Journal
POLYHEDRON
Volume 28, Issue 1, Pages 69-76Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2008.10.011
Keywords
Self-assembly; Supramolecular chemistry; Helical structures; Silver; Zinc; N,O-ligands
Categories
Funding
- Turkish Scientific and Technical Research Council [TBAG-2450 (104T060)]
- UK Engineering and Physical Sciences Research Council
- National Science Council of Taiwan [95-2113-M-032-007]
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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 center dot center dot center dot 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. (C) 2008 Elsevier Ltd. All rights reserved
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