在水热条件下,成功合成了一例新的异金属修饰的有机-无机杂化型多金属同多酸簇合物[Cu(en)_2(H_2O)]_4[Ce(W_5O_(18))_2]·4H_2O(1)(en=乙二胺),采用X射线单晶衍射、元素分析、X射线粉末衍射及热重分析对化合物进行了结构分析和基本表征.化合物1属于单斜晶系,P2_1/c空间群,单胞参数为a=2.736 1(2)nm,b=1.452 52(7)nm,c=1.634 53(9)nm,β=97.153(6)°.结构解析表明,化合物1中的中心离子Ce~(4+)与两个同多酸簇块的O原子结合形成八配位的四方反棱柱体,并通过游离的及支撑的[Cu(en)_2(H_2O)]~(2+)进行修饰.值得注意的是,化合物1是首例基于{W_5O_(18)}型同多酸簇块的Cu-Ce异金属修饰型有机-无机杂化的孤立结构.
A new organic-inorganic hybrid [W_5O_(18)]-based TM-Ln heterometallic isopolyoxotungstate[Cu(en)_2(H_2O)]_4[Ce(W_5O_(18))_2]·4H_2O(1)(Ln=lanthanide,TM=transition metal,en=1,2-ethylenediamine) has been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction,elemental analysis,powder X-ray diffraction as well as thermogravimetric analysis.Compound 1 belongs to Monoclinic and P2_1/c space group,and the cell parameters are a=2.736 1(2) nm,b=1.452 52(7) nm,c=1.634 53(9) nm,β=97.153(6) °.The Structural analysis shows that CeⅣcation coordinated with O atoms from two [W_5O_(18)]_6-units,forming distorted square antiprism geometry,and was defined by copper-en cations.Notably,compound 1 represents the first discrete W_5O_(18)-containing TM-Ln heterometallic isopolyoxotungstate.