Synthesis, magnetic susceptibility and X-ray crystal structure of (tBuNCHCHNtBu)3Yb
| Autor: | Richard A. Andersen, Christopher I. Dalby, F. Geoffrey N. Cloke, Phillip T. Matsunaga, Alexander A. Trifonov, Herbert Schumann, Jörg Loebel, Holger Hemling, Mikhail N. Bochkarev |
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| Rok vydání: | 1995 |
| Předmět: |
Ytterbium
Chemistry Coordination number Organic Chemistry chemistry.chemical_element Crystal structure Biochemistry Magnetic susceptibility Inorganic Chemistry Metal Crystallography chemistry.chemical_compound Oxidation state visual_art Materials Chemistry visual_art.visual_art_medium Physical and Theoretical Chemistry Tetrahydrofuran Monoclinic crystal system |
| Zdroj: | Journal of Organometallic Chemistry. 486:177-182 |
| ISSN: | 0022-328X |
| Popis: | The reaction of (C 10 H 8 )Yb(THF) 3 with t BuNCHCHN t Bu ( t Budad) in tetrahydrofuran at room temperature leads to Yb( t Budad) 3 ( 1 ), which is also obtained from the reaction of YbCl 3 and three molar equivalents of K( t Budad) in tetrahydrofuran or by metal vapor synthesis. 1 has been characterized by X-ray diffraction. The crystals are monoclinic, space group C 2, Z = 2 with a = 1034.8(9), b = 1710.4(6), c = 1020.4(8) pm, β = 113.28(2)°. The structure was refined to R = 0.0274 for 1466 observed reflections ( F O > 4 σ ( F O )). The structure shows that the empirical composition is Yb( t Budad) 3 and that the coordination number of Yb is six, but the X-ray data are not sufficiently accurate to judge if the oxidation state of ytterbium is zero, two or three. The magnetic susceptibility of solid 1 , prepared by metal vapor synthesis, was studied from 5 to 300 K. The magnetic results are explained by postulating that the bivalent ytterbium species [Yb II ( t Budad)] predominates at low temperature and as the temperature increases the trivalent ytterbium species [Yb III ( t Budad − ) 3 ] predominates in the solid state. |
| Databáze: | OpenAIRE |
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