Department of Chemistry, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
Dalton Trans. 2012 Jan 28;41(4):1352-62. doi: 10.1039/c1dt11301a. Epub 2011 Nov 30.
The crystal structures of a broad series of anhydrous Ln(hfac)(3)(monoglyme) complexes, prepared in moderate to high yield, are presented: hfac = 1,1,1,5,5,5-hexafluoroacetylacetonato-; Ln = La, Ce, Pr, Sm, Eu, Gd, Tb, Dy, Er, Tm. This study contradicts the general assumption that monoglyme is too small a polyether to act as a partitioning agent displacing coordinated water on the larger lanthanide(III) ions. The structures of an intermediate La(hfac)(3)(monoglyme)(2) species and the hydrated Ce(hfac)(3)(monoglyme)(H(2)O) species are also included. The crystallographic evidence presented herein is supplemented by other characterization techniques (melting point, IR, etc.) and trends are delineated.
本文呈现了一系列无水 Ln(hfac)(3)(单缩乙二醇)配合物的晶体结构，这些配合物是在中等至高产率下制备的：hfac = 1,1,1,5,5,5-六氟乙酰丙酮酸根；Ln = La、Ce、Pr、Sm、Eu、Gd、Tb、Dy、Er、Tm。这项研究与普遍假设相矛盾，即单缩乙二醇太小，不能作为分配剂，取代较大的镧系(III)离子上的配位水。本文还包括一种中间的 La(hfac)(3)(单缩乙二醇)(2)物种和水合的 Ce(hfac)(3)(单缩乙二醇)(H(2)O)物种的结构。本文提供的晶体学证据通过其他表征技术（熔点、IR 等）得到了补充，并阐述了相关趋势。
