Quinoxaline-based cross-conjugated luminophores: charge transfer, piezofluorochromic, and sensing properties. Issue 36 (30th August 2016)

• Record Type: Journal Article
• Authors: Chen, Yijing; Ling, Yuan; Ding, Lu; Xiang, Chunlan; Zhou, Gang
• Is Part Of: Journal of materials chemistry. Volume 4:Issue 36(2016)
• Page Start: 8496
• Page End: 8505
• Publication Date: 2016-08-30
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c6tc02945k
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Quinoxaline-based cross-conjugated luminophores have been constructed and their charge transfer, piezofluorochromic, and sensing properties have been systematically investigated. Abstract : A series of symmetrical cross-conjugated luminophores with different substituents at the 2, 3-positions of a quinoxaline unit have been designed and synthesized. Their intramolecular charge transfer (ICT), piezofluorochromic (PFC), and sensing properties have been systematically investigated. It can be found that four luminophores with the same conjugation backbone exhibit different ICT interactions between the electron-withdrawing quinoxaline unit and electron-donating triphenylamine units. Lippert–Mataga analysis reveals that luminophore1 without substituents displays the largest dipole moment difference between ground and excited states. Moreover, the target luminophores present reversible PFC properties due to the phase transitions between crystalline and amorphous states. The most remarkable piezofluorochromism is achieved for luminophore4 with pyridyl substituents. A bathochromic shift of 40 nm can be observed upon grinding the pristine sample. Furthermore, the target luminophores demonstrate selective and sensitive sensing properties to Fe 3+ ions. In addition, luminophore4 can also act as a colorimetric and fluorescent chemosensor for Ag + ions.