Abstract
A highly sensitive and selective fluorescence sensor for the detection of Zn2+ and Cu2+ was derived from a Salamo-type bisoxime ligand. The developed sensor is capable of detecting Zn2+ and Cu2+ in aqueous media through fluorescence turn on and off, respectively. In addition, the complexes of Zn2+ and Cu2+ could successfully sense the presence of H+/OH− via increase (ON)/decrease (OFF) in fluorescence intensity. Single crystal structures of Cu2+, Ni2+ and Cd2+ complexes have been characterized using X-ray crystallography, respectively. The Cu2+ complex forms a dinuclear structure with both Cu2+ being five-coordinated with square pyramidal geometries; the Ni2+ and Cd2+ complexes are both tetranuclear structures where the Ni2+ and Cd2+ are almost six-coordinated with slightly distorted octahedral geometries. More specifically, one of the Cd2+ forms a novel six-coordinated triangular prism geometry which is rarely reported.
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