Three new organically templated 1D, 2D, and 3D vanadates: synthesis, crystal structures, and characterizations.
Three new organically templated 1D, 2D, and 3D vanadates: synthesis, crystal structures, and characterizations.
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DOI：
10.1021/ic701725h
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发表时间：
2008-01
影响因子：
4.6
通讯作者：
Yan Xu;Guang-peng Zhou;Dunru Zhu
中科院分区：
文献类型：
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作者：
Yan Xu;Guang-peng Zhou;Dunru Zhu
用溶剂热法合成了三种新的钒酸盐化合物（C（2）N（2）H（10））VO（OH）（4）（I），（NH（4））（3）（C（3）N（2）H（5））V（4）O（10）（II）和V（OH）（3）·0.97H（2）O（III），并通过红外光谱、元素分析和热重分析进行了表征。用单晶X射线衍射法测定了上述三种钒酸盐的晶体结构。化合物I结晶为四面体，空间群P4/mmm，其中a = 9.0465（11）A，c = 3.9897（10）A，V = 326.51（10）A（3），和Z = 2。化合物II结晶为斜方晶系，空间群为Imm，其中a = 3.6012（10）A，B = 11.312（4）A，c = 15.050（4）A，V = 613.1（3）A 3，并且Z = 2。化合物III结晶为立方晶系，空间群Fd 3 m，a = 10.4252（17）A，V = 1133.1（3）A（3），Z = 16。结构分析表明，该化合物为一维直线链状结构，由I中的VO（6）八面体组成。化合物II具有由VO（5）四方锥形成的二维V-O层状结构;质子化咪唑和剩余的NH（4+）阳离子插入层之间。III的烧绿石型三维开放骨架由V（12）和V（4）二级结构单元组成，以VO（6）八面体为结构单元。
Three new vanadate compounds of the formulas (C(2)N(2)H(10))VO(OH)(4) (I), (NH(4))(3)(C(3)N(2)H(5))V(4)O(10) (II), and V(OH)(3).0.97H(2)O (III) have been synthesized by a solvothermal method and characterized by IR spectroscopy, elemental analysis, and thermogravimetric analysis. The crystal structures of the above three vanadates have been established by single-crystal X-ray diffraction. Compound I crystallizes as tetragonal, space group P4/mmm, with a = 9.0465(11) A, c = 3.9897(10) A, V = 326.51(10) A(3), and Z = 2. Compound II crystallizes as orthorhombic, space group Immm, with a = 3.6012(10) A, b = 11.312(4) A, c = 15.050(4) A, V = 613.1(3) A3, and Z = 2. Compound III crystallizes as cubic, space group Fd3m, with a = 10.4252(17) A, V = 1133.1(3) A(3), and Z = 16. Structural analyses reveal a one-dimensional beeline-chained structure, which consists of VO(6) octahedra in I. Compound II possesses a two-dimensional V-O-layered structure formed by VO(5) square pyramids; protonated imidazole and remaining NH(4+) cations are inserted between the layers. The three-dimensional open framework of III with the pyrochlore type consists of V(12) and V(4) secondary building units by using VO(6) octahedra as building units.