与顺磁性镧系元素(Sc,Y,La和Lu)相比,顺磁性镧系元素(Ln,从Ce到Yb)的有机金属化学远没有那么发达。缺乏可用的起始原料和表征方法是主要障碍。本文中我们报道了钕,g 、,和的三苄基配合物的合成和表征。此外,我们介绍了一种直接程序,用于从相应的氧化物开始合成由二茂铁二酰胺配体支撑的镧系元素苄基和碘化物配合物。所有新合成的化合物均通过X射线晶体学,1 H NMR光谱((化合物为NMR静音)和元素分析进行了表征。
与顺磁性镧系元素(Sc,Y,La和Lu)相比,顺磁性镧系元素(Ln,从Ce到Yb)的有机金属化学远没有那么发达。缺乏可用的起始原料和表征方法是主要障碍。本文中我们报道了钕,g 、,和的三苄基配合物的合成和表征。此外,我们介绍了一种直接程序,用于从相应的氧化物开始合成由二茂铁二酰胺配体支撑的镧系元素苄基和碘化物配合物。所有新合成的化合物均通过X射线晶体学,1 H NMR光谱((化合物为NMR静音)和元素分析进行了表征。
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O-Catalyzed Route to Early Lanthanide Tribromide THF and DME Solvates from Oxides
作者:Alex R. Petrov、Noa K. Pruß、Andrei V. Churakov、Konstantin A. Rufanov、Jörg Sundermeyer
DOI:10.1002/zaac.201800509
日期:2019.5.15
solvates of lanthanum and other early lanthanide tribromides was developed using the water‐catalyzed reaction of lanthanide(III) oxides with highly reactive Me3SiBr in situ formed from commercially available disilane Si2Me6 and Br2. This practical route allows to obtain the target lanthanum tribromide solvates [LaBr3(thf)4] (1a) and [LaBr3(dme)2]2 (1b) as well as analogous early lanthanide molecular tribromide
An Ionic Liquid-Mediated Route to Cerium(III) Bromide Solvates
作者:Kalyan V. Vasudevan、Nickolaus A. Smith、Brian L. Scott、Edward A. McKigney、Michael W. Blair、John C. Gordon、Ross E. Muenchausen
DOI:10.1021/ic200353s
日期:2011.5.16
series of cerium bromide solvates is reported. The combination of bulk cerium bromide and the ionic liquid (IL) 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide results in a precursor paste that enhances the solubility of the cerium(III)bromide moiety in a number of donor solvents. Crystallization from these solvents has resulted in the isolation and characterization of CeBr3(THF)4 (2), CeBr3(2-Me-THF)4
Rare Earth Metal Alkyl Complexes with Methyl-Substituted Triazacyclononane-amide Ligands: Ligand Variation and Ethylene Polymerization Catalysis
作者:Sergio Bambirra、Daan van Leusen、Cornelis G. J. Tazelaar、Auke Meetsma、Bart Hessen
DOI:10.1021/om060870a
日期:2007.2.1
Comparative testing in catalytic ethylene polymerization showed that the catalyst activity is most strongly influenced by the metal ionic radius, but that variations in the ligand backbone and substitution pattern do influence other factors, such as polymer molecular weight and catalyst stability. Catalysts with the intermediately sized rare earth metal yttrium generally showed the highest activity, but
制备了一系列具有通式[Me 2 TACN-(B)-NR] M(CH 2 SiMe 3)2(TACN = 1,4,7-三氮杂环壬烷,B =(CH 2)的稀土金属二烷基配合物2,SiMe 2 ; R = t Bu,sec Bu,n卜; M = Sc,Y,Nd,La)。对于M = Sc,也可以使用混合的单烷基一氯配合物。这些配合物的选定实例在结构上得到了表征,并显示出畸变的八面体环境中的金属。使用路易斯或布朗斯台德酸活化剂,可以将二烷基化合物转化为相应的单烷基阳离子,并通过NMR光谱对其进行表征。催化乙烯聚合的比较测试表明,催化剂活性受金属离子半径的影响最大,但是配体主链和取代方式的变化确实会影响其他因素,例如聚合物分子量和催化剂稳定性。具有中等大小的稀土金属钇的催化剂通常显示出最高的活性,但是其中一些催化剂会产生分子量分布较宽的聚乙烯,表明存在多点行为。从理论上讲,这可能是由于分子间配体加扰过
One Ligand Fits All: Cationic Mono(amidinate) Alkyl Catalysts over the Full Size Range of the Group 3 and Lanthanide Metals
作者:Sergio Bambirra、Marco W. Bouwkamp、Auke Meetsma、Bart Hessen
DOI:10.1021/ja0475297
日期:2004.8.1
Using a sterically demanding amidinate ancillary ligand and an in situ alkylation procedure, neutral mono(amidinate) dialkyl and cationic mono(amidinate) monoalkyl complexes were prepared for metals spanning the full size range of the group 3 and lanthanide metals. The activity of the cationic monoalkyls in catalytic ethenepolymerization was found to vary by over 2 orders of magnitude depending on
Lanthanum Dibromide Complexes of Sterically Demanding Aminopyridinato and Amidinate Ligands
作者:Winfried P. Kretschmer、Auke Meetsma、Bart Hessen、Natalie M. Scott、Sadaf Qayyum、Rhett Kempe
DOI:10.1002/zaac.200600142
日期:2006.9
mine 1, Am*-H = N,N'-bis-(2,6-diisopropylphenyl)benzamidine). X-ray crystal structure analyses of the two seven coordinated complexes were carried out to compare the steric demand of the two amido ligands. A similar overall primary coordination site bulkiness for both ligands and distinct differences regarding this bulkiness for different directions were observed. A better shielding of the second coordination