Structural and Reactivity Consequences of Reducing Steric Bulk of
<i>N</i>
,
<i>N′</i>
‐Diarylformamidinates Coordinated to Lanthanoid Ions
作者:Glen B. Deacon、Peter C. Junk、Lauren K. Macreadie、Daniel Werner
DOI:10.1002/ejic.201402653
日期:2014.10
Hg(C6F5)2, and N,N'-bis(4-methylphenyl)formamidine (p-TolFormH) in THF initially produce a THF solvated species [Ln(p-TolForm)3(thf)2] (Ln = La, Ce, Nd, Sm). Upon addition of non-coordinating solvents, coordinated THF is rapidly liberated, producing unsolvated, dimeric complexes of the general formula [Ln(p-TolForm)3]2 [Ln = La (La1), Ce (Ce2), Nd (Nd3a), Sm (Sm4a)], containing rare μ-1κ(N,N'):2κ(N,N') formamidinate
稀土金属、Hg(C6F5)2 和 N,N'-双(4-甲基苯基)甲脒 (p-TolFormH) 在 THF 中的氧化还原金属转移/质子分解反应最初产生 THF 溶剂化物质 [Ln(p-TolForm) 3(thf)2](Ln = La、Ce、Nd、Sm)。添加非配位溶剂后,配位的 THF 迅速释放,产生通式 [Ln(p-TolForm)3]2 [Ln = La (La1)、Ce (Ce2)、Nd (Nd3a) 的未溶剂化二聚体配合物, Sm (Sm4a)],含有稀有的 μ-1κ(N,N'):2κ(N,N') 甲脒配体,桥接在两个金属中心之间。这种结合在稀土 N,N'-二芳基甲脒化学中是前所未有的,在甲脒或脒配位化学中通常不常见。THF 释放的这种趋势取决于金属尺寸,因为较小的镥类似物 [Lu(p-TolForm)3(thf)] (Lu5) 保持溶剂化,具有七配位单体结构。二聚体 Sm4a