Development and Applications of Fluorescent Indicators for Mg2+ and Zn2+
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- 作者：Lina Wang ; Wenwu Qin ; Xiaoliang Tang ; Wei Dou ; Weisheng Liu
- 刊名：Journal of Physical Chemistry A
- 出版年：2011
- 出版时间：March 10, 2011
- 年：2011
- 卷：115
- 期：9
- 页码：1609-1616
- 全文大小：1139K
- 年卷期：v.115,no.9(March 10, 2011)
- ISSN：1520-5215
文摘
In a study of the spectroscopic behavior of two Schiff base derivatives, salicylaldehyde salicylhydrazone (1) and salicylaldehyde benzoylhydrazone (2), Schiff base 1 has high selectivity for Zn2+ ion not only in abiotic systems but also in living cells. The ion selectivity of 1 for Zn2+ can be switched for Mg2+ by swapping the solvent from ethanol鈭抴ater to DMF (N,N-dimethylformamide)鈭抴ater mixtures. Imine 2 is a good fluorescent probe for Zn2+ in ethanol鈭抴ater media. Many other ions tested, such as Li+, Na+, Al3+, K+, Ca2+, Cr3+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Ag+, Cd2+, Sn2+, Ba2+, Hg2+, and Pb2+, failed to induce any spectral change in various solvents. The selectivity mechanism of 1 and 2 for metal ions is based on a combinational effect of proton transfer (ESPT), C鈺怤 isomerization, and chelation-enhanced fluorescence (CHEF). The coordination modes of the complexes were investigated.