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Preparation of some lanthanide violurate complexes

✍ Scribed by Dr. I. S. Ahmed Farag; R. M. Awadallah; A. A. M. Gad

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
623 KB
Volume
24
Category
Article
ISSN
0232-1300

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✦ Synopsis

Preparation of Some Lanthanide Violurate Complexes

Violurate complexes of Ce3+, Pr3+, Pr4+, Nd3+, Sm3+, Eu3+, Gd3+, Dy3+, Ho3+, Er3+, and Yb3+ were prepared. The prepared complexes are freely soluble in hot water and dilute mineral acids. Thermal analysis (DTA, DTG, and TGA) show that the solid complexes are characterized by endo-and exothermic bands, indicating that they are degradated a t different temperature stages. TheIR spectra of the ligand and its metal complexes reveal that bonding takes place through coordination bonds between the central metal ion and the oxygen atom of the oximino (C = N -0 ) group and the oxygen of the phenolic (ketonic group ( C r O -H). All the isomorphous complexes, detected by the X-ray diffraction patterns, have similar IR spectra.

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## Abstract The existence of two independent chromophores in [Ru(bipy)~2~(H~2~V)]^+^, where H~2~V^βˆ’^ = violurate anion and bipy = 2,2β€²bipyridine, was demonstrated by comparing its resonance Raman spectra with those displayed by the [Ru(H~2~V)~3~]^βˆ’^ analogue. In the former, the electronic band at 4