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Intramolecular stacking interaction in mixed‐ligand complexes containing ATP4− and aromatic N‐heterocyclic ligands

Intramolecular stacking interaction in mixed‐ligand complexes containing ATP4− and aromatic... The stability constants of the binary ML2+ and ternary M(ATP)L2− complexes, where L=Iq (isoquinoline) or BIm (benzimidazole) and M=Zn2+ or Cd2+, have been determined by potentiometric pH titration in aqueous solution at I=0.1 mol/L (NaClO4), T=25°C. The stability of the ternary complexes characterized by ΔlogKM=logKM(ATP)LM(ATP)L‐ logKMML corresponding to the equilibrium M(ATP)2− + ML2+ = M(ATP)L2− + M2+ in higher than what would be expected on statistical grounds. The increase may be related to the stacking interaction between the aromatic ring of the ligands L and the purine moiety of ATP4–. 1H NMR studies of Zn2+/ATP4−/L confirm the presence of stacking in the ternary complexes. It is concluded that the strength of the intramolecular stacking interaction ia dependent on the structure of the aromatic ring of the ligand L and the formation of a metal ion bridge. Possible implications an discussed briefly. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Chinese Journal of Chemistry Wiley

Intramolecular stacking interaction in mixed‐ligand complexes containing ATP4− and aromatic N‐heterocyclic ligands

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References (11)

Publisher
Wiley
Copyright
Copyright © 1998 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1001-604X
eISSN
1614-7065
DOI
10.1002/cjoc.19980160410
Publisher site
See Article on Publisher Site

Abstract

The stability constants of the binary ML2+ and ternary M(ATP)L2− complexes, where L=Iq (isoquinoline) or BIm (benzimidazole) and M=Zn2+ or Cd2+, have been determined by potentiometric pH titration in aqueous solution at I=0.1 mol/L (NaClO4), T=25°C. The stability of the ternary complexes characterized by ΔlogKM=logKM(ATP)LM(ATP)L‐ logKMML corresponding to the equilibrium M(ATP)2− + ML2+ = M(ATP)L2− + M2+ in higher than what would be expected on statistical grounds. The increase may be related to the stacking interaction between the aromatic ring of the ligands L and the purine moiety of ATP4–. 1H NMR studies of Zn2+/ATP4−/L confirm the presence of stacking in the ternary complexes. It is concluded that the strength of the intramolecular stacking interaction ia dependent on the structure of the aromatic ring of the ligand L and the formation of a metal ion bridge. Possible implications an discussed briefly.

Journal

Chinese Journal of ChemistryWiley

Published: Jul 1, 1998

Keywords: ; ; ; ;

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