A pyrene-based highly selective turn-on fluorescent sensor for copper(II) ion and its application in live cell imaging

Shu-Pao Wu, Zhen-Ming Huang, Shi-Rong Liu, Peter Kun Chung
Journal of Fluorescence 2012, 22 (1): 253-9
A new pyrene derivative (chemosensor 1) containing a picolinohydrazide moiety exhibits high selectivity for Cu(2+) ion detection in mixed aqueous media (CH(3)OH:H(2)O = 7:3). Significant fluorescence enhancement was observed with chemosensor 1 in the presence of Cu(2+). However, the metal ions Ag(+), Ca(2+), Cd(2+), Co(2+), Cu(2+), Fe(2+), Fe(3+), Hg(2+), K(+), Mg(2+), Mn(2+), Ni(2+), Pb(2+), and Zn(2+) produced only minor changes in fluorescence for the system. The apparent association constant (K(a)) of Cu(2+) binding in chemosensor 1 was found to be 2.75*10(3) M(-1). The maximum fluorescence enhancement caused by Cu(2+) binding in chemosensor 1 was observed over the pH range 5-8. Moreover, by means of fluorescence microscopy experiments, it is demonstrated that 1 can be used as a fluorescent probe for detecting Cu(2+) in living cells.

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