Distorted cubic tetranuclear vanadium(IV) phosphonate cages: double-four-ring (D4R) containing transition metal ion phosphonate cages

被引:30
作者
Chandrasekhar, Vadapalli [1 ]
Dey, Atanu [1 ]
Senapati, Tapas [1 ]
Carolina Sanudo, E. [2 ,3 ]
机构
[1] Indian Inst Technol Kanpur, Dept Chem, Kanpur 208016, Uttar Pradesh, India
[2] Univ Barcelona, Dept Quim Inorgan, E-08028 Barcelona, Spain
[3] Univ Barcelona, Inst Nanociencia & Nanotecnol, E-08028 Barcelona, Spain
关键词
STATE COORDINATION CHEMISTRY; HEXANUCLEAR COPPER(II) PHOSPHONATES; ORGANODIPHOSPHONATE SYSTEM; PYRAZOLE LIGANDS; 2,4,6-TRIISOPROPYLPHENYLPHOSPONIC ACID; STRUCTURAL-CHARACTERIZATION; ASYMMETRIC HYDROGENATION; HYDROTHERMAL SYNTHESIS; FLUORIDE INCORPORATION; ADSORPTION PROPERTIES;
D O I
10.1039/c1dt11347j
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The reaction of VCl3 with 3,5-dimethylpyrazole (3,5-Me(2)PzH) and trichloromethylphosphonic/tert-butylphosphonic acid in the presence of triethylamine as a hydrogen chloride scavenger afforded the tetranuclear V(IV) assemblies, [(VO)(4)(3,5-Me(2)PzH)(8)(CCl3PO3)(4)] (1) and [(VO)(4)(3,5-Me(2)PzH)(4)(t-BuPO3)(4)] (2). Both of these compounds possess a distorted cubic framework structures containing V(IV) ions and phosphorus atoms in the alternate corners of the cube. The edges of the cube contain oxygen atoms derived from the phosphonate ligand. The phosphonate ligand in both of these compounds is dianionic and helps to bind to three V(IV) centers. The faces of the cubic ensembles contain puckered V2P2O4 eight-membered rings. The V(IV) center in 1 is six-coordinate in a distorted octahedral geometry while in 2 it is five-coordinate in a distorted square-pyramidal geometry. Magnetic studies carried out on 1 and 2 reveal that the V(IV) centers are anti-ferromagnetically coupled to each other, albeit weakly, through the mediation of the phosphonate ligands.
引用
收藏
页码:799 / 803
页数:5
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