Liansheng Cui

Synthesis, crystal structures and photoluminescent properties of two Cd(II)/Zn(II) coordination polymers with rarely 8-/2-fold interpenetrated based on 4,4′-stilbenedicarboxylic acid and imidazole ligands

Abstract Two coordination polymers, [Cd(sbdc)(bmib)]n (1) and {[Zn(sbdc)(tib)]·0.5H2O}n (2) (H2sbdc = 4,4′-stilbenedicarboxylic, bmib = 1,4-bis(2-methylimidazol-1-yl)butane, tib = 1,3,5-tris(1-imidazolyl)benzene), have been synthesized under solvothermal conditions, characterized by elemental analysis, infrared spectra, thermogravimetric analysis, and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis reveals that 1 and 2 show 8-fold and 2-fold interpenetrating 3-D frameworks, respectively. Complexes 1 and 2 display a 4-connected (66) sqc6 and a 4-connected (44·62) sql topology, respectively. Photoluminescent and thermal properties of 1 and 2 have also been investigated.

Syntheses, structural diversity, magnetic properties and dye absorption of various Co(II) MOFs based on a semi-flexible 4-(3,5-dicarboxylatobenzyloxy)benzoic acid

Five novel Co(II) metal–organic frameworks (MOFs) constructed from semi-flexible 4-(3,5-dicarboxylatobenzyloxy)benzoic acid (H3L), namely {[Co1.5(HL)(4,4′-bidpe)2(H2O)]·3H2O}n (1), {[Co3(L)2(4,4′-bibp)3(μ2-O)2]·2H2O}n (2), {[Co(HL)(1,3-bitl)]·(1,4-Diox)}n (3), [Co2(HL)2(3,5-bipd)2]n (4), and {[Co(HL)(tib)]·0.5H2O·NMP}n (5) (4,4′-bidpe = 4,4′-bis(imidazolyl)diphenyl ether, 4,4′-bibp = 4,4′-bis(imidazol-1-yl)biphenyl, 1,3-bitl = 1,3-bis(1-imidazoly)toluene, 3,5-bipd = 3,5-bis(1-imidazoly)pyridine, and tib = 1,3,5-tris(1-imidazolyl)benzene), were synthesized under solvothermal conditions and further characterized by elemental analysis, IR spectra, powder X-ray diffraction (PXRD), thermogravimetric (TG) analysis and single-crystal X-ray diffraction. Different architectural topologies have been generated by adjusting the N-donor ligands. Single-crystal X-ray diffraction analysis reveals that complex 1 shows a rare 1D → 2D polyrotaxane network. Complex 2 possesses an unprecedented 2-nodal (3,10)-connected 3D framework with a Schlafli symbol of (43)2(46·632·83)(43)2. When the 2-connected points (H3L and 1,3-bitl ligands) are not calculated, complex 3 shows a hcb uninodal 3-connected 2D network with the Schlafli symbol (63), which further constructs a 3D supramolecular structure through O–H⋯O hydrogen bonds; while the 2-connected points are taken into account, complex 3 exhibits an unprecedented 3-nodal (2,2,4)-connected network. Complex 4 presents an unprecedented 2-nodal (3,5)-connected 3D framework with a (4·62)(4·66·83) topology, while complex 5 exhibits another unprecedented 2-nodal (3,5)-connected 2D framework with a (42·67·8)(42·6) Schlafli symbol and shows 2D → 3D supramolecular structure through O–H⋯O hydrogen bonds. Meanwhile, the magnetic properties of complexes 2 and 4 are discussed. Moreover, the dye adsorption and mechanism studies indicate that the pore size, the uncoordinated O atoms in carboxyl groups and the uncoordinated carboxyl groups of the MOFs have significant effects on the dye adsorption capacity.

Synthesis, Crystal Structures, Photocatalysis for Rhodamine B Degradation of a Organobismuth (V) Dithiocarbamate Polymer [PhBiS2CN(C2H5)2Cl]n

A organobismuth (V) dithiocarbamate complex, [PhBiS2CN(C2H5)2Cl]n has been synthesized and characterized by IR, element analysis, 1H NMR and X-ray diffraction single crystal analysis. The complex crystallizes in the monoclinic crystal system, space group P2(1)/c. is coordinated by two sulphur atoms, a carbon atom from benzene ring and two chlorine atoms. The complex leads to one-dimensional zigzag chain structure by a bridging chlorine atom to link metal ions and two adjacent chains are bridged by C–H⋯C interactions. Furthermore, the photocatalytic experiments of the complex on degradation of rhodamine B (RhB) manifest that the complex is good candidate for the photocatalytic degradation of RhB.