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A new podand-type receptor for Na detection has been synthesized by connecting two 1pyrenecarbonylmethyl groups with two hydroxy groups of 2,2’-dihydroxydiphenyl ether. With the addition of Na in the range of 20-200 μM, the increasing monomer emission (423 nm) and the decreasing excimer emission (524 nm) of pyrene were observed. In contrast with the receptor, the fluorescence spectra of the corresponding compound obtained from 2,2’dihydroxydiphenylmethane are only slightly affected by the addition of Na.

Effective Na+ fluorescent sensing by new podand-type receptor connecting two pyrene units and diphenyl ether