Synthesis, Structure and Characterization of a New 1D Coordination Polymer: [Pb(L)(cis-1,4-chdc)]·0.5H_2O

A new 1D coordination polymer, [Pb（L）（cis-1,4-chdc）]·0.5H2O （cis-1,4-chdc = 1,4-cyclohexanedicarboxylate and L = 2-（4-fluorophenyl）-1H-imidazo[4,5-f][1,10]phenanthroline）, has been synthesized under hydrothermal conditions and characterized by elemental analysis, TG and single-crystal X-ray diffraction. It crystallizes in triclinic, space group P1 with a = 9.153（5）, b = 10.338（5）, c = 13.074（5）, α = 80.956（5）, β = 89.725（5）, γ = 80.534（5）°, V = 1204.8（10）3 , Z = 1, C54H44F2N8O9Pb2 , Mr = 1401.35, Dc = 1.931 g/cm3 , F（000） = 678, μ（MoKa） = 7.055 mm-1 , R = 0.0277 and wR = 0.0559. Each cis-1,4-chdc anion coordinates with two Pb（Ⅱ） atoms in a bis-chelating coordination mode. In this way, cis-1,4-chdc anions bridged the neighboring Pb（Ⅱ） atoms to generate a 1D chain structure. The L ligands from neighboring chains are paired through the strong π-π interactions to generate a fascinating 2D supramolecular layer.

Synthesis and Crystal Structure of a New Mixed-ligand Nickel(II) Coordination Polymer: [Ni(L)(cis-1,4-chdc)]n·1.25nH_2O

A new one-dimensional Ni（Ⅱ） coordination polymer [Ni（L）（cis-1,4- chdc）]n·1.25nH2O has been synthesized under hydrothermal conditions by using 1,4-cyclohexanedicarboxylic acid （1,4-H2chdc） and 2-（3-fluorophenyl）- 1H-imidazo [4,5-f] [ 1,10]phenanthroline （L）. Crystallographic data for the compound： triclinic, space group Pi with a = 8.777（2）, b = 10.662（2）, c = 13.799（3） A, a = 89.480（4）, β = 73,933（3）, γ = 81.980（4）°, V = 1228.2（5） A3, Z = 2, C27H22.50FN4NiO5.25, Mr = 568.70, Dc = 1.527 g/cm3, F（000） = 583,μ（MoKα） = 0.846 mm-1, R = 0.0634 and wR = 0.1465. Neighboring Ni（Ⅱ） atoms are linked by the cis-1,4-chdc ligands to generate a one-dimensional chain structure. The π-π interactions between the L ligands of neighboring chains led to the formation of a two-dimensional supramolecular layer. The elemental analysis, IR spectrum and TG of the compound have been studied.

Properties of high cis-1,4 content hydroxyl-terminated polybutadiene and its application in composite solid propellants

In this paper,high cis-1,4 content hydroxyl-terminated polybutadiene(cis-HTPB)with different molecular weights was prepared through the oxidative cracking process using cis-butadiene rubber as raw material.Firstly,this article comprehensively compared the differences between cis-HTPB and conventional I-HTPB in terms of molecular weight distribution,functionality,viscosity,molecular polarity,and other physicochemical properties,which provided effective data support for its subsequent application.In addition,the reaction kinetics study showed that cis-HTPB with isocyanate curing agent has high reactivity,allowing it to be rapidly cured at low temperatures,and the cured elastomers had excellent mechanical properties,with tensile strength and elongation up to 1.89 MPa and 1100%,respectively.It was also found that cis-HTPB has extremely excellent low-temperature resistance,and the glass transition temperature(T_(g))of its cured elastomer is as low as-101℃.Based on the above studies,cis-HTPB is applied as a binder in composite solid propellants for the first time to investigate its practical performance,and the results indicated that cis-HTPB-based propellants have excellent process and mechanical properties.

