Hydrogen Bonds Involving Cavity NH Protons Drives Supramolecular Oligomerization of Amido-Corroles

Chemistry : a European Journal
Rafał OrłowskiDaniel T Gryko

Abstract

trans-A2 B-Corroles with amide substituents at different positions versus the macrocyclic core have been synthesized. Their self-organizing properties have been comprehensively evaluated both in solid-state and in solution. The rigid arrangement of the amide functionality with the corrole ring led to the formation of strong intramolecular interactions and precluded intermolecular interactions. Replacement of sterically hindered C6 F5 substituents at positions 5 and 15 with smaller electron-withdrawing CO2 Me groups resulted in significant changes in the self-assembly pattern. With these substituents, tetramers formed in a crystalline state, in which one of the H-pyrrole subunits is out of the corrole plane. This allows the N-H group to form a hydrogen bond with a neighboring carbonyl group of the n-butyl amide fragment. DOSY NMR studies showed that amido-corroles bearing the OCH2 CONHnBu motif formed dimers in millimolar solutions in nonpolar solvents and the dimers existed in equilibrium with monomers. However, the corroles possessing meso-ester groups did not form dimers in polar tetrahydrofuran. Comprehensive optical studies allowed the absorption and emission features of the monomer corroles to be characterized in dilute so...Continue Reading

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Citations

Apr 17, 2019·Chemistry : a European Journal·Rafał OrłowskiDaniel T Gryko
Mar 13, 2021·Photosynthesis Research·John A ClarkValentine I Vullev
Mar 13, 2021·Proceedings of the National Academy of Sciences of the United States of America·Rafał OrłowskiDaniel T Gryko

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