ISSN:
1572-8927
Schlagwort(e):
Polyamines
;
sodium-23 NMR
;
nonaqueous solvents
;
preferential solvation
;
chelate effect
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract Intrinsic formation constants for complexes of Na+ ions with a series of polyamines have been determined from23Na NMR measurements in binary mixtures of tetrahydrofuran (THF) and amines. The results show in a totally unambiguous manner a regular decrease in the magnitude of the chelate effect with the number of atoms intervening between the nitrogen ligators. The key assumption, tetracoordination of the cation, is critically examined, and experimental evidence is adduced in its support.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00650710
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