Synthesis, Structure and Characterization of a New Iron Coordination Polymer:[Fe(L)(trans-1,4-chdc)]_n

A novel Fe（II） coordination polymer [Fe（L）（trans-1,4-chdc）];~ has been hydrother- mally synthesized by using 1,4-cyclohexanedicarboxylic acid （1,4-H2chdc） and 2-（2-fluoro- phenyl）-lH-imidazo[4,5-f][1,10]phenanthroline （L）. Crystallographic data： monoclinic, space group C2/c with a = 14.571（5）, b = 32.389（6）, c = 10.948（5）A, 18 = 115.186（5）°, V= 4676（3）A3, Z = 8, C27H21FFeN404, Mr = 540.33, De --- 1.535 g/cm3, F（000） = 2224, μ（MoKa） = 0.697 mmI, R = 0.0462 and wR = 0.1110. The two kinds of trans-l,4-chdc ligands link neighboring Fe（II） atoms to yield a two-dimensional layer structure. The π-π interactions between the L ligands of neighboring layers result in a three-dimensional supramolecular architecture. The IR and UV-vis spectra of the compound have been investigated in detail.

Synthesis, Crystal Structure and Properties of a New Zn(II) Coordination Polymer Constructed from 2,3-Pyridine Dicarboxylic Acid and 1,1′-(1,4-Butanediyl)bis(imidazole)

A new coordination polymer, namely [Zn（pdc）（bbi）]n {H2 pdc = 2,3-pyridine dicar- boxylic acid, bbi = 1,1-（1,4-butanediyl）bis（imidazole）}, has been prepared under hydrothermal conditions and characterized by elemental analysis, IR, and single-crystal X-ray diffraction. It crystallizes in monoclinic, space group P21 /n with a = 8.436（3）, b = 16.988（5）, c = 12.106（4）, β = 92.204（5）°, V = 1733.6（9）3, Z = 4, C17 H17 N5 O4 Zn, Mr = 420.73, Dc = 1.612 g/cm3, F（000） = 864, μ（MoKa） = 0.452 mm-1, the R = 0.0672 and wR = 0.1645. In the mononuclear complex, each Zn（II） is five-coordinated by one carboxylate O and one pyridyl N atoms from one pdc anion, one carboxylate O atom from another pdc anion, and two N atoms from two bib ligands. The Zn（II） ions are connected by pdc ligands to form skeleton chains, and bbi ligands further link them to construct a 2D framework. The thermal and luminescence properties of the complex were also investigated.

Synthesis, Crystal Structure and Biological Activity of Diethyl 1,4-dihydro-2,6-dimethyl-4-(4-methyl-1,2,3-thiadi azol-5-yl)pyridine-3,5-dicarboxylate

The title compound diethyl 1,4-dihydro-2,6-dimethyl-4-（4-methyl-1,2,3-thiadiazol- 5-yl） pyridine-3,5-dicarboxylate （C16H21N3O4S, Mr = 351.42） was prepared by the Hantszch reaction with 4-methyl-1,2,3-thiadiazole-5-formaldehyde, ethyl acetoacetate and ammonium acetate in the presence of aluminum chloride in alcohol, and its structure was characterized by IR spectra, 1H-NMR, EA, and single-crystal X-ray diffraction. The crystal of the title compound belongs to monoclinic system, space group P21/n with α= 11.300（2）, b = 12.771（3）, c = 12.826（3） ？, β = 96.55（3）o, V = 1839.0（6） ？3, Z = 4, Dc = 1.296 g/cm3, μ（MoKa） = 0.71073 mm-1, F（000） = 744, R = 0.0981 and wR = 0.1994. X-ray diffraction result shows that the torsion angles of N（1）–C（2）– C（3）–C（4） and C（2）–C（3）–C（4）–C（8） are 178.9（3）° and –130.3（3）°, respectively. All rings in the title compound are non-planar. The bioassay results indicate that the title compound has good fungicidal activity, good antivirus activity against tobacco mosaic virus and certain extent of insecticidal activity against Mythimna separata.

