1364282-40-5Relevant academic research and scientific papers
Divalent lanthanide complexes supported by the bridged bis(amidinates) L [L = Me3SiN(Ph)CN(CH2)3NC(Ph)NSiMe3]: Synthesis, molecular structures and one-electron-transfer reactions
Yan, Lijuan,Liu, Haidong,Wang, Junfeng,Zhang, Yong,Shen, Qi
, p. 4151 - 4160 (2012)
Metathesis reactions of YbI2 with Li2L (L = Me 3SiN(Ph)CN(CH2)3NC(Ph)NSiMe3) in THF at a molar ratio of 1:1 and 1:2 both afforded the Yb(II) iodide complex [{YbI(DME)2}2(μ2-L)] (1), which was structurally characterized to be a dinuclear Yb(II) complex with a bridged L ligand. Treatment of EuI2 with Li2L did not afford the analogous [{EuI(DME)2}2(μ2-L)], or another isolable Eu(II) complex, but the hexanuclear heterobimetallic cluster [{Li(DME)3}+]2[{(EuI) 2(μ2-I)2(μ3-L) 2(Li)4}(μ6-O)]2- (2) was isolated as a byproduct in a trace yield. The rational synthesis of cluster 2 could be realized by the reaction of EuI2 with Li2L and H 2O in a molar ratio of 1:1.5:0.5. The reduction reaction of LLnCl(THF)2 (Ln = Yb and Eu) with Na/K alloy in THF gave the corresponding Ln(II) complexes [Yb3(μ2-L)3] (3) and [Eu(μ2-L)(THF)]2 (4) in good yields. An X-ray crystal structure analysis revealed that each L in complex 3 might adopt a chelating ligand bonding to one Yb atom and each Yb atom coordinates to an additional amidinate group of the other L and acts as a bridging link to assemble a macrocyclic structure. Complex 4 is a dimer in which the two monomers [Eu(μ2-L)(THF)] are connected by two μ2-amidinate groups from the two L ligands. Complex 3 reacted with CyN=C=NCy and diazabutadienes [2,6-iPr2C6H 3N=CRCR=NC6H3iPr2-2,6] (R=H, CH3) (DAD) as a one-electron reducing agent to afford the corresponding Yb(III) derivatives: the complex with an oxalamidinate ligand [LYb{(NCy)2CC(NCy)2}YbL] (5) and the complexes containing a diazabutadiene radical anion [LYb(iPr2C 6H3NCRCRNC6H3iPr 2)] (R = H (6), R = CH3 (7)). Complexes 5-7 were confirmed by an X-ray structure determination.
