The nonlinearproperties and the photophysical behavior of two π‐conjugated chromophores that incorporate an electron‐deficient pyrimidine core (A) and γ‐methylenepyrans as terminal donor (D) groups have been thoroughly investigated. Both dipolar and quadrupolar branching strategies are explored and rationalized on the basis of the Frenkel exciton model. Even though a cooperative effect is clearly
chromatography. The cyclobutane structure of 2c and 2d was β-type homo adduct whereas that of 2e was β-type hetero adduct. As only one type of adduct was detected for each crystal, photodimerization was interpreted as being of a crystal lattice controlled process. The conversions of these reactions were not as high as that of the reaction in α-type of 2,5-distyrylpyrazine (DSP). The lower conversion was
Synthesis and Characterization of Novel <i>para</i>- and <i>meta</i>-Phenylenevinylene Derivatives: Fine Tuning of the Electronic and Optical Properties of Conjugated Materials
作者:L. Pascal、J. J. Vanden Eynde、Y. Van Haverbeke、P. Dubois、A. Michel、U. Rant、E. Zojer、G. Leising、L. O. Van Dorn、N. E. Gruhn、J. Cornil、J. L. Brédas
DOI:10.1021/jp025748d
日期:2002.6.1
We report the synthesis of novel phenylenevinylene derivatives that allow for the introduction of meta versus para connections on the phenylene rings, as well as the incorporation of nitrogen atoms within the conjugated backbone and the attachment of electroactive substituents. We assess the impact of the various derivatization schemes on the electronic and optical properties by means of gas-phase