Journal
JOURNAL OF COORDINATION CHEMISTRY
Volume 63, Issue 19, Pages 3365-3372Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2010.511666
Keywords
Polyoxoanions; Sandwich type; A--GeW9O34; Trivalent yttrium; samarium; and ytterbium ions; 183W-NMR spectroscopy
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The title complexes were synthesized at room temperature by the reaction of A--GeW9[image omitted] with MCl3 (M = Y3+, Sm3+, and Yb3+) in 0.1 mol L-1 sodium carbonate solution and characterized by elemental analysis, FT-IR, UV, 13C- and 183W-NMR spectroscopies, and thermogravimetric analysis (TGA). Two-line 183W-NMR spectrum with 2 : 1 intensity ratio confirms that [(A--GeW9O34)2(MOH2)3CO3]13- contains an anion of D3h symmetry. The difference of the two chemical shifts = 30.56 affirms the presence of A--GeW9[image omitted]. The chemical shift of the single-line 13C-NMR spectrum of [(A--GeW9O34)2(MOH2)3CO3]13- and frequencies of stretching vibrations of all three complexes affirm the presence of coordinated carbonate. TGA shows that the complexes are thermally stable up to 430 degrees C.
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