Synthesis,Crystal Structure and Characterization of a Cobalt Coordination Polymer:[Co(1,4-ndc)(L) (H_2O)]n

The title coordination polymer, [Co（1,4-ndc）（L）（H2O）]n 1 （1,4-H2ndc = 1,4-na- phthalenedicarboxylic acid and L =1-（5-（1H-imidazol- 1-yl）pentyl）- 1H-imidazole） has been hydrothermally synthesized and characterized by IR and single-crystal X-ray diffraction. It crystallizes in monoclinic, space group P21/n with a = 12.4333（12）, b = 13.2963（13）, c = 13.4678（13）A, α =β = 90°, y =107.302（2）°, V= 2125.7（4）A^3, Z = 4, CoC22H22N4O5, Mr = 481.37, De = 1.504 g/cm^3, F（000） = 996, μ（MoKa） = 0.850 mm^-1, R = 0.0472 and wR = 0.0984. Compound 1 exhibits a two-dimensional layer structure. The O-H...O and C-H...O hydrogen bonds stabilize the structure of 1.

Crystal Structure and Luminescent Property of a Coordination Complex Constructed with Pyrazine and 1,4-Phenylenediacetic Acid

A new coordination complex [Cd(pda)(pyz)(H2O)2]n(1, H2 pda = 1,4-phenylenediacetic acid, pyz = pyrazine) have been synthesized and structurally characterized. Crystal data for the title complex are as follows: orthorhombic system, space group Ccmb with a = 11.5245(3) b = 19.5069(5) c = 11.4231(3) A, V = 2568.00(12) A3, Mr = 188.31, Z = 16, F(000) = 1480, Dc = 1.948 g/cm3, μ(Mo Kα) = 1.725 mm-1, R = 0.0195 and w R = 0.0462 for 1357 observed reflections with I 】 2σ(I). In the title complex, the central Cd(II) ion is located in a distorted octahedral coordination environment. Two Cd(II) ions are bridged by two pda2- ligands and one pyz ligand to form a bi-loop structure. Luminescent property of the complex has also been studied.

Syntheses, Structures and Characteristics of Two New Cu(II) Coordination Polymers Based on 4-tert-butyl-phthalate and Different Bis(1,2,4-triazol-1-yl) Co-Ligands

Two new Cu（Ⅱ） coordination polymers, [Cu2（tbph）2（btb）2]n （1） and {[Cu2（tbph）2- （bth）2]·H2O}n （2）, （H2tbph = 4-tert-butyl-phthalic acid, btb = 1,4-bis（1,2,4-triazol-1- yl）butane, bth = 1,6-bis（1,2,4-triazol-l-yl）hexane）, have been synthesized and characterized by elemental analysis, FT-IR and X-ray single-crystal diffraction. Complex 1 has a 2D sql layer. Complex 2 shows a （3,4）-connected 2D sheet with a （4.6^4.8）（4.8^2） topology. The thermal behavior of the two cor- responding complexes has briefly been investigated.

Synthesis and Crystal Structure of a Dinuclear Cobalt(II) Complex [Co_2(1H-benzimidazole)_4(1,4-bdoa)_2]

A novel dinuclear complex with an empirical formula [Co2(1H-benzimidazole)4(1, 4-bdoa)2] (1,4-bdoa2– = benzene-1,4-dioxyacetate dianion) has been synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction. It crystallizes in monoclinic system, space group P21/c with a = 11.000(2), b = 19.385(4), c = 11.417(2) ?, β = 95.49(3)o, V = 2423.3(8) ?3, Z = 2, Mr = 1074.77, Dc = 1.473 g/cm3, μ = 0.760 mm–1, F(000) = 1108, the final R = 0.0645 and wR = 0.0714 for 3273 observed reflections (I > 2σ(I)). Two octahedrally coordinated Co(II) atoms are bridged by two 1,4-bdoa2– groups, generating a macrocyclic ring complex. The Co…Co separa- tion is 7.677(3) ?. An extended 3-D supramolecular network is formed through hydrogen bonds and weak π-π stacking interactions.

