A novel dinuclear double-stranded helical complexes of bis(terdentate) N4O2 donor ligand with silver(I) and zinc(II) d10 metal ions

Şengül, Abdurrahman, Wang, Wen-Jwu and Coles, Simon J. (2009) A novel dinuclear double-stranded helical complexes of bis(terdentate) N4O2 donor ligand with silver(I) and zinc(II) d10 metal ions. Polyhedron, 28 (1), 69-76. (doi:10.1016/j.poly.2008.10.011).

Abstract

Reaction of the hexadentate N₄O₂-donor ligand 6,6'-bis(3-hydrazonobutan-2-one)-2,2'-bipyridine (L) with Ag((I)) and Zn((II)) affords a dinuclear double stranded helicate species [Ag₂L₂]²⁺ (1a) and [Zn₂L₂]²⁺ (1b), in which partitioning of the ligand into two bis-tridentate pyridyl-ketoimine chelating units allow each ligand to bridge both metal centres. X-ray crystallography, ESI-MS and UV-Vis spectrophotometric titration experiments reveal that the complex (1a) retains its solid-state structure in solution. The crystal structure of(1a) provides the first example of dinuclear silver(I) complex in which both of the metal centres can be approximated as a seven coordinate distorted mono-capped trigonal prism in which the Ag ••• Ag close contact of 3.034(4) angstrom is taken into account and forms the cap. The counter-ions do not interact with metal centres but hydrogen bond to N-H protons of the hydrazonic arms from the separate strands. The adjacent helical units are cross-linked together via NH center dot center dot center dot O(keto) hydrogen bonding to maintain the supramolecular structure.

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Contributors

Author: Simon J. Coles

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