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@article{MOAMME19,
 abstract = {A new fluorene based fluorogenic chemosensor, 2-[(9H-Fluoren-2-ylmethylene)-amino]-phenol (L), has been designed, synthesized, and characterized by CHN analyses and different spectroscopic methods. This turn-on fluorogenic chemosensor shows high selectivity and sensitivity toward Cu2+ and CN$-$ with low detection limits of 1.54 $\times$ 10$-$9 M and 1.83 $\times$ 10$-$7 M, respectively. The stoichiometry ratio of L-Cu2+ in solution is 1:1, by the method of Job's plot and ESI-MS. The microcrystalline solid product of the chemosensor reaction with copper is characterized as CuL2. The \textgreek{q}T value for CuL2 is temperature independent at a value of 0.403 cm3 K mol$-$1, which is in agreement with a mononuclear copper(II) complex with an isotropic g-value of 2.075. The fluorescence turn-on recognition process for detection of Cu2+ is attributed to the restricted imine isomerization and blocking of intramolecular charge transfer (ICT) quenching process in the analyte-bound sensor. The selectivity of L for Cu2+ is based on the chelation-enhanced fluorescence effect (CHEF) mechanism. Other interfering ions such as Na+,K+,Ca2+,Mg2+,Ag+,Fe2+,Fe3+,Co2+,Ni2+,Zn2+,Cd2+,Hg2+,Mn2+,Pb2+ and Al3+, show no change in the fluorescence intensity of L in the presence of Cu2+. Furthermore, the compound L can be used as a fluorescence and colorimetric sensor for selective detection of CN$-$ over a number of other anions based on the nucleophilic addition to the imine C=N bond, with consequent hydrogen bond formation and electrostatic interaction of the resulting product with K+. The sensing mechanism for CN$-$ was theoretically supported by DFT calculations.},
 author = {{Nouri Moghadam}, Fariba and Amirnasr, Mehdi and Meghdadi, Soraia and Eskandari, Kiamars and Buchholz, Axel and Plass, Winfried},
 year = {2019},
 title = {A new fluorene derived Schiff-base as a dual selective fluorescent probe for Cu2+ and CN-},
 keywords = {CHEF effect;Cu2+ detection;Cyanide detection;DFT calculation;Fluorogenic dual sensor;Nucleophilic addition},
 pages = {6--15},
 volume = {207},
 journal = {Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy},
 doi = {10.1016/j.saa.2018.08.058}
}