Synthesis and Crystal Structure of 7-Nitro-5-sulfo-napthalene-1,4-dicarboxylate Acid

The title compound （C12H15NO13S, Mr = 413.31） was synthesized by the nitration of napthalene-1,4-dicarboxylate acid in mixed nitric and sulfuric acids. It crystallizes in monoclinic, space group P2 1/c with a = 8.100（1）, b = 24.369（3）, c = 8.634（1） A, β = 105.380（2）°, V = 1643.1（4） A^3, Z = 4, Dc = 1.671 g/cm^3, F（000） = 856, μ（MoKa） = 0.273 mm^- 1, T = 294（2） K, the final R = 0.0400 and wR = 0.1021 for 2866 observed reflections with I 〉 2σ（I）. In this crystal there exist a number of H-bonds which link the molecules to form a three-dimensional infinite network structure. The thermal decomposition of the title compound was investigated by using TG-DTG and DSC techniques.

Synthesis,Structure and Photoluminescence of a New Pb(Ⅱ)Coordination Polymer[Pb(1,4-chdc)(L)]n·nH2O Based on a Flexible 1,4-Cyclohexanedicarboxylic Acid

A new Pb（Ⅱ） coordination polymer, [Pb（1,4-chdc）（L）]_n·nH_2O（1）, was synthesized under hydrothermal condition（1,4-H2 chdc = 1,4-cyclohexanedicarboxylic acid and L = 2-（3-fluorophenyl）-1H-imidazo[4,5-f][1,10]phenanthroline）. Its crystal structure was determined by singlecrystal X-ray diffraction. Compound 1 crystallizes in triclinic, space group P1 with a = 9.1182（8）, b = 11.3249（10）, c = 12.7326（12） A, α = 77.897（2）, β = 81.644（2）, γ = 84.491（2）°, V = 1269.0（2） A^3, Z = 2, C_（27）H_（24）FN_4O_5Pb, M_r = 710.69, D_c = 1.860 g/cm^3, F（000） = 690, μ（MoKa） = 6.701 mm^（-1）, R = 0.0349 and wR = 0.0746. In 1, each 1,4-chdc anion bridges two neighboring Pb（Ⅱ） atoms in a bidentate chelating coordination mode to give a chain structure. The L ligands are attached on one side of the chain through chelating the Pb（Ⅱ） atoms, and are stacked with those of an adjacent chain through π-π interactions, yielding a layer structure. The O-H···O and N-H···O hydrogen bonding interactions further stabilize the supramolecular layer structure of 1. Moreover, solid state luminescent property of 1 was also studied.

Synthesis and Crystal Structure of a Novel 2D Cadmium(II) Complex Constructed from N-(3-Carboxyphenyl)-4,4ˊ-bipyridinium and Benzene-1,4-dicarboxylic Acid

A novel redox-active bipyridinium ligand N-（3-carboxyphenyl）-4,4＇-bipyridinium chloride （HCPBPyC1） and its coordination polymer {[Cd2（CPBPy）2（BDC）（H2O）2Cl2]·6H2O}n 1 （H2BDC = benzene-1,4-dicarboxylic acid） were synthesized and characterized. Crystallographic data for 1： C42H44Cd2Cl2N4O16, Mr = 1156.51, monoclinic, space group C2/c, a = 21.046（3）, b = 11.0036（15）, c = 20.012（3）A, β = 98.694（8）°, Z = 4, V = 4581.1（11）A3, Dc = 1.677 g/cm^3, F（000） = 2280 and μ = 1.120 mm^-1. Complex 1 possesses a thick and undulated two-dimensional layer with （6,3） topology, which interpenetrates with two others （above and below） to extend into a three-dimensional supramolecular framework.

