Syntheses, Structures, and Magnetic Properties of a Family of Heterometallic Heptanuclear [Cu5Ln2] (Ln = Y(III), Lu(III), Dy(III), Ho(III), Er(III), and Yb(III)) Complexes: Obser

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• 作者：Vadapalli Chandrasekhar ; Atanu Dey ; Sourav Das ; Mathieu Rouzi猫res ; Rodolphe Cl茅rac
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：March 4, 2013
• 年：2013
• 卷：52
• 期：5
• 页码：2588-2598
• 全文大小：594K
• 年卷期：v.52,no.5(March 4, 2013)
• ISSN：1520-510X

文摘

Sequential reaction of the multisite coordination ligand (LH₃) with Cu(OAc)₂路H₂O, followed by the addition of a rare-earth(III) nitrate salt in the presence of triethylamine, afforded a series of heterometallic heptanuclear complexes containing a [Cu₅Ln₂] core {Ln = Y(1), Lu(2), Dy(3), Ho(4), Er(5), and Yb(6)}. Single-crystal X-ray crystallography reveals that all the complexes are dicationic species that crystallize with two nitrate anions to compensate the charge. The heptanuclear aggregates in 1鈥?b>6 are centrosymmetrical complexes, with a hexagonal-like arrangement of six peripheral metal ions (two rare-earth and four copper) around a central Cu(II) situated on a crystallographic inversion center. An all-oxygen environment is found to be present around the rare-earth metal ions, which adopt a distorted square-antiprismatic geometry. Three different Cu(II) sites are present in the heptanuclear complexes: two possess a distorted octahedral coordination sphere while the remaining one displays a distorted square-pyramidal geometry. Detailed static and dynamic magnetic properties of all the complexes have been studied and revealed the single-molecule magnet behavior of the Dy(III) and Ho(III) derivatives.