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Updated: Mar 19, 2026

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
Published on: February 10, 2023
[40]π Fused and Nonfused Core-Modified Nonaphyrins: Syntheses and Structural Diversity
Arindam Ghosh1, A Srinivasan1, Cherumuttathu H Suresh2
1School of Chemical Sciences, National Institute of Science Education and Research (NISER), Bhubaneswar -, 751005, Odisha, India.
Abstract:
The synthesis of fused and nonfused core-modified 40π nonaphyrins are reported. Spectroscopic and X-ray structural studies reveal a twisted figure-eight conformation in the freebase form that is nonaromatic. Structural changes occur, from figure-eight to open extended conformation, upon protonation, thereby adopting 4nπ Hückel antiaromatic character, which is reflected in spectroscopic and theoretical studies. Such a structural change also induces ring inversions of specific heterocyclic rings by 180°.
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