A Comparative Study of Aromaticity in Substituted Tetracyclic and Hexacyclic Thiophenes

Thomas, S and Pati, YA (2010) A Comparative Study of Aromaticity in Substituted Tetracyclic and Hexacyclic Thiophenes. In: Journal of Physical Chemistry A, The, 114 (18). pp. 5940-5946.

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Abstract

We have studied the nature of aromaticity in expanded porphyrinic analogues of thiophenes formed by four and six thiophenes. Using density functional theory (DFT) we have analyzed the aromaticity of both the macrocycle and individual molecular fragments. We find paramagnetic annulenic ring currents in the case of tetracyclic molecules and diamagnetic annulenic ring currents for hexacyclic molecules. We have also studied the effect of substitution of benzene rings within the macrocycle. We find that as the number of benzene rings is increased the aromaticity increases for tetracyclic systems and decreases for hexacyclic systems. All the results have been analyzed with various microscopic parameters, including geometry, excitation gap, and NMR criteria.

Item Type:	Journal Article
Publication:	Journal of Physical Chemistry A, The
Publisher:	American Chemical Society
Additional Information:	Copyright of this article belongs to American Chemical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	15 Jul 2010 05:43
Last Modified:	19 Sep 2010 06:10
URI:	http://eprints.iisc.ac.in/id/eprint/28881

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