Oxalato-Bridged Neutral Octanuclear Heterometallic Complexes [Ln4K4(L)4(渭-H2O)4(NO3)2(渭-Ox)] (Ln = Dy(III), Gd(III), Tb(III

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• 作者：Prasenjit Bag ; Amit Chakraborty ; Mathieu Rouzi猫res ; Rodolphe Cl茅rac ; Raymond J. Butcher ; Vadapalli Chandrasekhar
• 刊名：Crystal Growth & Design
• 出版年：2014
• 出版时间：September 3, 2014
• 年：2014
• 卷：14
• 期：9
• 页码：4583-4592
• 全文大小：669K
• ISSN：1528-7505

文摘

Stepwise reaction of LH₃ (LH₃ = N[CH₂CH₂N鈺怌H-C₆H₃-2-OH-3-OMe]₃) with Ln(NO₃)₃路nH₂O and potassium oxalate [K₂Ox] afforded discrete heterometallic neutral octanuclear complexes [Ln₄K₄(L)₄(渭-H₂O)₄(NO₃)₂(渭-Ox)] (Ln = Dy(III), Gd(III), Tb(III), Ho(III); LH₃ = N[CH₂CH₂N鈺怌H-C₆H₃-2-OH-3-OMe]₃; Ox = (C₂O₄)^{2鈥?/sup>). The molecular structures of 1鈥?b>4 were confirmed by single-crystal X-ray crystallography. The asymmetric unit of these compounds contains two lanthanide(III) ions and two potassium cations present in the opposite corners of a distorted rectangle. Such a motif is further bridged by an oxalate anion to generate the octanuclear heterometallic complex. The lanthanides are eight-coordinate in a distorted trigonal dodecahedron geometry. On the other hand, the potassium ions adopt a nine-coordinate coordination sphere in a distorted tricapped trigonal prism geometry. Magnetic studies on 1鈥?b>4 reveal the absence of significant magnetic interactions between the magnetic centers present in these complexes.}