Metal Ion Complexation Studies of Novel 8-Hydroxyquinoline-Containing Diaza-18-Crown-6 Ligands and Analogues.

Abstract

Interaction of some 8-hydroxyquinoline-substituted and related ligands (see Figure 1) with various metal ions was evaluated by a calorimetric titration technique at 25 deg C in MeOH. Bis-(8-hydroxyquinoline-2-ylmethyl)-substituted ligand 13 forms a very strong complex with Ba(2+) (log K = 11.6 in MeOH) and is highly selective for Ba(2+) over Na(+), K(+), Zn(2+) and Cu(2+) (selectivity factor > 10(exp 6)). The H1 NMR spectral studies of the Ba(2+) complexes with bis-(8-hydroxyquinoline-2-ylmethyl)- and bis(5,7-dichloro-8-hydroxyquinoline-2-ylmethyl)-substituted diaza-18-crown-6 ligands (13 and 10) suggest that these complexes are cryptate-like structures with two overlapping hydroxyquinoline rings forming a pseudo second.

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Document Details

Document Type
Technical Report
Publication Date
Nov 03, 1999
Accession Number
ADA370489

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  • Jerald S. Bradshaw
  • Krzysztof E. Krakowiak
  • Paul B. Savage
  • Reed M. Izaft
  • Xian X. Zhang

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  • Brigham Young University

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