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Published on: October 18, 2018
Topological Diversity in Electrochemically Active Core-Modified Expanded Porphyrinoids
Hosahalli S Udaya1, Vishnu Mishra1, Tullimilli Y Gopalakrishna1
1Department of Chemistry, Indian Institute of Science Education and Research, Pune, Maharashtra 411008, India.
Abstract:
Thiophene-based expanded porphyrinoids undergo a transition from a planar conformation to a twisted conformation upon a systematic increase in the number of thiophene units. Octaphyrin, with 40π electrons, displayed temperature-dependent interconversion between planar and nonplanar conformations in the solution state, in contrast to the rigid planar conformation in the solid state. 60π-dodecaphyrin and 70π-tetradecaphyrin have the maximum number of π-electrons for 12- and 14-heterocycle porphyrinoids, respectively. Spectro-electrochemical measurements confirmed facile reversible two-electron oxidation and the unstable radical cation intermediate in these systems.
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