Influence of Weaker Interactions on the Self-Assembly of Rigid Molecular Scaffolds Based on Tetraarylbimesityls
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- 作者：Jarugu Narasimha Moorthy ; Ramalingam Natarajan ; Govardhan Savitha ; and Paloth Venugopalan
- 刊名：Crystal Growth & Design
- 出版年：2006
- 出版时间：April 2006
- 年：2006
- 卷：6
- 期：4
- 页码：919 - 924
- 全文大小：587K
- 年卷期：v.6,no.4(April 2006)
- ISSN：1528-7505
文摘
We have explored how weak interactions would manifest in three-dimensional (3D) rigid scaffolds based ontetrarylbimesityls in which the close packing is likely to be more decisive. While the crystal structure of tetrapyridyl bimesityl(3,3',5,5'-tetrakis(4-pyridyl)bimesityl, 2) is found to be a close-packed one devoid of any perceptible interactions, that of 3,3',5,5'-tetrakis(3-pyridyl)bimesityl (1) is found to reveal a novel ring motif based on C-H···N hydrogen bonds, which serves to organizethe molecules into a cubic 
-Po-like network. The cyano-substituted derivative (3,3',5,5'-tetrakis(4-cyanophenyl)bimesityl, 3) isfound to exhibit a helical organization as a result of C-H···N interactions and electrophile-nucleophile type pairing. Evidently, theinteractions due to groups that interact weakly appear to be exploited in the crystal packing of 3D scaffolds only when their existencecan be accommodated by a molecular packing that leads to overall crystal lattice stabilization as in 1 and 3. The crystal structuresof 1 and 2 suggest a strong dependence on the location of weakly interacting sites. In the crystal structures of 3D rigid scaffolds,the close packing appears to dictate the manifestation or otherwise of the weak interactions and their association patterns/motifs.
-Po-like network. The cyano-substituted derivative (3,3',5,5'-tetrakis(4-cyanophenyl)bimesityl, 3) isfound to exhibit a helical organization as a result of C-H···N interactions and electrophile-nucleophile type pairing. Evidently, theinteractions due to groups that interact weakly appear to be exploited in the crystal packing of 3D scaffolds only when their existencecan be accommodated by a molecular packing that leads to overall crystal lattice stabilization as in 1 and 3. The crystal structuresof 1 and 2 suggest a strong dependence on the location of weakly interacting sites. In the crystal structures of 3D rigid scaffolds,the close packing appears to dictate the manifestation or otherwise of the weak interactions and their association patterns/motifs.