidden) lowest excited state. An extensive analysis of optical spectra demonstrates that the essential-state model developed for quadrupolar dyes also applies to polymethine dyes and that long polymethine dyes offer the first experimental example of class III quadrupolar chromophores.

    Journal Title

    Journal of Physical Chemistry Letters

    Volume

    1

    Issue/Number

    12

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    1800

    Last Page

    1804

    WOS Identifier

    WOS:000278963500010

    ISSN

    1948-7185

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