Anion-directed self-assembly of coordination polymer into tunable secondary structure
SCIE
SCOPUS
- Title
- Anion-directed self-assembly of coordination polymer into tunable secondary structure
- Authors
- Kim, HJ; Zin, WC; Lee, M
- Date Issued
- 2004-06-09
- Publisher
- AMER CHEMICAL SOC
- Abstract
- A bent-shaped bipyridine ligand containing a dendritic aliphatic side chain has been synthesized as a ligand and complexed with silver ion through a self-assembling process. The resulting complexes were observed to self-assemble into supramolecular structures that differ significantly as a function of the counteranion size in the solid state, as confirmed by 1-D and 2-D X-ray diffraction experiments. The secondary structure of a cationic coordination chain appears to be dependent on the size of the counteranion. As the size of anion increases, the secondary structure of the coordination chain changes, from a helical chain, via a dimeric cycle, to a zigzag chain in the solid state. Interestingly, dilute solutions of the complexes exhibiting a columnar structure in polar solvents undergo spontaneous gelation and the resulting gels display a significant Cotton effect in the chromophore of the aromatic unit. These results represent a significant example that small variation in the anion size can provide a useful strategy to manipulate the secondary structure of linear chain and thereby solid-state supramolecular structure.
- Keywords
- NONBIOLOGICAL OLIGOMERS; ORGANIZATION; ARCHITECTURES; MESOPHASES; FOLDAMERS; COMPLEXES; FIBERS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/29774
- DOI
- 10.1021/JA049799V
- ISSN
- 0002-7863
- Article Type
- Article
- Citation
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 126, no. 22, page. 7009 - 7014, 2004-06-09
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