Versatility of cyclooctatetraenyl ligands in rare earth metal complexes of the [M2(COT)3(THF)2] (M = Y and La) type†
Abstract
Two new organometallic cyclooctatetraenyl complexes of the type [M2(COT)3(THF)2] (M = Y and La) have been prepared, using optimized synthetic procedures, and fully characterized by X-ray diffraction analysis, IR and 1H NMR spectroscopies. The structures can be represented as formed by the double-decker [M(COT)2]− anion with an asymmetrically bound cationic [M(COT)(THF)2]+ unit. The COT rings in the anionic sandwich are not equidistant from the metal with the M–COTcentroid distances measuring at 1.991(5) Å and 2.074(5) Å for [Y(COT)2]−vs. 2.045(4) Å and 2.154(5) Å for [La(COT)2]−. The sandwich fragments are η2-coordinated to the second metal center with the average M–C distances of 2.837(4) Å and 2.879(5) Å for yttrium and lanthanum complexes, respectively. The M–COTcentroid distances in the cationic unit are 1.962(4) Å for the former and 2.009(2) Å for the latter.
![Graphical abstract: Versatility of cyclooctatetraenyl ligands in rare earth metal complexes of the [M2(COT)3(THF)2] (M = Y and La) type](/az/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C9DT00868C&imageInfo.ImageIdentifier.Year=2019)
- This article is part of the themed collection: Challenges in organometallic & coordination chemistry: in celebration of Geoff Cloke’s 65th birthday
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