Synthesis and optical properties of the isomeric pyrimidine and carbazole derivatives: Effects of polar substituents and linking topology
作者： Lina Skardziute , Jelena Dodonova , Andzejus Voitechovicius , Justina Jovaisaite , Regimantas Komskis
DOI: 10.1016/J.DYEPIG.2015.03.008
关键词: Intramolecular force 、 Pyrimidine 、 Excited state 、 Solvatochromism 、 Quantum yield 、 Suzuki reaction 、 Topology 、 Chemistry 、 Carbazole 、 Polarity (physics) 、 Photochemistry
摘要: Abstract A series of nonlinear oligoarylenes with a pyrimidine unit as central core and carbazole containing aryl branches in positions 2, 4 4, 6 the ring were successfully synthesized by sequential Suzuki coupling corresponding 2,4- or 4,6-dichloropyrimidines. Optical properties compounds thoroughly investigated media different polarity. Owing to pronounced electron-accepting core, donating groups showed expressed intramolecular charge transfer (ICT) character excited states, which was proved solvatochromic dynamics supported DFT calculations. ICT resulted dramatic enhancement state lifetime (up 5 times) increased solvent The competition constantly decreasing radiative nonradiative relaxation rates non-monotonous variation fluorescence quantum yield from 24% 74%. tailoring derivatives via altering linking topology polarity substituents is discussed.
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