title: Synthesis, Luminescent Properties of aza-Boron-Diquinomethene Difluoride Complexes and Their Application for Fluorescent Security Inks.
abstract: Two aza-boron-diquinomethene (aza-BODIQU) complexes bearing phenyl and carbazyl substituents were synthesized and characterized. Their photophysical properties were investigated systematically via spectroscopic and theoretical methods. Both complexes exhibit strong (1)π-π* transition absorptions (λ(abs) = 400-540 nm) and intense fluorescent emissions (λ(em) = 440-600 nm, Φ(PL) = 0.93 and 0.78) in CH2Cl2 solution and in solid state at room temperature. Compared to the complex with phenyl groups, the complex bearing carbazyl groups shows significant bathochromic shift in both absorption and emission. This could be attributed to the larger π-electron conjugation of the carbazole unit and intramolecular charge transfer feature from carbazole to aza-BODIQU component. In addition, the complexes exhibit intense photoluminescence and good stability on antacid, anti-alkali and stability in printing ink samples, which makes them potential dopants for the application of fluorescent security inks.
authors.affiliation: Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 210009, China.
authors.forename: Long
authors.initials: L
authors.lastname: Gu
authors.affiliation: Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 210009, China. rui.liu@njtech.edu.cn.
authors.forename: Rui
authors.initials: R
authors.lastname: Liu
authors.affiliation: Jiangsu Vocational College of Information Technology, Wuxi, 214153, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Shi
authors.affiliation: Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 210009, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 210009, China.
authors.forename: Guangliang
authors.initials: G
authors.lastname: Song
authors.affiliation: Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 210009, China.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Zhu
authors.affiliation: Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, 200083, China.
authors.forename: Shidong
authors.initials: S
authors.lastname: Yuan
authors.affiliation: Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, 210009, China. zhuhj@njtech.edu.cn.
authors.forename: Hongjun
authors.initials: H
authors.lastname: Zhu
mesh_terms: D001372:Aza Compounds / Q000138:chemical synthesis* / Q000494:pharmacology*; D001896:Boron Compounds / Q000737:chemistry*; D004396:Coloring Agents / Q000138:chemical synthesis* / Q000494:pharmacology*; D007281:Ink; D049449:Luminescence; D011789:Quantum Theory; D011804:Quinolines / Q000138:chemical synthesis* / Q000494:pharmacology*
chemical_list: D001372:Aza Compounds; D001896:Boron Compounds; D004396:Coloring Agents; D011804:Quinolines; C000612623:aza-boron-diquinomethene; C579460:boron difluoride
keywords: Aza-boron-diquinomethene; Carbazole; Difluoride complex; Fluorescent security ink; Photoluminescence; Synthesis