Molecular Recognition and Atropisomerization of [5,10,15,20-Tetrakis(1-pentyl-3-pyridinio)porphyrinato]zinc(II) in Water
- 1 February 1998
- journal article
- research article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 71 (2), 413-418
- https://doi.org/10.1246/bcsj.71.413
Abstract
A cationic porphyrin host, [5,10,15,20-tetrakis(1-pentyl-3-pyridinio)porphyrinato]zinc(II), binds benzenecarboxylates, in water. The temperature dependence of the binding affinity showed that the binding was entropically driven: for the binding of 1,2,4,5-benzenetetracarboxylate, ΔH° = 4.36 kJ mol−1 and ΔS° = 95.4 J K−1 mol−1. The atropisomerization rates of the porphyrin were investigated by 1H NMR, and were decelerated by the addition of either anionic guests or simple inorganic salts. Electrostatic interactions and accompanying desolvation mainly controlled these equilibrium and kinetic behaviors.Keywords
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