ISSN:
1573-935X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The nepheloxetic effect (reduction in the electron repulsion parameter B in a coordination compound relative to that in the gaseous ion) indicates that the bond type deviates from ionic. There is a linear relation between the long-wave shift δv (difference in wave-numbers for the bands in the compound and aqua-ion) and B for the d-transition metals; δv is dependent on the type of bond from the metal to the addend. These δv have been measured for the 4J9/2→2P1/2 bond (which corresponds to a bond from Nd to a dissociated carboxyl, alcohol, or other OH group) and have been found to be additive; the increments correponding to these groups have been deduced and used to deduce the structure of the internal sphere for Nd and Eu coordinated with hydroxy-acids, EDTA, and other substances in aqueous solution. The splitting of the 4J9/2(Nd3+) and 5D2(Eu3+) levels has given the symmetry of the aqua-ion (C4), of the EDTA one (C4V), of the cyanotriacetate one (C3V), and of the diethylenetriaminepentacetate one (C3V) for Nd and Eu.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00526486
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