Supramolecular Assemblies of Sulfur- and Selenium- Containing Expanded Porphyrins Mediated Through Noncovalent Interactions

Abstract

Various supramolecular assemblies based on expanded porphyrins building blocks containing sulfur and/or selenium in the core, formed through multiple non-covalent hydrogen bonding interactions are highlighted. Specifically, modified expanded porphyrins such as 22 π sapphyrins, 26 π rubyrins, and 34 π octaphyrins self assemble in solid state through C–H…O, C–H…N, C–H…S, C–H…Se, C–H…π, and C–H…Cl interactions to form dimeric, oligomeric, and three dimensional networks. Furthermore, the supramolecular networks promoted by trapped solvent molecules such as nitrobenzene and bound anions such as chloride or trifluoroacetate through noncovalent interactions will be discussed.

Keywords:

• Expanded porphyrins
• inverted porphyrins
• noncovalent interaction
• octaphyrin
• rubyrin
• sapphyrin

Acknowledgments

The work summarized in this account was supported by grants to TKC from Department of Science and Technology, New Delhi, India and Council of Scientific and Industrial Research, New Delhi, India. A large number of talented coworkers have significantly contributed to the work reported in this article. Our sincere thanks are to A. Srinivasan, B. Sridevi, S. J. Narayanan, Simi K. Pushpan, V. G. Anand, S. Nagendran, J. Sankar, Harapriya Rath and Rajeev Kumar.