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Folding of Coordination Polymers into Double‐Stranded Helical Organization
Author(s) -
Kim HoJoong,
Lee Eunji,
Kim Min Gyu,
Kim MinCheol,
Lee Myongsoo,
Sim Eunji
Publication year - 2008
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200800056
Subject(s) - crystallography , supramolecular chemistry , polymer , metal , ligand (biochemistry) , bent molecular geometry , folding (dsp implementation) , bridging ligand , materials science , coordination polymer , density functional theory , chemistry , computational chemistry , crystal structure , biochemistry , receptor , electrical engineering , engineering , metallurgy , composite material
Self‐assembling coordination polymers based on Pd II and Cu II metal ions were prepared from complexation of a bent‐shaped bispyridine ligand and a corresponding transition metal. These coordination polymers were observed to self‐assemble into supramolecular structures that differ significantly depending on the coordination geometry of the metal center. The polymer based on Pd II self‐assembles into a layer structure formed by bridging bispyridine ligands connected in a trans ‐position of the square‐planar coordination geometry of metal center. In contrast, the polymer based on Cu II adopts a double‐helical conformation with regular grooves, driven by interstranded, copper–chloride dimeric interaction. The double‐stranded helical organization is further confirmed by structure optimization from density functional theory with aromatic framework, showing that the optimized double‐helical structure is energetically favorable and consistent with the experimental results. These results demonstrate that weak metal–ligand bridging interactions can provide a useful strategy to construct stable double‐stranded helical nanotubes.