Hydrothermal Synthesis And Crystal Structure Of Phosphorus-containing Transition Metal Clusters Research

In recent years, the construction of multi-functional inorganic materials is currently of great interest due to its intriguing electromagnetism, photochemistry, electric conductivity and catalytical, etc. Therefore, effective strategies to build tailored inorganic materials reliably and predictably are required in order to meet the ever-increasing demands placed on material synthesis and performance. In this dissertation, two novel compounds {[PMo12O40(VO)]H3O}·13H2O(1) and [{Co(4-pya)}3PO4](2) have been hydrothermally synthesized and characterized by IR, XPS, and single-crystal X-ray diffraction. The structure of 1 consists of polyoxometalate [PMoVI12O40(VIVO)]-, a proton hydrate H3O+ and thirteen lattice water molecular. The structure of [PMoVI12O40(VIVO)]- is based on the well-known α-Keggin core {PMo12O40} capped by a {VO} unit on the two opposite pits with S.O.F. 50﹪ respectively. The central atom P is enclosed by eight oxygen atoms with same S.O.F.(50﹪) to form a cube. A novel paddlewheel type compound 2 containing trinuclear cobalt cluster has been obtained. Co3 clusters are connected by PO4 tetrahedra and 4-pya ligands to form a 3D network structure. In most of cobalt coordination polymers, Co ions are six-coordinated in an octahedral symmetry, whereas five-coordinated ones are seldom. In the compound 2, the Co ions are five-coordinated in trigonal bipyramidal geometry. The magnetic investigations of 2 reveal that strong antiferromagnetic interactions exist in the Co3 clusters.