Inorganic−Organic Hybrid Materials with Novel Framework Structures: Synthesis, Structure, and Magnetic Properties of [Ni(py)₄]₂V₁₀O₂₉ and [Ni₂(py)₅(H₂O)₃]V₄O₁₂

Abstract

Inorganic-organic hybrid materials [Ni(py) 4 ] 2 V 10 O 29 (1) and [Ni 2 (py) 5 (H 2 O) 3 ]V 4 O 12 (2) have been synthesized and characterized by infrared spectroscopy, thermogravimetry, magnetometry, and complete single crystal structure analysis. The crystal structures of 1 and 2 exhibit novel three-dimensional covalent networks. The framework structure in 1 contains polyoxometallate groupings of stoichiometry {V 10 O 29 } which are constructed from two cyclic {V 4 O 12 } units bound to centrosymmetric {V 2 O 7 } species. V-O-Ni bridges in the a-and b-directions join these units to two crystallographically independent trans-[Ni(py) 4 O 2 ] octahedra. The nickel-and vanadium-based moieties occupy alternating channels along the c-direction. The structure of 2 consists of octahedral species [Ni(py) 3 (H 2 O)O 2 ] and [Ni(py) 2 (H 2 O) 2 O 2 ] which are linked into a three-dimensional covalent network by the sharing of oxygen atom vertices with tetrahedral {VO 4 } groups. Compounds 1 and 2 are thermally stable up to 200 and 175 °C, respectively.Both compounds show Curie-Weiss type magnetic behavior over the temperature range 1.9-300 K. The effective magnetic moment in both cases is 3.0 µ B , revealing the presence of significant orbital contribution. Single ion magnetization as a function of magnetic field showed linear behavior for 1 and 2 over the range of 0-1 T. At a magnetic field of 9 T, 1 approaches saturation at 2 µ B per Ni 2+ ion, whereas 2 does not approach saturation well.

Crystal structure of aqua-[(2,2'-bipyridine)]-[(2,4-dihydroxypyrimidine- 5-carboxylato)] perchloratocopper(II), Cu(H2O)(C10H8N2)(C5H3N2O4)(ClO4), C15H13ClCuN4O9

“…The remarkable progress in crystal engineering has provided aw ide range of hybrid systemswith potential applications and novel topologies [1][2][3][4][5][6]. However, controlling the unique orientation of organic ligands in hybrid systemsand thus prediction of the resultings tructure representa na ppealingc hallenges.…”

Synthesis, Characterization and In Vitro Antitubercular and Antimicrobial Activities of new Aminothiophene Schiff Bases and Their Co(II), Ni(II), Cu(II) and Zn(II) Metal Complexes

“…4800 Å, c = 17.4500 Å and b = 11.4440 Å. The [Ni(L 1 )Cl] complex crystallizes in an orthorhombic system with space group Pca21 37 . The observed average grain size for the [Ni(L 1 )Cl] was 47 nm 38 .…”

Crystal structure of bis(2-aminoanilinium) hydrogen phosphate

“…) and dihydrogen phosphate (H 2 PO 4 À ) compounds provide a class of materials with numerous practical and potential uses in various fields such as biomolecular sciences, catalysis, liquidcrystal-material development, ferroelectrics, non-linear optical and supramolecular studies (Khan et al, 2009;Evans et al, 2008;Balamurugan et al, 2010). Non-covalent interactions, such as hydrogen bonding and other weak interactions, represent the basic set of tools for the construction of elaborate supramolecular architectures of organic or inorganic-organic compounds.…”