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Dicerium letterbox-shaped tetraphenolates: f-block complexes designed for two-electron chemistry.
Dalton Transactions ( IF 3.5 ) Pub Date : 2019-12-20 , DOI: 10.1039/c9dt03291f
Polly L Arnold 1 , Kai Wang , Steven J Gray , Liane M Moreau , Corwin H Booth , Massimiliano Curcio , Jordann A L Wells , Alexandra M Z Slawin
Affiliation  

Rare examples of molecular, dinuclear CeIII and PrIII complexes with robust Ln-coordination are accessible by use of the tetraphenolate pTP as a supporting, chelating O-donor ligand platform, pTP = [{2-(OC6H2R2-2,4)2CH}-C6H4-1,4]4- that favours the higher formal oxidation states accessible to rare earths. Two classes of complexes have been made from the platforms; one metallacyclic 2 + 2 [Ln2(pTP)2] framework with a rigid, letterbox-shaped geometry and [Ln(aryloxide)4] core, and one more flexible [(LnX)2(pTP)] with one rare earth ion at either end of the platform. The LnIII letterbox complexes have two K+ counter-cations, one of which sits inside the letterbox, binding the two central arenes of the platform sufficiently strongly that it cannot be displaced by solvent molecules (THF and pyridine) or crown ethers. Oxidation of the CeIII lettterboxes is facile and forms the unusual neutral molecular (CeIV)2 letterbox in which the CeIV reduction potential is -1.83 V vs. Fc/Fc+. The electronic structure of the Ce(iii/iv) complexes was investigated using HERFD-XAS (high energy resolution fluorescence detection X-ray absorption spectroscopy).

中文翻译:

Dicerium字母盒形的四酚盐:专为二电子化学设计的f嵌段配合物。

通过使用四酚盐pTP作为支持性螯合的O-供体配体平台,pTP = [{2-(OC6H2R2-2,4)2CH}- C6H4-1,4] 4-有助于稀土元素获得更高的正式氧化态。平台已经制造出两类复合物。一个金属环2 + 2 [Ln2(pTP)2]框架,具有刚性的信箱形几何结构和[Ln(芳基氧化物)4]核,以及一个更具柔韧性的[(LnX)2(pTP)],其中一个稀土离子为平台的任一端。LnIII信箱复合物具有两个K +抗衡阳离子,其中一个位于信箱内,与平台的两个中心芳烃足够牢固地结合,以至于它不能被溶剂分子(THF和吡啶)或冠醚所取代。CeIII传递盒的氧化很容易,并且形成了不寻常的中性分子(CeIV)2信箱,其中CeIV还原电势相对于Fc / Fc +为-1.83V。Ce(iii / iv)配合物的电子结构使用HERFD-XAS(高能分辨率荧光检测X射线吸收光谱法)进行了研究。
更新日期:2020-01-06
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