New mixed halide compounds MFX of divalent rare earths (M = Sm, Eu, Tm, and Yb; X = Cl, Br, and I)
作者:H.P. Beck
DOI:10.1016/0022-4596(78)90067-1
日期:1978.1
The synthesis of new mixed halide compounds MFX (M = Sm, Eu, Tm, Yb; X = Cl, Br, I) of divalent rare earths is reported. Lattice parameters and X-ray diffraction patterns are presented for these compounds, all of which crystallize in the tetragonal PbFCl-type arrangement. The geometric variations within this structure type and its relationships to the FeSi2 structure are discussed.
据报道合成了新的二价稀土混合卤化物化合物M F X(M = Sm,Eu,Tm,Yb; X = Cl,Br,I)。给出了这些化合物的晶格参数和X射线衍射图,所有这些化合物均以四方PbFCl型排列形式结晶。讨论了这种结构类型内的几何变化及其与FeSi 2结构的关系。
Catalytic activity of solvated and unsolvated lanthanide halides in Friedel–Crafts acylations
作者:Denise Barbier-Baudry、Alain Dormond、Stéphanie Richard、Jean Roger Desmurs
DOI:10.1016/s1381-1169(00)00285-5
日期:2000.11
Anhydrouslanthanide halides — chlorides and bromides — can act as homogeneous catalysts of Friedel–Crafts acylations. The catalytic activity is related to the solubility of these anhydrous salts. More soluble THF or dioxane (Diox.) neodymium and samarium adducts are more active catalysts.
Addition compounds between lanthanide bromides and N,N-dimethylacetamide
作者:G. Vicentini、C. Airoldi
DOI:10.1016/0022-1902(71)80610-3
日期:1971.6
hydrated lanthanide bromides and N,N-dimethylacetamide (DMA) was studied. Compounds of general formula LnBr3·5DMA (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, and Dy) and LnBr3·5DMA·3H2O (Ln = Ho, Er, Tm, Yb, Lu, and Y) were obtained. The i.r. spectra, the molar conductance of the compounds in DMA and nitromethane have been determined. A study considering the existence of cationic species in DMA solutions
Abstract Complexes of rareearth bromides with glycine, REBr 3 ·3Gly·3H 2 O (RE is Ce, Pr, Sm, Eu, Gd, Tb, Dy and Y; Gly is glycine) have been synthesized and characterized by means of chemical analysis, elemental analysis, molar conductivity, thermogravimetry, IR spectra and X-ray diffractometry. The IR spectra of the above complexes indicate that in the complexesglycine is coordinated to rare earth
摘要 合成了稀土溴化物与甘氨酸的配合物REBr 3 ·3Gly·3H 2 O(RE为Ce、Pr、Sm、Eu、Gd、Tb、Dy和Y;Gly为甘氨酸)并通过化学分析表征。 、元素分析、摩尔电导率、热重、红外光谱和 X 射线衍射。上述配合物的红外光谱表明,在配合物中甘氨酸通过羧基的氧与稀土阳离子配位。通过TG和DTG技术研究了这些配合物从环境温度到1000°C的热分解过程。通过TG技术在非等温条件下研究了这些配合物的热分解动力学。动力学参数(活化能 E 和指前因子,