Complexation Properties and Synthesis of 1,2-Bis(2 ,2' -bipyridinyl)ethylene and 1,2-Bis(2,2' -bipyridinyl)ethane Ligands with Cu(I)

l,2-Bis(2,2'-bipyridinyl)ethylene(1) ligand was synthesized by Wittig-Horner reaction and 1, 2-Bis(2, 2'-bipyridinyl)ethane(2) ligand(which can be obtained via another route ) was prepared by hydrogenation of (1). The formation of complexes of (1) and (2) with copper (I) has been studied. The influence of the different bridge chains (CH =CH, CH2CH2) on complexation is discussed on the basis of 1H NMR spectra. Keywords Dipyridine aldehyde, Dipyridine derivative, Copper complex

Synthesis and Crystal Structure of a Cadmium Coordination Polymer with Dicyanamide and 1,2-Bis(1,2,4-triazol-1-yl)ethane

The new cadmium（N） coordination polymer [Cd（bte）2（dca）2]n 1 （bte = 1,2-bis（1,2,4- triazol-1-yl）ethane, dca = dicyanamide） was synthesized and characterized by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/n with a = 8.7148（15）, b = 8.6142（17）, c = 15.204（3） A, fl= 92.100（10）°, V= 1140.6（4） A3, Z= 2, Mr = 572.87, Dc= 1.668 g/cm3, F（000） = 572, /t = 1.004 mm-l, the final R = 0.0654 and wR = 0.1429 for 1737 observed reflections （I 〉 2σ（I））. The cadmium atom is coordinated equatorially by four nitrogen atoms from four bte ligands and axially by two nitrogen atoms from two dca anions to adopt a distorted octahedral geometry. Each bte molecule bridges two cadmium（II） atoms. Two strands of bte molecules are wrapped around each other, and held together by cadmium（H） atoms. 1 Forms a double chain structure containing eighteen-membered Cd2（bte）2 rings.

Syntheses,Structures and Luminescent Properties of Cd(Ⅱ)/Zn(Ⅱ) Coordination Polymers Based on the Flexible 4-Substituted Bis(1,2,4-triazole) Ligand

Two new cadmium（II） and zinc（II） coordination polymers, {[Cd（btre）0.5- （mip）（H2O）2]·H2O}n （1） and [Zn（btre）（mip）]n （2）, were synthesized at room temperature condition and characterized by IR spectra, elemental analyses, single-crystal and powder X-ray diffractions （btre = 1,2-bis（1,2,4-triazol-4-yl）ethane, H2mip = 5-methyl-1,3-benzenedicarboxylic acid）. Complex 1 belongs to the triclinic system, P space group, with a = 8.9830（6）, b = 10.0579（6）, c = 10.2479（9） , α = 98.837（6）, β = 115.975（8）, γ = 106.370（6）°, V = 756.30（11） 3 and Z = 2; complex 2 crystallizes in monoclinic, space group P21/c, with a = 7.0332（3）, b = 14.9947（7）, c = 15.9689（7） ？, β = 97.1170（10）°, V = 1671.12（13） ？3 and Z = 4. Compounds 1 and 2 based on the same N/O-donor ligands show different structures. The one-dimensional chains of 1 are further linked by hydrogen bonding and π-π interactions to yield a three-dimensional supramolecular structure. The two-dimensional （6,3） networks of 2 are further extended into a 3D framework via π-π interactions. Thermal stabilities and luminescence of 1 and 2 were investigated.

One Dimensional Coordination Polymer Constructed by 1,2-Bis(4-pyridinecarboxamido)ethane and Copper(II)

The ligand [1, 2-bis(4-pyridinecarboxamido) ethane] (L) and the coordination polymer {[Cu(L)(2)(H2O)].(NO3)(2).6H(2)O}(n)(1) have been synthesized and characterized by IR and H-1 NMR, spectra. Their molecular structures and the packing of 1 have been determined by single-crystal X-ray diffraction analysis. The Cu(II) in 1 is bridged by two ligand forming an infinite one-dimensional chain like structure and L in I adopts a different conformation from its free state. 1 belongs to monoclinic, space group P2(1)/n, a = 1.2896(3) nm, b = 1.2552(8) nm, c = 2.2903(19) nm, beta = 93.04(5)degrees, Z = 4, V = 3.702(4) nm(3). The TG and DTG experiments showed that the uncoordinated H2O can be removed at low temperature by heating, and it does not decompose until 250 degreesC.

1,2-双膦乙撑化合物的合成研究

以叔膦为原料 ,经碱金属裂解后与 1,2 二氯乙烷反应合成 1,2 双膦乙撑化合物 .研究了叔膦化合物的裂解方式 ,碱金属膦化物的稳定性及对反应条件的影响 .