Synthesis and Crystal Structure of Tetraethyl syn-1,5,8,8bβ-Tetrahydrocyclobuta[1,2-b:3,4-b']dipydine-3,4aβ,7,8aβ(4H,4bβH)-tetracarboxylate

The synthesis of syn-photodimer from 1,4-dihydropyridine without 4-aryl was studied, and its single crystal was obtained （C22H30N2O8, Mr= 450.48）. It crystallizes in monoclinic, space group P21/c with a = 11.937（2）, b = 20.913（4）, c = 9.763（2） A,β = 108.46（3）°, V= 2311.9（8） ,A^3, Z= 4, Dc = 1.294 g/cm^3,/7（000） = 960,μ = 0.099 mm^- 1, R = 0.0640 and wR = 0.1464 for 4077 unique reflections with 1598 observed ones （I 〉 2σ（I）. It is shown that the whole molecular structure of the title compound is a twist-boat conformation, and the two double bonds have a trend of potential intramolecular reaction under high-energy irradiation.

Crystal Structure and Bovine Serum Albumin Binding Studies of Methyl 4-(2,4-Dichlorophenyl)-2,7,7-trimethyl-5-oxo-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate

The title compound, methyl 4-(2,4-dichlorophenyl)-2,7,7-trimethyl-5-oxo-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate(C_(20) H_(21)Cl_2NO_3, 1) was synthesized and the crystal structure was —determined by single-crystal X-ray diffraction. It crystallizes in tetragonal system, space group P421 c with a = 16.076(3), b = 16.076(3), c = 14.750(2) ?, V = 3811.8(14) ?3, Z = 8, R = 0.0377 and wR = 0.0845. The interactions between compound 1 and bovine serum albumin(BSA) were investigated using fluorescence spectroscopy. The results revealed that compound 1 can effectively quench the intrinsic fluorescence of BSA by static quenching mechanism. The thermodynamic parameters revealed that the action forces between compound 1 and BSA were mainly van der Waals forces and hydrogen bonds. According to F?rster's non-radioactive energy transfer theory, the binding distance between compound 1 and BSA had been determined. Furthermore, the synchronous fluorescence showed that compound 1 has few effects on the microenvironment and conformation of BSA in the binding process.

Synthesis,Structure and Antimicrobial Activity of 2'-Thioxo-2',3'-dihydro-1'H,2H-spiro[naphtho[2,1-b]furan-1,5'-pyrimido-[4,5-b]quinoline]-2,4'(10'H)-dione

A new 1,4-dihydroquinoline compound, 2＇-thioxo-2＇,3＇-dihydro-1＇H,2H-spiro [naphtho[2,1-b]furan-1,5＇-pyrimido[4,5-b]quinoline]-2,4＇（10＇H）-dione（C22H13N3O3S）, has been synthesized by the condensation of isatin, 2-thiobarbituric acid and 2-naphthol in aqueous medium. The compound was characterized by IR, NMR, H RMS and single-crystal X-ray diffraction. The crystal belongs to the triclinic system, space group P21/c with a = 9.5187（18）, b = 11.7706（19）, c = 12.0450（19） A, α = 89.201（5）, β = 81.550（6）, γ = 70.024（5）°, Mr = 399.41, V = 1253.6（4） A3, Z = 2, Dc = 1.058 g/cm3, F（000） = 412, μ = 0.151 mm-1, R = 0.0636 and w R = 0.1648. The preliminary antibacterial activity results show that the title compound exhibits antibacterial activity against Micrococcus tetragenus, Bacillus cereus, Bacillus subtilis, Staphylococcus aureus, S. albus and Escherichia coli.

