ISSN:
1434-193X
Keywords:
Crown compounds
;
Environmental chemistry
;
Cations
;
Macrocycles
;
Transition metals
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
---First examples of new, modular, redox switchable ionophores for heavy and transition metal cations are presented. These systems are based on a crown ether or polyethylene glycol unit substituted by the 1,2,4-thiadiazole/iminoylthiourea redox system (2a-4a, 2b-4b). The syntheses via a Boulton-Katritzki rearrangement are described and their cation selectivities, studied by extraction experiments, proved to be determined by the systems' redox state. Additionally, simple 5-anilino-3-phenyl-1,2,4-thiadiazole (5a) and the corre-sponding iminoylthiourea (5b), which do not contain a potential cation binding polyether substituent were also tested to investigate the complexation property of the redox active building block itself.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
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