title: Two extended structures constructed from sandwich-type polyoxometalates functionalized by organic amines.
abstract: Two new compounds constructed from tetra-Ni-substituted sandwich-type polyoxometalates functionalized by organic groups, (NH(4))(2)[Ni(4)(enMe)(8)(H(2)O)(2)Ni(4)(enMe)(2)(PW(9)O(34))(2)].9H(2)O (enMe = 1,2-diaminopropane) (1) and Na(2)[H(6)N(2)(CH(2))(6)](2){Ni(4)[H(4)N(2)(CH(2))(6)](2)(H(2)PW(9)O(34))(2)}.7H(2)O (2), have been successfully synthesized under hydrothermal conditions. Single-crystal X-ray diffraction analysis is carried out on these two compounds (1 and 2), which both crystallize in the triclinic system. Compound 1 represents the first example of a 2D layer structure consisting of the sandwich-type polyoxoanions with six supporting [Ni(enMe)(2)](2+) moities and two organic functionalized groups. Compound 2 exhibits a 1D chain-like structure based on sandwich-type polyoxoanions and sodium cations, which are further connected into a 2D layer structure via hydrogen-bonding interactions between the 1,6-hexanediamine molecules and the sandwich-type [Ni(4)(H(4)N(2)(CH(2))(6))(2)(H(2)PW(9)O(34))(2)](6-) polyoxoanions. A magnetic study of the two compounds indicates that intramolecular ferromagnetic Ni-Ni interactions exist in the tetranuclear metal cluster.
authors.affiliation: Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Changchun, Jilin 130024, P. R. China.
authors.forename: Zhiming
authors.initials: Z
authors.lastname: Zhang
authors.forename: Jia
authors.initials: J
authors.lastname: Liu
authors.forename: Enbo
authors.initials: E
authors.lastname: Wang
authors.forename: Chao
authors.initials: C
authors.lastname: Qin
authors.forename: Yangguang
authors.initials: Y
authors.lastname: Li
authors.forename: Yanfei
authors.initials: Y
authors.lastname: Qi
authors.forename: Xinlong
authors.initials: X
authors.lastname: Wang
mesh_terms: D000588:Amines / Q000737:chemistry*; D018360:Crystallography, X-Ray; D008280:Magnetics; D008670:Metals / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D009930:Organic Chemicals / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D000588:Amines; D008670:Metals; D009930:Organic Chemicals; D010100:Oxygen