Molecules 2009, 14(4), 1546-1560; doi:10.3390/molecules14041546
Article

Pseudo-cyclic Face-to-face Rigid Structure Caused by the Intramolecular Ion Pair Effect

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Received: 14 March 2009; in revised form: 9 April 2009 / Accepted: 10 April 2009 / Published: 14 April 2009
(This article belongs to the Special Issue Coumarins and Xanthones)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Six 3-methylpyridine zwitterions and six quinoline zwitterions were synthesized through the reaction of 4-hydroxycoumarins, p-benzoquinone and the corresponding N-aromatics. The novel pseudo-cyclic face-to-face rigid structure of the zwitterion was elucidated by 1H-NMR at different temperatures, and assumed to be caused by both the intramolecular ion pair attraction and the steric interaction.
Keywords: 4-Hydroxycoumarins; Zwitterion; Molecular structure
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MDPI and ACS Style

Zhang, S.-L.; Huang, Z.-S.; Gu, L.-Q. Pseudo-cyclic Face-to-face Rigid Structure Caused by the Intramolecular Ion Pair Effect. Molecules 2009, 14, 1546-1560.

AMA Style

Zhang S-L, Huang Z-S, Gu L-Q. Pseudo-cyclic Face-to-face Rigid Structure Caused by the Intramolecular Ion Pair Effect. Molecules. 2009; 14(4):1546-1560.

Chicago/Turabian Style

Zhang, Sheng-Ling; Huang, Zhi-Shu; Gu, Lian-Quan. 2009. "Pseudo-cyclic Face-to-face Rigid Structure Caused by the Intramolecular Ion Pair Effect." Molecules 14, no. 4: 1546-1560.

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