Synthesis and Structure of a New Coordination Polymer Based on Indium and 1,4-Benzenedicarboxylate

A new coordination polymer {[In（bdc）（OH）]·4H2O}n（H2bdc=1,4-benzenedi-carboxylic acid） has been synthesized through hydrothermal conditions,and was characterized by X-ray single-crystal diffraction and other measurements.The complex crystallizes in the orthorhombic system,space group Imma with a=18.3621（13）,b=7.1932（5）,c=11.8278（8）,V=1562.24（19）3,Z=4.Dc=1.565g/cm3,Mr=368.00,F（000）=728,μ（MoKα）=1.542 mm–1,S=1.019,R=0.0468 and wR=0.1326 for 884 observed reflections（＆gt;2σ（Ⅰ））.The title compound represents a 3-Dframework containing four kinds of tunnels in different shapes and sizes.

Synthesis and Crystal Structure of a Novel Three-dimensional Complex Ni(Iz)_2(Bdc)(H_2O)_2 (Iz = Imidazole,Bdc = 1,4-Benzenedicarboxylate)

A novel nickel（Ⅱ） complex Ni（Iz）2（Bdc）（H2O）2 （Iz = imidazole, Bdc = 1,4-benzenedicarboxylate） has been synthesized and structurally characterized by X-ray analysis. The crystal is of monoclinic, space group P2 1/n with a = 5.5079（5）, b = 15.0973, c = 9.9825（9） A, β = 90.2380（10）°, C14H16N4NiO6, Mr = 395.02, Z = 2, V = 830.08（13） A^3 Dc = 1.580 g/cm^3, μ（MoKa） = 1.208 mm^-1, F（000） = 408, R = 0.0234 and wR = 0.0603 for 1379 observed reflections （I 〉 2σ（I））. In the title complex, adjacent nickel（Ⅱ） ions are bridged through the oxygen atoms of carboxylic groups in syn-anti conformation, yielding an infinite one-dimensional chain. These chains are linked to each other to form a 3-D network structure by three kinds of hydrogen-bonding interactions.

Synthesis and Crystal Structure of a Novel 3D Magnesium(II) Coordination Polymer Constructed by Flexible Benzene-1,4-dioxyacetate

A novel coordination polymer of [Mg(1,4-BDOA)(CH3OH)2]n (1,4-BDOA2– = benzene-1,4-dioxyacetate dianion) has been synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction. The crystal crystallizes in monoclinic system, space group P21/c, with a = 12.070(2), b = 7.7088(15), c = 7.3332(15) ?, β = 91.42(3)o, V = 682.1(2) ?3, Z = 2, Mr = 312.56, Dc = 1.522 g/cm3, μ = 0.168 mm–1, F(000) = 328, the final R = 0.0628 and wR = 0.1591 for 1082 observed reflections with I > 2σ(I). The Mg(II) atom and 1,4-BDOA2– ligand lie in different inversion centers. The Mg(II) atom shows an octahedral geometry defined by four carboxyl O atoms from four different 1,4-BDOA2– ligands and two hydroxyl O atoms from two methanol molecules. The Mg(II) atoms are bridged by 1,4-BDOA2– ligands, leading to a 3D infinite network structure.

Synthesis, Structure and Fluorescence Properties of a One-dimensional Zinc(Ⅱ) Complex Containing 1,4-Cyclohexanedicarboxylate

The new complex, {[Zn（L）（chdc）]＇2H2O}n （Hzchdc = 1,4-cyclohexanedicarboxylic acid, L = 1,3-bis（benzimidazol-l-yl-methylene）benzene）, was hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy, TGA and single-crystal X-ray diffraction analysis. The crystal belongs to the monoclinic system, space group C2/c with a = 14.5258（12）, b = 18.4438（15）, c = 21.1634（18） A, fl = 94.172（1）~, V = 5654.9（8） A3, Z = 8, C30H32NaO6Zn, Mr = 609.97, D,. = 1.433 g/cm3 and/~ = 0.919 mm-1. The zinc atom is six-coordinated by two N and four O atoms, forming a distorted octahedral geometry in the complex. The complex has an infinite one-dimensional （1D） loop-like chain structure which is extended into a two-dimensional （2D） supramolecular network structure via two kinds of ;π-πstacking interactions. The solid state fluorescence properties of the complex were investigated.