<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Synthesis and characterization of new bridged tolanes"^^ . "Approaches to novel diphenylacetylene derivatives and related compounds with restricted rotation of the phenyl rings have been developed. Since mutual overlapping of molecular orbitals specifies the electronic communication between aromatic π-systems, regulation of the conformation within a molecule gives control over conductive and photophysical properties of tolane. Amide- and ester bound tethers have been used. The first one resists aggressive factors better, compared with ester. Introduction of amide-functionalized tethers have been demonstrated by synthesis of two bridged tolanes; a novel double-bridged 1,4-bis(phenylethynyl)benzene (I) was prepared.\r\n\r\nIn addition, synthetic approaches leading to multi-gram amounts of bifunctional tolanophanes are shown, ready for further derivatization. TIPS-acetylene derivatives possessed not only outstanding emissive, but also interest-evoking structural properties, expressed in folded cyclic dimers with electronically interacting chromophore units by means of π-π-stacking. Considering this, series of cyclic oligomers have been synthesized and investigated.\r\n\r\nFrom previous studies it was known, that in the solid state twisted tolanophanes planarize after excitation due to a special arrangement of the electronic states. Introduction of the second tether into the tolanophane molecule gives a more rigid molecule (II) and leads to a better understanding of the emissive properties of tolane chromophores. Compound II showed a twisted conformation in the excited state.\r\nFigure I. Selected synthesized and studied molecules.\r\n\r\nFurther, bifunctional tolanophanes have been used for copolymerization (III). Bridged derivatives of 1,4-diphenyldiacetylene have been investigated, as they are usual defects in poly(para-phenyleneethynylene)s and can significantly affect their properties. Emissive ability of these substances appeared to be not distinct; they showed weak photophysical response on twisting."^^ . "2018" . . . . . . . "Yury"^^ . "Kozhemyakin"^^ . "Yury Kozhemyakin"^^ . . . . . . "Synthesis and characterization of new bridged tolanes (PDF)"^^ . . . "Dissertation_Kozhemyakin_Yury_PDF-A.pdf"^^ . . . "Synthesis and characterization of new bridged tolanes (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Synthesis and characterization of new bridged tolanes (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Synthesis and characterization of new bridged tolanes (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Synthesis and characterization of new bridged tolanes (Other)"^^ . . . . . . "small.jpg"^^ . . . "Synthesis and characterization of new bridged tolanes (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #25115 \n\nSynthesis and characterization of new bridged tolanes\n\n" . "text/html" . . . "540 Chemie"@de . "540 Chemistry and allied sciences"@en . .