an-Wei Ji

Two 3D chiral coordination polymers with 4-connected 66 topological net: synthesis, structure and magnetic properties

The hydrothermal reaction of Co(II)/Cu(II), 5-hydroxyisophthalic acid and dipyridophenazine leads to the generation of two 3D chiral coordination polymers, [M(hip)(DPPZ)](n) (M = Co(), Cu(), H(2)hip = 5-hydroxyisophthalic acid, DPPZ = dipyridophenazine), which contain M-hip-M helical chains (M = Co, Cu) and possess a new four-connected 6(6) topological net. The resulting crystals were not a racemic mixture but an enantiomeric excess, which was confirmed by the measurement of optical rotation of the bulk samples using solid state vibrational circular dichroism (VCD) and solid circular dichroism (CD) based on the large crystals from one crystallization. The magnetic properties of 1 and 2 have been investigated by variable-temperature magnetic susceptibility and magnetization measurements, and the results reveal that antiferromagnetic interactions exist in 1 and 2.

Hydrothermal synthesis and structural characterization of a new coordination polymer [In(Pdc)(OH)(2,2′-Bipy)]n(H2Pdc = 3,5-pyridinedicarboxylic acid, 2,2′-bipyridine)

AbstractA novel coordination polymer, [In(Pdc)(OH)(Bipy)]n(I) (H2Pdc is 3,5-pyridinedicarboxylic acid, Bipy is 2,2′-bipyridine), has been hydrothermally synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. The X-ray diffraction analysis reveals that I crystallizes in the triclinic crystal system, space group P

Ionothermal syntheses of two new 2D metal-organic frameworks: (EMIM)2[M(Pydc)2] (M = Co, Zn)

\bar 1

A new 2D rhombic network metal-organic framework: (H3O+)[In(Tbip)2] · H2O (H2Tbip = 5-tert-butylisophthalic acid)

and features an interesting 1D linear chain structure, which contains dinuclear [In2(Pdc)2(Bipy)2] subunits. The cell unit parameter for I: a = 8.629(1), b = 9.802(2), c = 10.227(2) Å, α = 79.20 (1)°, β = 76.08(1)°, γ = 71.44 (1)°, and Z = 2.

A 3D chiral porous In(III) coordination polymer with PtS topological net

A new coordination polymer, [Cd(HMal)(Bipy)(H2O) · 2H2O (I) (H3Mal is malic acid, Bipy is 4,4′-bipyridine), has been synthesized from H3Mal and Bipy under hydrothermal conditions and characterized by elemental analysis, IR, TG, and single-crystal X-ray diffraction. The X-ray diffraction analysis reveals that I (C14H16N2O7Cd) crystallizes in the orthorhombic system, space group Ibam. The adjacent cadmium(II) atoms were first interconnected by the HMal ligands via carboxylate oxygen atoms and its adjacent hydroxyl group to generate an infinite zigzag [Cd(HMal)]n chain, which are further linked by Bipy ligands to form a 2D wavelike layer. Interestingly, the adjacent layers are further connected via hydrogen bonds, giving rise to a 3D porous framework with a cross-sectional area of 11.690 × 9.326 Å2. The unit cell parameters for I: a = 8,457(1), b = 22.030(7), c = 23.066(7) V = 4297(2) Å3, Z = 4.

Synthesis and Crystal Structure of a 1D Coordination Polymer [Cd(pydc)(phen)]n (H2pydc = pyridine-2,3-dicarboxylic acid, phen = 1,10-phenanthroline)

Two new coordination polymers, (EMIM)2[M(Pydc)2] (M is Co, Zn; EMIM is 1-ethyl-3-methylimidazolium; H2Pydc is 2,5-pyridinedicarboxylic acid), have been synthesized through the reaction of cobalt or zinc nitrate with H2Pydc in the ionic liquid medium. The structures exhibit a two-dimensional 4.4-network with the imidazolium cations, acting as charge compensating agent, located between the layers of the coordination anion polymeric frameworks.

Ionothermal synthesis of a new cobalt metal-organic framework based on tetranuclear cobalt clusters

To investigate the influence of the size of aromatic chelate ligands on the frameworks of metal dicarboxylate polymers, two one-dimensional coordination compounds [Cu(BDC)(TATP)(H2O)]n (I) and [Cu(BDC)(DPPZ)]n (II), (BDC = 1.4-benzenedicarboxylate, TATP = 1,4,8,9-tetranitrogentrisphene, DPPZ = dipyrido[3,2-a:2′,3′-c]phenazine) were synthesized under similar conditions and structurally characterized by X-ray crystallography. Compounds I and II have the similar zigzag chain structure, but the substitution of TATP with DPPZ results in the difference of the degree of bending of the chain, indicating that the sizes of the rigid aromatic chelate ligands have important effect on the structures of their complexes.

Structural assemblies of four Cd(II) coordination polymers based on 5-methylisophthalic acid

A new coordination polymer (H3O+)[In(Tbip)2] · H2O (I) (H2Tbip is 5-tert-butylisophthalic acid) has been synthesized under hydrothermal conditions. Complex I has been characterized by elemental analysis, IR, TG analysis, and powder X-ray diffraction. Single-crystal X-ray diffraction studies revealed that I crystallizes in the monoclinic crystal system, space group C2/c. In I the metal centers are linked by bridging Tbip ligand to form an interesting extended two-dimensional rhombic network.