Guang-Xiang Liu

Two novel coordination polymers, [Zn₂(CAM)₂(Titmb)] (I) and [Zn₄Co(OH)₂(BTEC)₂ (Titmb)₂(H₂O)₂] · 2H₂O (II) (H₂CAM = camphor acid, H₄BTEC = 1,2,4,5-benzenetetracarboxylic acid, and Titmb = 1,3,5-tris(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene), have been hydrothermal prepared and characterized by IR spectroscopy, elemental analysis, and single-crystal X-ray diffraction. Complex I displays an unusual three-dimensional (3,4,6)-connected network with (4.6⁴.8)₂(4².6⁴.8⁹)(6².8)₂ topology. Complex II exhibits an interesting heterometallic 3D metal-organic framework. Moreover, the luminescent properties of I have been investigated in the solid state at room temperature.

Two new complexes, Zn(Glut)(Bix) · 2H₂O (I) and Cd(Pda)(Bimb) (II) (H₂Glut = glutaric acid, H₂Pda = 1,3-phenylenediacetic acid, Bix = 1,4-bis(imidazol-1-ylmethyl)benzene and Bimb = 1,4-di(1H-imidazol-1-yl)butane) were obtained under hydrothermal conditions by employing mixed ligands with metal salts and characterized by elemental analysis, IR, TGA, and Single crystal X-ray diffraction. Complex I presents a two-dimensional 2-fold interpenetrating layer structure. Whereas complex II is a two-dimensional layer network and exhibits a typical (4,4) topological net. The infrared spectra, thermogravimetric and luminescent properties were also investigated in detail for two complexes.

To investigate the effect of organic anions on the coordination frameworks, we synthesized three new complexes, namely, Co(SDBA)(BIMB) (1), Co₂(SA)(BIMB)_1.5(H₂O) (2) and Co(FBA)(BIMB)_0.5·H₂O (3) (H₂SDBA = 4,4′-dicarboxybiphenylsulfone, H₄SA = 3,3′,4,4′-diphenylsulfonetetracarboxylate acid and H₂FBA = 4,4′-(hexafluoroisopropylidene)bis(benzoic acid)), which were obtained by the reactions of 4,4′-bis(1-imidazolyl)biphenyl (BIMB), and three V-shaped aromatic polycarboxylates as organic anions with Co(NO₃)₂·6H₂O. Single crystal structure analysis shows that complex 1 features a 3-fold interpenetrating three-dimensional (3D) framework with CdSO₄-type topology. Complex 2 has a previously unknown 3D trinodal (4,4,6)-connected framework with a Schläfli symbol of (4·6⁴·8)₂(4³·6³)₂(4⁴·6¹⁰·8). Complex 3 exhibits a three-dimensional 2-fold interpenetrating pillared helical-layer open framework of α-Po topology based upon binuclear paddlewheel units. The results reveal that the carboxylic building blocks with different conformations play a significant role in promoting the diversity of the observed structural motifs. The magnetic properties of the three complexes as well as the SHG and ferroelectric properties for 1 have also been investigated. Finally, theoretical calculations were carried out on the conformation of the BIMB ligand in the three complexes.

The asymmetric unit of the title compound, (C₁₄H₁₅N₂O₂)[Ni(C₆H₄S₂)₂], contains one cation and two halves of two centrosymmetric crystallographically independent anions. In the anions, the Ni^IIIatoms are coordinated by four S atoms in a distorted square-planar geometry. In the cation, the dihedral angle between the pyridine and benzene rings is 88.66 (17)°. In the crystal, anions and cations interact through C—H...S and C—H...O hydrogen bonds.

A 3 d-3 d heterometallic coordination polymer, M(Bpp)(BDC) ( I) (M = Co and Zn, Bpp = 1,3- bis(4-pyridyl)propane and H2BDC = 1,4-benzenedicarboxylic acid), has been prepared by hydrothermal synthesis...

Four new coordination polymers, namely, [Co(BIPA)(titmb)]·H₂O (1), [Co₃(BIPA)₃(titmb)₂]·0.73H₂O (2), [Ni(SDBA)(bix)]·2H₂O (3) and [Ni(SDBA)(bix)(H₂O)]·0.38H₂O (4) (H₂BIPA = 5-bromoisophthalic acid, H₂SDBA = 4,4′-dicarboxybiphenyl sulfone, titmb = 1,3,5-tris(imidazol-1-ylmethyl)-2,4,6-tri-methylbenzene, bix = 1,4-bis(imidazol-1-ylmethyl)benzene), were obtained under hydrothermal conditions. Four complexes were characterized by elemental analyses, IR spectra, thermogravimetric analyses and single-crystal X-ray diffraction. Complexes 1 and 2 are polymorphs formed from Co(II) cations, BIPA^{2 −} anions, titmb ligands and water molecules, showing a three-dimensional (3,5)-connected network with the topology of (6³)(6⁹.8) for 1 and a three-dimensional (3,4)-connected coordination framework with the topology of (4.6.8)(4.6².8³)(6.8⁵)(6².8³.10)(8³) for 2. Complexes 3 and 4 are also two polymorphs constructed from Ni(II) cations, SDBA^{2 −} anions, bix ligands and water molecules. Complex 3 exhibits a two-dimensional lamella structure with (4,4) topology, whereas complex 4 displays a two-dimensional 2-fold interpenetrating (6,3) network. It is shown that the reaction temperature plays a crucial role in the formation of the final products. Moreover, the nonlinear optical and ferroelectric properties of 1 have also been investigated.

Two cadmium(II) entangled frameworks, Cd(BIPA)(bpe)_1.5 (1) and Cd(BIPA)(bpp)(H₂O) (2), were prepared by hydrothermal reactions based on rigid 5‐bromoisophthalic acid (H₂BIPA) and two flexible bipyridyl ligands 1, 2‐bis(4‐pyridyl)ethane (bpe) and 1, 3‐bis(4‐pyridyl)propane (bpp). The complexes were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, and single‐crystal X‐ray diffraction. Complex 1 is a rare example of a polycatenated array of 1D nanotubes, whereas complex 2 exhibits a three‐dimensional twofold interpenetrating diamondoid network. The analysis results reveal that the flexibility of the bipyridyl ligands plays a significant role in the structure of the final products. Moreover, the luminescent properties of the complexes were investigated.