title: Synthesis of highly luminescent cobalt(II)-bis(8-hydroxyquinoline) nanosheets as isomeric aromatic amine probes.
abstract: Highly luminescent and water-soluble cobalt(ii)-bis(8-hydroxyquinoline) (CoQ(2)) nanosheets have been successfully synthesized via a simple, rapid sonochemical method. The water-soluble CoQ(2) nanosheets were characterized by luminescence spectroscopy, UV-vis spectroscopy, FT-IR spectroscopy and transmission electron microscopy (TEM). The CoQ(2) nanosheets allow highly sensitive and selective determination of p-nitroaniline via fluorescence quenching. Under optimal conditions, the relative fluorescence intensities of nanosheets decreased linearly with increasing p-nitroaniline. However, the sensitivity of CoQ(2) nanosheets toward other aromatic amines including o-diaminobenzene, m-diaminobenzene, p-diaminobenzene, p-toluidine, o-nitroaniline, m-nitroaniline, p-chloroaniline and aniline is negligible. It is found that p-nitroaniline can quench the luminescence of CoQ(2) nanosheets in a concentration-dependent manner that is best described by a Stern-Volmer-type equation. The possible underlying mechanism is discussed.
authors.affiliation: Key Laboratory of Pesticide & Chemical Biology (CCNU), Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, PR China. lhbing@mail.ccnu.edu.cn
authors.forename: Haibing
authors.initials: H
authors.lastname: Li
authors.forename: Yuling
authors.initials: Y
authors.lastname: Li
mesh_terms: D000588:Amines / Q000032:analysis* / Q000737:chemistry; D000814:Aniline Compounds / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007536:Isomerism; D046529:Microscopy, Electron, Transmission; D049329:Nanostructures / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry; D015125:Oxyquinoline / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water; D014961:X-Ray Diffraction
chemical_list: D000588:Amines; D000814:Aniline Compounds; D056831:Coordination Complexes; D009942:Organometallic Compounds; C553085:cobalt(II)-bis(8-hydroxyquinoline); D014867:Water; C008625:nitroaniline; D003035:Cobalt; D015125:Oxyquinoline