Rumi, Mariacristina; Pond, Stephanie J. K.; Meyer-Friedrichsen, Timo; Zhang, Qing; Bishop, Maximilienne; Zhang, Yadong; Barlow, Stephen; Marder, Seth R.; Perry, Joseph W. published the artcile< Tetrastyrylarene Derivatives: Comparison of One- and Two-Photon Spectroscopic Properties with Distyrylarene Analogues>, Electric Literature of 112-63-0, the main research area is tetrastyrylarene derivative photon spectroscopic distyrylarene analog.
The 1-photon and two-photon absorption properties of cross-shaped chromophores consisting of four donor-substituted styryl branches linked to an aromatic core (benzene or pyrazine) were studied and compared with those of linear analogs with only two branches (donor-π-donor distryrylarenes). The areas of the lowest energy two-photon absorption bands of the compounds with four branches were less than twice those of analogs with two branches. The spectral features observed in these chromophores suggest that electronic coupling between the branches is effective but does not lead to significant enhancement of the two-photon cross section when the branches extend in more than one dimension. In a chromophore with two donor-substituted and two acceptor-substituted branches the two-photon cross section is smaller than in the corresponding linear analogs. The main characteristics of both the 1-photon and two-photon spectra of multibranched compounds discussed here can be explained qual. within the mol. exciton description. In contrast to the case of 1-photon absorptivities, the model shows that pure additivity of the two-photon absorption cross section should not be expected when two monomer units are coupled and that the cross section of the dimer depends on the relative orientation of the constituent units and on the strength and sign of the coupling interaction. In particular, the type of coupling effective in the four-branch chromophores presented here should result in a subadditivity of two-photon cross section of the monomers, in agreement with the exptl. findings.
Journal of Physical Chemistry C published new progress about Additivity (two-photon absorptivity sub-additivity and one-photon absorptivity). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Electric Literature of 112-63-0.
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