Crystal engineering of Cu-containing metal–organic coordination polymers under hydrothermal conditions

A 3-D metal-organic framework constructed with manganese(ΙΙ), 4,4'-oxybis(benzoic acid) and 2,2'-biphenyl: synthesis, crystal structure and photoelectric property characterization

Assembly of 4,4'-oxybis(benzoic acid) (H(2)L) with manganese chloride in the presence of 2,2'-biphenyl (2,2'-bpy) affords a new coordination polymer [Mn(3)L(3)(2,2'-bpy)(2)](n) (1), in which the [MnL(2)]n layers are extended by L bridges resulting in a three-dimensional (3-D) coordination framework. The network structure of 1 has unusual (2,6)-connectivity and represents a new type of (8(12) · 12(3))(8)(3) topology. These identical and complementary networks are entangled to generate a self-penetrating supramolecular lattice. Moreover, the fluorescence spectrum of 1 exhibits fluorescent emission in the solution of methanol at room temperature. Electrochemical investigation illustrates the electrochemical properties of the title compound. The structure (C(62)H(40)Mn(3)N(4)O(15))(n) is monoclinic with a = 14.2304(18), b = 17.019(2), c = 25.805(3) Å, α = γ = 90, β = 92.932(2)° and space group C2/c.

Fluorescent, Theoretical and Structural Investigations on [Me4bim][CdCl4] (Me4bim = 1,1′,3,3′-tetramethyl-2,2′-bi-1H-imidazolium)

The compound [Me4bim][CdCl4] (Me4bim = 1,1′,3,3′-tetramethyl-2,2′-bi-1 H-imidazolium), has been prepared via a solvothermal reaction and has an isolated (0-D) structure. It displays an emission in the blue region that is ascribed to ligand-to-ligand charge transfer on the basis of a theoretical investigation.

In situ ligand and complex transformation of an iron(III) Schiff base complex: structural evidence and theoretical calculations

A C-C coupling reaction has been achieved at room temperature by in situ ligand transformation. The iron(III) complexes before and after the in situ transformation, [FeNaL(1)(2)(H(2)O)(4)](2)·2H(2)O (1) (H(2)L(1) = (Z)-2-(2-hydroxyl)benzylideneamino) and [FeL(2)](2)·7.5H(2)O (2) (H(3)L(2) = (E)-2-(2-hydroxyl-benzylideneamino)-3-hydroxyl-3-(2-hydroxyphenyl), have been studied by elemental analyses, FT-IR, UV-vis, TGA and X-ray single crystal diffraction analysis. The proposed mechanism of this in situ transformation has been determined based on structural evidence and theoretical calculations using the density functional theory (DFT) M06 method.

Bis{μ-2-[3-carboxylatomethyl-4-(phenylsulfanyl)phenyl]propanoato-κ4O,O′:O′′,O′′′}bis[(2,2′-bipyridine-κ2N,N′)cadmium]

In the title complex, [Cd₂(C₁₇H₁₄O₄S)₂(C₁₀H₈N₂)₂], which was hydro­thermally synthesized, the Cd^II cation is hexa­coordinated in a distorted octa­hedral geometry by two N atoms from a 2,2′-bipyridine ligand and by four O atoms from two different 2-[3-carboxyl­atometh­yl-4-(phenyl­sulfan­yl)phen­yl]propano­ate ligands, forming a cyclic dimetallic complex.

Copper(I) coordination polymers of 2,2'-dipyridylamine derivatives: syntheses, structures, and luminescence

Reactions of CuX (X = Br(-), I(-) or CN(-)) with various types of 2,2'-dipyridylamine (dpa) derivatives have been performed via a hydrothermal-solvothermal method and the products have been structurally characterized by X-ray crystallography. Four ligands with different coordination motifs were employed in the reactions, including angular N,N,N',N'-tetra(2-pyridyl)-2,6-pyridinediamine (tppda); linear N,N,N',N'-tetra(2-pyridyl)-1,4-phenylenediamine (tppa) and N,N,N',N'-tetra(2-pyridyl)biphenyl-4,4'-diamine (tpbpa); and star-shaped tris-[4-(2,2'-dipyridylamino)-phenyl]amine (tdpa), which yielded eight copper(I) complexes exhibiting different stoichiometries of Cu-dpa and variable coordination modes of dpa. The compound [Cu(2)(tppda)(μ-I)(2)](n) (1) forms a one dimensional (1D) coordination polymer exclusively through double μ(2)-I bridges, which arranges to two dimensional (2D) metal-organic frameworks (MOFs) via the face-to-face π···π stacking interactions from pyridyl rings. The compound [Cu(6)(tppa)(μ(3)-Br)(6)](n) (2) forms a 2D network linked through multiple μ(3)-Br bridges. The compound [Cu(2)(tppa)(μ-CN)(2)](n) (3) is also a 2D MOF containing 1D (CuCN)(n) chains. The compounds [Cu(tpbpa)Br](n) (4) and [Cu(4)(tpbpa)(2)(μ-I)(4)](n) (5) display two different 1D assemblies: a zig-zag chain for 4 and a linear structure for 5. The compound [Cu(4)(tpbpa)(μ-CN)(4)](n) (6) shows a pseudo-4,8(2) topological net, while the compound [Cu(8)(tpbpa)(μ-CN)(8)](n)·2nH(2)O (7) exhibits a three-dimensional (3D) framework containing a ···PM··· double helical structure, although both of them contain (CuCN)(n) chains. The compound [Cu(2)(tdpa)(μ-I)(2)](n) (8) is a zig-zag chain based on the star-shaped molecule tpda, in which one of three dpa-arms is free of coordination to metal ions. All complexes exhibit luminescence in the solid state.

Multi component self-assembly: supramolecular organic frameworks containing metal-rotaxane subunits (RSOFs)

A facile, one-pot synthesis of rotaxanated supramolecular organic frameworks (RSOFs) is reported. These systems consist of bis-carboxylate anions threaded through the core of tetraimidazolium macrocycles. Trivalent metal cations, yttrium(III) and smaller lanthanides, are used to "lock" the threaded strut in place. This results in the formation of three-dimensional RSOFs.