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Isotopic Effect in Double Proton Transfer Process of Porphycene Investigated by Enhanced QM/MM Method

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Published on: July 19, 2019

Solid-state Porphyrin Interactions with Oppositely Charged Peripheral Groups.

W Robert Scheidt¹, Beisong Cheng¹, Allen G Oliver¹

¹Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA.

Journal of Porphyrins and Phthalocyanines

|August 23, 2016

Summary

This summary is machine-generated.

Researchers describe the crystal structure of a pair of oppositely charged porphyrins. These molecules form a tightly bound, one-dimensional stack stabilized by electrostatic and pi-pi interactions.

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Area of Science:

Supramolecular Chemistry
Crystal Engineering
Materials Science

Background:

Porphyrins are versatile macrocyclic compounds with diverse applications.
Understanding the self-assembly of charged porphyrins is crucial for designing novel materials.
Electrostatic and pi-pi interactions play key roles in molecular recognition and self-assembly.

Purpose of the Study:

To elucidate the crystal and molecular structure of a specific pair of oppositely charged porphyrins.
To investigate the stabilizing interactions within the assembled porphyrin structures.
To understand the formation of one-dimensional stacks in porphyrin assemblies.

Main Methods:

Crystallization of the porphyrin pair: tetra-anion 5,10,15,20-tetrakis-(4-sulfonatophenyl)-21,23H-porphyrin [H2TPPSO3]4- and tetra-cation 5,10,15,20-tetra(N-methylpyridyl)21H,23H-porphyrin [H2TMePyP]4+.
X-ray diffraction analysis to determine the crystal and molecular structure.
Analysis of intermolecular interactions, including electrostatic and pi-pi stacking.

Main Results:

The formation of an alternating one-dimensional stack of the tetra-anion and tetra-cation porphyrins.
Stabilization of the stack by strong electrostatic interactions between the oppositely charged porphyrin rings.
Additional stabilization provided by pi-pi interactions between the substituted phenyl rings of adjacent porphyrins.
Exceptionally tight packing and interactions within the porphyrin ensemble.

Conclusions:

The study successfully determined the crystal structure of a unique porphyrin pair.
Electrostatic and pi-pi interactions cooperatively drive the formation of stable, one-dimensional porphyrin stacks.
The findings provide insights into the rational design of self-assembled supramolecular structures based on porphyrins.