Combination of Lacunary Polyoxometalates and High-Nuclear Transition-Metal Clusters under Hydrothermal Conditions. 5. A Novel Tetrameric Cluster of [{FeIIFeIII12(μ3-OH)12(μ4-PO4)4}(B-α-PW9O34)4]22-

• DOI: 10.1021/ic701810t
• Publication Date: 2007-12-01T09:00:39Z
• Authors: Jun-Wei Zhao; Jie Zhang; Shou-Tian Zheng; Guo-Yu Yang
• Keywords: Lacunary function; Tetramer; Polyoxometalate; Thermogravimetric analysis; Ethylene diamine

A novel tetrameric cluster, (enH2)3.5H15[{FeIIFeIII12(μ3-OH)12(μ4-PO4)4}(B-α-PW9O34)4]·83H2O (1; en = ethylenediamine), has been hydrothermally synthesized and characterized by IR, optical diffuse reflectance, thermogravimetric analysis, single-crystal X-ray diffraction. The skeleton of 1 is composed four tri-FeIII-substituted [FeIII3(μ3-OH)3(B-α-PW9O34)]3- Keggin moieties fused together through a FeII2O2 unit μ4-PO4 bridges, resulting in unique tetramer with C2 symmetry. Magnetic measurements indicate that reveals the antiferromagnetic interactions between FeII FeIII centers.