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Mario Glanz Sebastian Dechert Herbert Schumann Dietmar Wolff Dietmar Wolff Jürgen Springer 《无机化学与普通化学杂志》2000,626(12):2467-2477
The Influence of the Coordination Sphere of Samarocenes on the Synthesis of Liquid Crystalline Polymethacrylates (C5Me5)2Sm(THF)2 ( 1 ) reacts with 1,3‐Diisopropyl‐4,5‐dimethylimidazoline‐2‐ylidene C3N2Me2iPr2 (iPr‐carben) with formation of (C5Me5)2Sm(iPr‐carben) ( 3 ). The reaction of (C5Me4Et)2Sm(THF)2 ( 2 ) with Al2Me6 in toluene yields [(C5Me4Et)2Sm(CH3)Al(CH3)3]2 ( 6 ). 3 and 6 were characterized by single crystal X‐ray structure analysis. Via living polymerization of mesogenic methacrylates with the organosamarium complexes 1 , 2 , 3 , (C5Me5)2Sm(C3H5) ( 4 ), (C5Me5)2Sm(CH3)(THF) ( 5 ), 6 , and (C5Me4Et)2SmCH(SiMe3)2 ( 7 ), liquid crystalline homo‐ and blockcopolymers were obtained with narrow molecular mass distribution indexes in high yield. Partial competitive mechanisms are observed dependend of the structure of the catalyst and the polarity of the solvents. 相似文献
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New Ternary Selenides of Lanthanoides by Reduction of Sesquiselenides The compounds MLn2Se3 (M = Na; Ln = La? Sm) and MLn8Se12 (M = Na, Ca; Ln = La? Sm) were prepared by reduction of the corresponding lanthanide sesquiselenides with sodium and calcium, respectively, for the first time. Further-more MLa8Se12 (M = Sr, Eu) could be obtained in an analogous way. All compounds were characterized by chemical analysis and X-ray powder diffraction. The electronic structures of these compounds were investigated by band structure calculations and magnetic measurements. 相似文献
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