Multi-branched triphenylamine-rhodamine derivatives: synthesis and fluorescent sensing for Cu2+ and Hg2+ ions.
Three multi-branched rhodamine based fluorescent probes TPARH1-3 have been designed and synthesized by incorporating the rhodamine fluorophore with triphenylamine. The probe TPARH1 displayed high sensitivity to Cu(2+) in aqueous CH3CN. The probes TPARH2 and TPARH3 showed high sensitivity towards Hg(2+) in aqueous EtOH medium as reflected by their signalling responses. The cooperative effects of multi-branched structures towards metal ions were carried out by UV-vis absorption titrations and time scanning fluorescence spectroscopic. In addition, the binding mode was proposed based on the job's plot. The absorption of probes 1-3 at 558 nm went through a maximum at a molar fraction of 0.5, indicating a 1:1 stoichiometry of the Hg(2+) to 1, 2 and 3 in the complex, respectively.
State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, PR China; University of Chinese Academy of Sciences, Beijing 100039, PR China.
Yang
Y
Yang
Bin
B
Li
Liming
L
Zhang
Peng
P
Li
Hong
H
Jiang
D000097:Acetonitriles; D002413:Cations, Divalent; D003300:Copper / Q000032:analysis*; D000431:Ethanol; D005456:Fluorescent Dyes / Q000737:chemistry*; D008628:Mercury / Q000032:analysis*; D012235:Rhodamines / Q000737:chemistry*; D012996:Solutions; D013050:Spectrometry, Fluorescence; D014867:Water; D014874:Water Pollutants, Chemical / Q000032:analysis*
D000097:Acetonitriles; D002413:Cations, Divalent; D005456:Fluorescent Dyes; D012235:Rhodamines; D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D000431:Ethanol; D003300:Copper; D008628:Mercury
Cu(2+); Fluorescent probe; Hg(2+); Rhodamine; Spirolactam; Triphenylamine