Spectroscopic and structural properties of complexes of 3,3'-bis(2-benzimidazolyl)-2,2'-bipyridine with copper(I) and silver(I)

Şengül, Abdurrahman, Kurt, Özgür, Adler, Philip David Felix and Coles, Simon J. (2014) Spectroscopic and structural properties of complexes of 3,3'-bis(2-benzimidazolyl)-2,2'-bipyridine with copper(I) and silver(I). Journal of Coordination Chemistry, 67 (14), 2365-2376. (doi:10.1080/00958972.2014.943201).

Abstract

The pseudo-tetrahedral complexes [CuL₂]PF₆ · 7H₂O · CH₃OH (1) and [AgL₂]CF₃SO₃ · H₂O (2) (L = 3,3'-bis(2-benzimidazolyl)-2,2'-bipyridine) have been synthesized and characterized through crystal structure analyses, electrochemistry, and spectroscopic methods. X-ray structural analyses of 1 and 2 indicate that sterically constrained N₄ ligands L are cis and behave as bidentate chelates to a single metal ion in a pseudo-tetrahedral fashion through the benzimidazole. As two benzimidazolyl rings exhibit considerable steric hindrance, the bipyridine unit of L remains uncoordinated. The pseudo-tetrahedral cation [CuL₂]⁺ shows a quasi-reversible Cu^I/Cu^II oxidation-reduction wave in the CV in DMF (counter-ion PF₆^-). The fluorescence titration of L with copper(I), silver(I), and also with pH have been conducted to examine the selectivity. The ligand shows remarkably high selectivity and sensitivity for Ag(I)

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Contributors

Author: Simon J. Coles

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