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Chemical Oxidation Induced Aromaticity Switching of E-Ethylene Bridged [38] Octaphyrin (1.2.1.0.1.2.1.0) with NIR
Sumit Sahoo1, Pallab Chatterjee1, Daniel Blasco2
1School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A/2B Raja S.C Mullick Road, Jadavpur, Kolkata, West Bengal 700 032, India.
Abstract:
We report the syntheses, spectroscopic analyses, and solid-state structural evidence of a quasi-planar aromatic [38] E-ethylene bridged octaphyrin (1.2.1.0.1.2.1.0) exhibiting NIR absorption. The chemical oxidation using an appropriate oxidant led to unique π reconstruction via amine-imine conversion and/or C-oxygenation of the inverted thiophene rings resulting in weakly antiaromatic or nonaromatic [36] octaphyrins with preserved E-conformation of the ethylene moieties. The aromatic nature of the studied octaphyrins is supported by GIMIC calculations of the magnetically induced ring current density.
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