A Pyridazine-Bridged Sandwiched Cluster Incorporating Planar Hexanuclear Cobalt Ring and Bivacant Phosphotungstate

作者：Guo, Ling-Yu; Zeng, Su-Yuan; Jaglicic, Zvonko; Hu, Qi-Dong; Wang, Shi-Xuan; Wang, Zhi; Sun, Di^*

来源：Inorganic Chemistry, 2016, 55(17): 9006-9011.

DOI：10.1021/acs.inorgchem.6b01468

• SINGLE-MOLECULE MAGNETS
• COORDINATION POLYMERS
• POLYOXOMETALATE
• LIGANDS
• KEGGIN
• HETEROPOLYTUNGSTATES
• CHEMISTRY
• CU
• HETEROPOLYOXOTUNGSTATES
• TUNGSTOPHOSPHATE

A planar hexanuclear cobalt ring was clamped by two bivacant alpha(1)-[PW10O37](9-) with the assistance of the pyridazine bridges to form a novel sandwiched Co(II)-polyoxometalate cluster compound, [Na(H2O)(6)]-[Co-3(OH) (pydz)(4)(H2O)(7)][Co-6(PW10O37)(2)(pydz)(4)(H2O)(6)]center dot 43H(2)O (1; pydz = pyridazine).This cluster was identified by X-ray single-crystal diffraction, elemental analysis, Fourier transform IR and UV-visible spectroscopies, and cyclic voltammetry (CV). Structural analysis reveals that 1 comprises a hexahydrated sodium, a trinuclear [Co-3(OH) (pydz)(4)(H2O)(7)](5+) cationic cluster, and an anionic [Co-6(PW10O37)(2)(pydz)(4)(H2O)(6)](6-) sandwiched cluster, thus giving an intrinsical intercluster compound. The isolation of such cluster was dependent on the in situ transformation of trivacant [alpha-P2W15O56](12-) to alpha(1)-[PW10O37](9-) under the hydrothermal condition. The CV shows reversible multielectron waves from the redox of W-VI in 1. Cluster 1 exhibits remarkable electrocatalytic activity toward the reduction of nitrite. Magnetism studies indicated a weak anti-ferromagnetic exchange interaction between Co(II) ions within 1.

• 出版日期2016-9-5
• 单位山东大学; 聊城大学