A New 1D Cadmium Coordination Polymer Based on N- and O-donor Ligands: Synthesis, Structure and Luminescent property

One new cadmium coordination polymer, [Cd（nbdc）（dmpy）]n （1, H2nbdc = 2-nitro- terephthalic acid, dmpy = 5,5′-dimethyl-2,2′-bipyridine） has been synthesized under hydrothermal conditions and characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis （TGA）, and single-crystal X-ray diffraction. Complex 1 is of monoclinic system, space group C2/c with a = 11.7684（9）, b = 24.3715（19）, c = 13.9898（11） , β = 107.652（2）°, V = 3823.5（5） 3, C20H15N3O6Cd, Z = 8, Mr = 505.75, Dc = 1.757 g/cm3, μ（MoKα） = 1.187 mm-1, F（000） = 2016, the final R = 0.0207 and wR = 0.0560 for 3034 observed reflections with I 〉 2σ（I）. 1 exhibits an interesting one-dimensional double chain structure. Furthermore, the luminescent property of 1 has also been investigated.

Two Unusual Two-dimensional （4,4） Network Cadmium Coordination Polymers Based on Flexible Bis（triazole） and Rigid Benzenedicarboxylate Co-ligands

Two cadmium（II） coordination polymers {[Cd（btp）（NO2-1,3-bdc）（H2O）]·H2O}n （1） and {[Cd（btp）（1,2-bdc）（H2O）]·H2O}n （2） were synthesized by the reaction of 1,3-bis（1,2,4-triazol-1-yl）propane （btp）, 5-nitroisophthalate （NO2-1,3-bdc）, and 1,2-benzenedicarboxylate （1,2-bdc）. 1 consists of undulated 2D （4,4） networks. Two identical undulated layers are parallel stacking to give a （2D→2D） polythreaded 2D network. A 3D supramolecular architectute is constructed through the hydrogen bond interactions. 2 has an unusual 2D （4,4） network with a thickness of ca. 10A. The btp ligands exhibit the anti-gauche conformation in 1 and the anti-anti conformation in 2. The flexible btp ligand exhibits the key role in the assembly of the topologies of 1 and 2. The luminescence and thermal stability were investigated.

Synthesis, Crystal Structure and Luminescence of a Cadmium(Ⅱ) Coordination Polymer with 3,6-Connected rtl Topology

A new cadmium（Ⅱ） coordination polymer,[Cd（Hcna）2]n（1）,was hydrothermally synthesized based on 5-（4-carboxyphenoxy）nicotinic acid（H2cna） organic linker.X-ray singlecrystal diffraction determination reveals that 1 crystallizes in the monoclinic P21/c space group,with a = 10.101（2）,b = 7.9139（17）,c= 15.627（3） A,β= 103.364（3）°,V= 1215.4（4） A^3,Z=2,Mr= 628.81,Dc = 1.718 Mg/m^3,μ= 0.963 mm^（-1）,F（000） = 628,the final R = 0.0177 and wR = 0.0432 for 2263 observed reflections with I 〉2σ（I）.In 1,the Cd（Ⅱ） cations are connected by nicotiniate units to form a two-dimensional（2D） layer,and it is further linked through benzoate units to form a three-dimensional（3D） structure.Topologically,the structure of 1 represents a 3,6-connected 3D rtl topology.Furthermore,thermal stability and photoluminescent property of 1 have also been investigated.

A One-dimensional Cd(Ⅱ)Coordination Polymer Constructed from 1,4-Benzene-dicarboxylic Acid and 3-(2,6-Di(pyrazin-2-yl)pyridin-4-yl)-1H-indole:Synthesis,Structure and Photoluminescence

