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US 4,523,994 AGranted
Bis-crown-ether derivatives and their use
AssigneeShimadzu Corporation
InventorsToshiyuki Shono, Keiichi Kimura, Takumi Maeda
Life of this patent
Estimating the term…
Abstract
Bis-crown-ether derivatives having such configuration that the two crown rings may easily overlap spatially, holding a potassium or the like ion between them, and ion-selective membranes used for said bis-crown-ether derivatives as neutral carrier, which are useful as an ion sensor and are superior to the ion-selective membrane containing valinomycin.
Claims15
An ion-selective membrane comprising at least one bis-crown-ether derivative of the general formual (I):
- ##STR15## wherein A represents a divalent organic group which may take such a configuration that the two crown rings may easily overlap spatially, holding a monovalent metal ion having an ionic radius of 1.3-2.1 .ANG. between them, like a sandwich.
An ion-selective membrane comprising a bis-crown-ether derivative of the formula:
- ##STR22##
Dependencies are inferred from the claim text.