title: Two hexaazatriphenylene based selective off-on fluorescent chemsensors for cadmium(II).
abstract: Two hexaazatriphenylene (HAT) derivatives, 2,3,6,7-tetramethyl-10,11-di(pyridin-2-yl)dipyrazino[2,3-f:2',3'-h]quinoxaline (1) and 2,3-dimethyl-6,7,10,11-tetra(pyridin-2-yl)dipyrazino[2,3-f:2',3'-h]quinoxaline (2), were designed and synthesized. Both 1 and 2 exhibited high off-on fluorescent selectivity for Cd(2+) over many other metal ions, and the detection limits were determined to be 0.6 and 5.0 μM, respectively. The stoichiometry and coordination mode of blue fluorescent 1-Cd(2+) and cyan fluorescent 2-Cd(2+) were determined with fluorescence titration fit, Job's plot analysis, (1)H NMR titration and X-ray crystallography, and the fluorescence enhancement mechanism was analyzed with density functional theory calculation.
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, PR China; Tianjin Key Laboratory on Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300071, PR China.
authors.forename: Xiao-Hong
authors.initials: XH
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, PR China; Tianjin Key Laboratory on Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300071, PR China.
authors.forename: Chuan-Fang
authors.initials: CF
authors.lastname: Zhao
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, PR China; Tianjin Key Laboratory on Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300071, PR China. Electronic address: liyue84@nankai.edu.cn.
authors.forename: Yue
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, PR China; Tianjin Key Laboratory on Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300071, PR China.
authors.forename: Xiu-Ming
authors.initials: XM
authors.lastname: Liu
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, PR China; Tianjin Key Laboratory on Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300071, PR China.
authors.forename: Ao
authors.initials: A
authors.lastname: Yu
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, PR China; Tianjin Key Laboratory on Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300071, PR China. Electronic address: wjruan@nankai.edu.cn.
authors.forename: Wen-Juan
authors.initials: WJ
authors.lastname: Ruan
authors.affiliation: Department of Chemistry, Nankai University, Tianjin 300071, PR China; Tianjin Key Laboratory on Metal and Molecule-Based Material Chemistry, Nankai University, Tianjin 300071, PR China.
authors.forename: Xian-He
authors.initials: XH
authors.lastname: Bu
mesh_terms: D002104:Cadmium / Q000032:analysis*; D018360:Crystallography, X-Ray; D005456:Fluorescent Dyes / Q000737:chemistry*; D006576:Heterocyclic Compounds, 4 or More Rings / Q000737:chemistry*; D057230:Limit of Detection; D009682:Magnetic Resonance Spectroscopy; D011810:Quinoxalines / Q000737:chemistry*
chemical_list: D005456:Fluorescent Dyes; D006576:Heterocyclic Compounds, 4 or More Rings; D011810:Quinoxalines; D002104:Cadmium
keywords: Cd(2+) ion; Chemsensor; Hexaazatriphenylene; Off–On