Syntheses, Crystal Structures, and Fluorescence Properties of Two 2D→2D Coordination Polymers Based on the Flexible 4-Substituted Bis(1,2,4-triazole) Ligand

Two new 2 D → 2 D zinc(II) coordination polymers, [Zn(btre)0.5(nbdc)(H2 O)]n(1) and {[Zn(btre)0.5(Me Oip)(H2 O)2]·H2 O}n(2)(btre = 1,2-bis(1,2,4-triazol-4-yl)ethane, nbdc=3-nitro-1, 2-benzenedicarboxylate, Me Oip=4-methoxybenzene-1, 3-dicarboxylate) were synthesized at room temperature condition and characterized by IR spectra, elemental analyses, single-crystal and powder X-ray diffractions. Three sets of equivalent 2 D(6, 3) networks parallel polycatenated with each other to give a 2 D → 2 D network in 1 and 2. There are strong π-π interactions and hydrogen bonding interactions between adjacent parallel polycatenated 2 D(6, 3) network in 1. Only hydrogen bonding interactions exist in 2. Thermal stabilities and luminescence of 1 and 2 were investigated.

Hydrothermal Syntheses,Crystal Structures and Characteristics of Two New Isostructural Ni(Ⅱ)Coordination Polymers

Two new isostructure nickel（Ⅱ） coordination polymers, [Ni2（5-Me-ip）（1,2- Bie）（H2O）2]n （1） and [Ni2（5-Br-ip）（1,2-Bie）（H2O）2]n （2） （5-Me-H2ip = 5-methylisophthalic acid, 5-Br-H2ip = 5-mromoisophthalic acid, 1,2-Bie = 1,2-bis（imidazole）ethane）, have been synthesized and structurally characterized by single-crystal X-ray diffraction. The result shows that complexes 1 and 2 crystallize in orthorhombic system, space group Pna21 with a = 16.3602（13）, b = 10.1465（8）, c = 21.8803（17）A^°, V = 3632.1（5） A^°3, Z = 4, Dc = 1.525 g/cm3, F（000） = 1728, R = 0.0292 and wR = 0.0668 for 6646 observed reflections （I 〉 2σ（I）） for complex 1 and a = 16.409（3）, b = 10.1625（17）, c = 21.918（4）A^°, V = 3654.9（11） A^°3, Z = 4, Dc = 1.752 g/cm^3, F（000） = 1936, R = 0.0309 and wR = 0.0600 for 6809 observed reflections （I 〉 2σ（I）） for complex 2. They both feature zigzag 2D layer structures, which are further staked along the a-axis through π…π and hydrogen interactions to form 3D supramolecular structures.

A Cu(Ⅱ) Coordination Polymer with 5-Tert-butyl Isophthalate Linker:Synthesis,Crystal Structure,and Magnetic Properties

A new Cu（Ⅱ） metal-organic coordination polymer, {[Cu2（tbip）2（bie）2]·H2O}n （1, H2tbip = 5-tert-butyl isophthalic acid, bie = 1,2-bis（imidazol-1 ＇-yl）ethane）, was assembled under hydrothermal conditions by the reactions of Cu（Ⅱ） acetate with H2tbip and bie. Complex 1 was characterized by elemental analysis, IR spectroscopy and X-ray single-crystal diffraction. Complex 1 crystallizes in triclinic, space group P1, with a = 9.9145（10）, b = 13.2211（13）, c = 15.4363（15） nm, a = 87.0250（10）, β = 88.3220（10）, γ = 83.8240（10）°, V= 2008.4（3） nm3, Z = 2, Dc = 1.505 Mg/m3, F（000） = 944, g = 1.125 mm^-1, S = 1.030, the final R = 0.0336 and wR = 0.0790. The results reveal that complex 1 is a two-dimensional layered structure. In addition, magnetic properties of I were also investigated.

Determination of Pb（Ⅱ） and Cu（Ⅱ） by Electrothermal Atomic Absorption Spectrometry after Preconcentration by a Schiff Base Adsorbed on Surfactant Coated Alumina

1,2-Bis（salicylidenamino）ethane loaded onto sodium dodecyl sulfate-coated alumina was used as a new chelating sorbent for the preconcentration of traces of Pb（Ⅱ） and Cu（Ⅱ） prior to atomic absorption spectrometric determination. The influence of pH, flow rates of sample and eluent solutions, and foreign ions on the recovery of Pb（Ⅱ） and Cu（Ⅱ） by this sorbent has been studied. The retained ions were eluted with 4 mol·L nitric acid and determined by electrothermal atomic absorption spectrometry （ETAAS）. The data of limit of detection （3σ） for Pb（Ⅱ） and Cu（Ⅱ） were found to be 8.57 and 2.69 ng·L^-1 respectively, while the enrichment factor for both ions was 100. The proposed method was successfully applied to determination of lead and copper in different water samples.