Synthesis of Novel Bis-Benzimidazolyl Podands: A new Chemosensor for Cu۲+

Some new compounds based on bis-benzimidazole moieties have been synthesized and characterized by IR and NMR spectroscopies. The ability of ۳a in transition metal cation sensing such as Co۲+, Ni۲+, Zn۲+, Mn۲+, Fe۲+ and Cu۲+ have been investigated by Uv-vis and fluorescence spectroscopy in methanol solvent. The complexation constants and complex stoichiometry of Cu۲+ have been determined. The experimental result show that ۳a exhibits high selectivity toward Cu۲+ cation in a ۱:۱ complex stoichiometry. The absorption bond and the fluorescence intensity have been increased by addition of successive amount of Cu۲+ solution in methanol. Therefore, these results demonstrate that, the compound can be used as a sensor to detect Cu۲+ cation via absorption and emission spectroscopy.

Keywords:

Chemosensor , Fluorescence , UV-Vis spectroscopy , Cu۲+