title: Three new organically templated 1D, 2D, and 3D vanadates: synthesis, crystal structures, and characterizations.
abstract: 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.
authors: Institute of Chemistry for Functionalized Materials, College of Chemistry and Chemical Engineering, Liaoning Normal University, No. 850, Huanghe Road, Dalian 116029, People's Republic of China. yanxu@lnnu.edu.cn
authors: Yan
authors: Y
authors: Xu
authors: Guangpeng
authors: G
authors: Zhou
authors: Dunru
authors: D
authors: Zhu