Ethynylene-linked Figure-Eight Octaphyrin(1.2.1.1.1.2.1.1): Synthesis and Characterization of Its Two Oxidation
Krushna Chandra Sahoo1, Marcin A Majewski2, Marcin Stępień2
1Department of Inorganic Chemistry, Indian Association for the Cultivation of Science , 2A/2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India.
Abstract:
An octaphyrin(1.2.1.1.1.2.1.1) containing two conjugated ethynylene bridges has been synthesized and characterized. The macrocycle reveals complex conformational dynamics dependent on its protonation and oxidation state. The [40]annulenoid macrocycle and its [38]annulenoid oxidized form display residual macrocyclic ring currents. In spite of its low apparent aromaticity the new octaphyrin is a potent chromophore with a vis-NIR absorption profile strongly influenced by the redox and acid-base chemistry.
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