A Distorted Cubic Tetranuclear Copper(II) Phosphonate Cage with a Double-Four-Ring-Type Core
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- 作者：Vadapalli Chandrasekhar ; Loganathan Nagarajan ; Rodolphe Clé ; rac ; Surajit Ghosh ; Sandeep Verma
- 刊名：Inorganic Chemistry
- 出版年：2008
- 出版时间：February 4, 2008
- 年：2008
- 卷：47
- 期：3
- 页码：1067 - 1073
- 全文大小：314K
- 年卷期：v.47,no.3(February 4, 2008)
- ISSN：1520-510X
文摘
The reaction of Cu2(O2CMe)4·2H2O with tert-butylphosphonic acid and 3,5-di-tert-butylpyrazole in the presence oftriethylamine leads to a high-yield synthesis of the tetranuclear compound [Cu2(3,5-t-Bu2PzH)2(t-BuPO3)2]2 (1). Thelatter has a distorted cubic cage structure and its core resembles the D4R (double-four-ring) motif found in zeolites.The phosphonate, [t-BuPO3]2-, functions as a dianionic tridentate ligand, while the pyrazole ligands are neutraland are monodentate. The coordination geometry at each copper atom is distorted square planar with a 3O,1Ncoordination environment. Magnetic measurements on 1 reveal that the 
T product continuously decreases toreach a value very close to zero at 1.8 K, indicating dominant antiferromagnetic interactions between Cu(II) ionsthat leads to an S = 0 ground state. The tetranuclear cage 1 functions as a very effective artificial nuclease in thepresence of an external oxidant, magnesium monoperoxyphthalate.
T product continuously decreases toreach a value very close to zero at 1.8 K, indicating dominant antiferromagnetic interactions between Cu(II) ionsthat leads to an S = 0 ground state. The tetranuclear cage 1 functions as a very effective artificial nuclease in thepresence of an external oxidant, magnesium monoperoxyphthalate.