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Folding of coordination polymers into double-stranded helical organization.

Authors
  • Kim, Ho-Joong
  • Lee, Eunji
  • Kim, Min Gyu
  • Kim, Min-Cheol
  • Lee, Myongsoo
  • Sim, Eunji
Type
Published Article
Journal
Chemistry (Weinheim an der Bergstrasse, Germany)
Publication Date
Jan 01, 2008
Volume
14
Issue
13
Pages
3883–3888
Identifiers
DOI: 10.1002/chem.200800056
PMID: 18393347
Source
Medline
License
Unknown

Abstract

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.

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