Two Keggin-type heteropolytungstates with transition metal as a central atom: Crystal structure and magnetic study with 2D-IR correlation spectroscopy

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• 作者：Feng Chai^a ; YiPing Chen^a ; ^b ; ^{ypchen007@sina.com} ; ^{ypchen007@hotmail.com} ; ZhuChai You^a ; ZeMin Xia^a ; SuZhi Ge^a ; YanQiong Sun^a ; BiHua Huang^a
• 关键词：Polyoxometalates ; Hydrothermal technique ; Keggin-type ; Magnetic-dependent 2D-IR correlation spectroscopy
• 刊名：Journal of Solid State Chemistry
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：202
• 期：Complete
• 页码：161-167
• 全文大小：1783 K

文摘

Two Keggin-type heteropolytungstates, [Co(phen)₃]₃[CoW₁₂O₄₀]¡¤9H₂O 1 (phen=1,10-phenanthroline) and [Fe(phen)₃]₂[FeW₁₂O₄₀]¡¤H₃O¡¤H₂O 2, have been synthesized via the hydrothermal technique and characterized by single crystal X-ray diffraction analyses, IR, XPS, TG analysis, UV-DRS, XRD, thermal-dependent and magnetic-dependent 2D-COS IR (two-dimensional infrared correlation spectroscopy). Crystal structure analysis reveals that the polyanions in compound 1 are linked into 3D supramolecule through hydrogen bonding interactions between lattice water molecules and terminal oxygen atoms of polyanion units, and [Co(phen)₃]²⁺ cations distributed in the polyanion framework with many hydrogen bonding interactions. The XPS spectra indicate that all the Co atoms in 1 are +2 oxidation state, the Fe atoms in 2 existing with +2 and +3 mixed oxidation states.