title: A novel rhodamine-benzimidazole conjugate as a highly selective turn-on fluorescent probe for Fe(3+).
abstract: In this manuscript, a novel probe RHBI based on the rhodamine-benzimidazole conjugate was designed and synthesized. RHBI showed an extreme selectivity for Fe(3+) over other metal ions such as Pb(2+), Ni(2+), Co(2+), Mn(2+), Zn(2+), Hg(2+), Cd(2+), Ag(+), Mg(2+), Ca(2+), Ba(2+), Na(+) and K(+) in acetonitrile. Upon the addition of 10 equiv. of Fe(3+), a 1098-fold fluorescence intensity enhancement was observed at the maximum emission wavelength of 582 nm. Both the Job's plot and ESI-MS showed that RHBI coordinated with Fe(3+) in a 1:1 stoichomitry and the calculated binding constant was 1.01 × 10(4) M(-1). The competition experiment for Fe(3+) ions mixed with other metal ions exhibited no obvious change except Cu(2+) that could induce a mild fluorescence quenching. Moreover, the fluorescence emission increased linearly with the Fe(3+) concentration in the range of 6 × 10(-6)-4 × 10(-5) M and the detection limit was 1.5 × 10(-8) M.
authors: Hubei Novel Reactor & Green Chemical Technology Key Laboratory, Key Laboratory for Green Chemical Process of Ministry of Education, Wuhan Institute of Technology, 693 Xiongchu Avenue, Wuhan, Hubei Province 430074, People's Republic of China.
authors: Junbo
authors: J
authors: Li
authors: Qihui
authors: Q
authors: Hu
authors: Xianglin
authors: X
authors: Yu
authors: Yang
authors: Y
authors: Zeng
authors: Cancan
authors: C
authors: Cao
authors: Xiwen
authors: X
authors: Liu
authors: Jia
authors: J
authors: Guo
authors: Zhiquan
authors: Z
authors: Pan
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