مشخصات پژوهش

عنوان	Sandwich-type polyoxoanions based on A-b-GeW9O10 34 . Synthesis and characterization of [(A-b-GeW9O34)2(MOH2)3CO3]13Z (M^Y3Y, Sm3Y, and Yb3Y) polyoxoanions
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Polyoxoanions- Sandwich type- A--GeW9O34- Trivalent yttrium- samarium- and ytterbium ions- 183W-NMR spectroscopy
چکیده	The title complexes were synthesized at room temperature by the reaction of A--GeW9O10 34 with MCl3 (M¼Y3þ, Sm3þ, and Yb3þ) in 0.1 mol L1 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 D¼30.56 affirms the presence of A--GeW9O10 34 . 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 430C.
پژوهشگران	سحر غلامیان (نفر دوم)، روشن خوشنوازی (نفر اول)