title: Synthesis and photophysical properties of three (multi)branched planar molecules.
abstract: Three thiophenevinyl substituted one-, two-, and three-branched truxene π-conjugated compounds TS1, TS2 and TS3 have been prepared using a Heck reaction. Their linear absorption, single- and two-photon excited fluorescence were examined. The three analogues emit blue fluorescence at 420 nm. The number of branches has no influence on the position of the absorption maxima of the charge transfer band and fluorescence emitting maxima. However, the molar extinction coefficients of charge transfer band increase almost linearly with the number of branches. The two-photon absorption cross-section of the octupolar three-branched compound TS3 is several times that of the two-branched compound TS2 and one-branched compound TS1.
authors.affiliation: College of Science, Northwest A&F University, Yangling 712100, PR China. yuanms@nwsuaf.edu.cn
authors.forename: Mao-Sen
authors.initials: MS
authors.lastname: Yuan
authors.forename: Qi
authors.initials: Q
authors.lastname: Fang
authors.forename: Yan-Rong
authors.initials: YR
authors.lastname: Zhang
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
mesh_terms: D005449:Fluorenes / Q000737:chemistry*; D005453:Fluorescence; D015394:Molecular Structure; D010777:Photochemistry; D017785:Photons; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013876:Thiophenes / Q000138:chemical synthesis / Q000737:chemistry*; D014753:Vinyl Compounds / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: C562370:2,7,12-tri(2-thiophenevinyl)-5,5',10,10',15,15'-hexaethyltruxene; C562369:2,7-di(2-thiophenevinyl)-5,5',10,10',15,15'-hexaethyltruxene; D005449:Fluorenes; D011108:Polymers; D013876:Thiophenes; D014753:Vinyl Compounds