2134/32670 Chuan-Zeng Wang Chuan-Zeng Wang Xing Feng Xing Feng Zannatul Kowser Zannatul Kowser Chong Wu Chong Wu Thamina Akther Thamina Akther Mark Elsegood Mark Elsegood Carl Redshaw Carl Redshaw Takehiko Yamato Takehiko Yamato Pyrene-based color-tunable dipolar molecules: Synthesis, characterization and optical properties Loughborough University 2018 Regioselective synthesis Pyrene chemistry K-region Tunable emission Dipolar molecules Chemical Sciences not elsewhere classified 2018-04-23 08:19:45 Journal contribution https://repository.lboro.ac.uk/articles/journal_contribution/Pyrene-based_color-tunable_dipolar_molecules_Synthesis_characterization_and_optical_properties/9394424 © 2018 Elsevier Ltd A controllable regioselective approach to achieve dipolar functionalization at the active sites (1,3-positions) and K-region (5,9-positions) of pyrene is demonstrated. Following this strategy, a set of dipolar 1,3-diphenyl-5,9-di(4-R-phenylethynyl)pyrenes were synthesized and systematically investigated by 1 H/ 13 C NMR spectroscopy, X-ray crystallography, electronic spectra, as well as by theoretical calculations. By adjusting the substituents at the 5,9-positions of pyrene, the pyrene-based dipolar molecules 4 (H, F, OMe, CN, CHO, NMe 2 ) exhibit tunable optical properties with a wide emission band from blue (437 nm) to orange-red (571 nm).