A new coordination polymer {[Cd（C_（21）H_（14）N_6）（C_8H_4O_4）]·H_2O}_n（1） was synthesized by an elaborate design via the reaction of 3-（2,6-di（pyrazin-2-yl）pyridin-4-yl）-1H-indole（bppi）,1,4-benzene-dicarboxylic acid（H2bdc） and cadmium（Ⅱ） nitrate in CH_3OH/H_2O mixed solvents. Complex 1 crystallizes in orthorhombic,space group Ccca with a = 20.012（4）,b = 31.881（6）,c = 19.808（4） ？,V = 12638（4） ？~3,Z = 16,C_（29）H_（20）CdN_6O_5,M_r = 644.91,D_c = 1.356 g·cm^（-3）,μ = 0.735 mm^（-1）,F（000） = 5184,GOOF = 1.046,the final R = 0.0405 and wR = 0.1063 for 6870 observed reflections（I 〉 2σ（I））. The Cd（Ⅱ） centre is hepta-coordinated by three N and four O atoms from one bppi terminal ligand and two bdc2– ligands,respectively,displaying a capped trigonal prism geometry. Structure extension gives coordination polymeric chains,in which the bdc2– linkers connect Cd（Ⅱ） cations into a one-dimensional（1D） coordination polymer along the c axis,giving zigzag chains with the Cd···Cd separation of 11.178（1） ？. The adjacent bppi terminal ligands in the chains are anti-periplanar conformation. The three-dimensional（3D） structure is stabilized by π···π stacking and hydrogen-bonding interactions to form a supramolecular self-penetrating network with 1D channels. In 1,there are voids 2999.7 ？~3 with 23.7% of per unit cell volume. Thermal analysis indicates that the framework of 1 is stable until 651 K and the photoluminescence of 1 in the solid shows very weak fluorescence at 382 and 560 nm upon excitation at 310 nm.

Synthesis,Characterization and Crystal Structure of a Three-dimensional Coordination Polymer {[Cd(1,5-nds)(Him)_2(H_2O)]·2H_2O}n

A novel cadmium（Ⅱ） coordination polymer {[Cd（1,5-nds）（Him）2（H2O）]·2H2O}n （1,5-nds = naphthalene-1,5-disulfonate and Him = imidazole） was synthesized based on the reaction of cadmium oxide and 1,5-naphthalenedisulfonic acid firstly, and then mixed with imidazole in methanol medium. Its structure was characterized by elemental analysis, IR and TGA, respectively. The crystal structure was determined by single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P1, with a = 8.5420（10）, b = 10.2570（10）, c = 13.361（2） A, α = 100.704 （2）, β = 100.195（2）, γ = 108.873（3）°, C16H20Cd N4O9S2, Mr= 588.91, V = 1.0524（2） nm^3, Dc = 1.858 g/cm^3, Z = 2, F（000） = 592, β^ = 1.294 mm-1, R = 0.0397 and wR = 0.1007 for 3180 observed reflections （Ⅰ〉 2σ（Ⅰ））. Structural analysis shows that the cadmiun atom is coordinated with four oxygen atoms from three 1,5-nds and one water molecule together with two nitrogen atoms from two imidazoles, giving a distorted octahedral coordination geometry. The molecules are linked to form a two-dimensional coordination polymer based on bridging ligands of naphthalene- 1,5-disulfonate anions, the sheets of which are then interacted via hydrogen bonds, leading to a three-dimensional network structure.

Crystal Structure and Luminescence of a Cd(Ⅱ) Compound Based on the 3,3’,5,5’-Tetrafluorobiphenyl-4,4’-dicarboxylate and Adenine Ligands

A one-dimensional(1 D) coordination polymer, [Cd2(TFBPDC)2(ad)2(CH3 OH)2]n(1), based on the 3,3’,5,5’-tetrafluorobiphenyl-4,4’-dicarboxylate(TFBPDC2-) and adenine(ad) ligands, was synthesized. Compound 1 crystallizes in the triclinic system, space group P1 with a = 9.7067(3), b = 9.9501(3), c = 11.6903(4) ?, α = 93.036(3), β = 107.793(3), γ = 107.107(3)°, V = 1014.77(6) ?3, Z = 2, C40H26F8N10O10Cd2, Mr = 1183.51, Dc = 1.937 g/cm3, μ = 1.160 mm-1, F(000) = 584, the final R = 0.0284 and wR = 0.0635 for 3791 observed reflections with Ⅰ> 2s(I). In 1, a pair of adenine(ad) ligands bridge two octahedrally coordinated Cd(Ⅱ) atoms to form a dinuclear [Cd2(ad)2] unit, which is linked by TFBPDC2- to generate a 1 D double chain. The neighboring chains are connected by N-H×××O hydrogen bonds to give a two-dimensional(2 D) layer, which is further linked by the O-H×××N hydrogen bonds to give a three-dimensional(3 D) supramolecular framework. IR spectrum, thermogravimetric analysis, and powder X-ray diffraction of 1 were provided. Compound 1 shows luminescent emission.