Yang Yongfeng, Li Tao, Chen Yanmei
College of Chemical Engineering, Huanggang Normal University, and Hubei Key Laboratory for Processing and Application of Catalytic Materials, Huanggang 438000, People's Republic of China.
Acta Crystallogr C Struct Chem. 2015 Oct;71(Pt 10):903-7. doi: 10.1107/S2053229615016617. Epub 2015 Sep 18.
The title compound, poly[[diaqua-1κ(2)O-tetrakis(μ3-pyridine-2,3-dicarboxylato)-2:1:2'κ(10)N,O(2):O(2'),O(3):O(3');2:1:2'κ(8)O(3):O(3'):N,O(2)-diiron(III)strontium(II)] dihydrate], {[Fe2Sr(C7H3O4)4(H2O)2]·2H2O}n, which has triclinic (P-1) symmetry, was prepared by the reaction of pyridine-2,3-dicarboxylic acid, SrCl2·6H2O and Fe(OAc)2(OH) (OAc is acetate) in the presence of imidazole in water at 363 K. In the crystal structure, the pyridine-2,3-dicarboxylate (pydc(2-)) ligand exhibits μ3-η(1),η(1):η(1):η(1) and μ3-η(1),η(1):η(1),η(1):η(1) coordination modes, bridging two Fe(III) cations and one Sr(II) cation. The Sr(II) cation, which is located on an inversion centre, is eight-coordinated by six O atoms of four pydc(2-) ligands and two water molecules. The coordination geometry of the Sr(II) cation can be best described as distorted dodecahedral. The Fe(III) cation is six-coordinated by O and N atoms of four pydc(2-) ligands in a slightly distorted octahedral geometry. Each Fe(III) cation bridges two neighbouring Fe(III) cations to form a one-dimensional [Fe2(pydc)4]n chain. The chains are connected by Sr(II) cations to form a three-dimensional framework. The topology type of this framework is tfj. The structure displays O-H...O and C-H...O hydrogen bonding.
标题化合物，聚[[二水合-1κ(2)O-四(μ3-吡啶-2,3-二羧酸根)-2:1:2'κ(10)N,O(2):O(2'),O(3):O(3');2:1:2'κ(8)O(3):O(3'):N,O(2)-二铁(III)锶(II)]二水合物]，{[Fe₂Sr(C₇H₃O₄)₄(H₂O)₂]·2H₂O}ₙ，具有三斜晶系(P-1)对称性，通过在363 K下于水中在咪唑存在的情况下，使吡啶-2,3-二羧酸、SrCl₂·6H₂O和Fe(OAc)₂(OH)（OAc为乙酸根）反应制备得到。在晶体结构中，吡啶-2,3-二羧酸根(pydc(2-))配体呈现μ3-η(1),η(1):η(1):η(1)和μ3-η(1),η(1):η(1),η(1):η(1)配位模式，桥连两个Fe(III)阳离子和一个Sr(II)阳离子。位于对称中心的Sr(II)阳离子由四个pydc(2-)配体的六个O原子和两个水分子八配位。Sr(II)阳离子的配位几何构型可最好地描述为扭曲的十二面体。Fe(III)阳离子由四个pydc(2-)配体的O和N原子以略微扭曲的八面体几何构型六配位。每个Fe(III)阳离子桥连两个相邻的Fe(III)阳离子形成一维[Fe₂(pydc)₄]ₙ链。这些链通过Sr(II)阳离子连接形成三维骨架。该骨架的拓扑类型为tfj。该结构显示出O-H...O和C-H...O氢键。
