Relationship between Coordination Structure and Biological Activity of Copper(II) Nicotinate

1 INTRODUCTION In 1945, Braude[1] found for the first time that adding copper (Cu) ten times the normal requisite amount into the feed can improve the production property of the animal obviously. Therefore, from then on copper has been widely applied in pig- breeding industry as an effective growth-promoting agent, especially in the process of intensive culture, which plays an important part in improving the growth of animal and the production property. However, at the same time, the high…     

Thermochromic and Magnetic Properties of a Copper(Ⅱ) Coordination Compound

Copper complexes that can experience reversible heat-induced dehydration and rehydration in the solid state were rarely reported although thermochromic copper complexes have been widely reported, and their heat-induced magnetic properties have not been studied. We firstly observed the reversible thermochromic phenomena of the known copper(II) complex [Cu(bpy)(OOCCH_3)_2]n·xn H_2O(x = 2.5 or 3; bpy = 4,4?-bipyridine) in the solid state, which is associated with the dehydration and rehydration processes, and found that heat-induced coloration clearly enhanced the magnetic susceptibility.     

Synthesis and Catalytic Activity of Copper(Ⅱ) Resorcylic Acid Nanoparticles

Copper(Ⅱ) resorcylic acid(CuRes) nanoparticles were synthesized by using reactive precipitation method with resorcylic acid and blue copperas as the raw material in a rotating packed bed. The sample obtained was characterized by using X-ray diffraction( XRD), transmission electron microscopy( TEM ), Fourier transform infrared spectroscopy (FTIR), thermo-gravimetric analyses (TG), and element analysis. In addition, the catalytic activity of CuRes nanoparticles on the thermal decomposition of nitrocellulose-nitroglycerine (NC-NG) was also determined via DSC.The results show that the spherical nanoparticles with a diameter of 20 nm were obtained in ethanol solution. The peak temperature of the thermal decomposition of NC-NG-CuRes decreases by 3 ℃ compared with that of normal CuRes,and the decomposition enthalpy is increased by 735 J/g, and therefore, it is reasonable to assume that CuRes nanoparticles have a better catalytic activity.     

Studies on the Relationship between the Helical Structure and Optical Activity of Some Chiral Cyclic Esters Ⅱ

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Synthesis and Crystal Structure of Copper(Ⅱ)Complex with N-Acetoxyl-picolinamide

Using Cu(Ⅱ) as the template, a complex {[Cu2L2(H2O)2] 4H2O}n (L = N-acetoxyl- picolinamide) has been successfully synthesized and characterized by single-crystal X-ray diffrac tion. The crystal is of monoclinic, space group C2/c, with a = 24.144(5), b = 7.1622(14), c = 17.283(4) (A), C16H24Cu2N4O12, Mr = 591.47, β = 131.73(3)°, V = 2230.3(8) (A)3, Z = 4, Dc= 1.761 g/cm3, F(000) = 1208,μ = 1.978 mm-1, R = 0.0400 and wR = 0.1099. The copper (Ⅱ) ion is five coordinated with a distorted square pyramidal geometry. The complex can be viewed as a one dimensional chain structure by carboxylic bridges among copper atoms. In the complex there exist hydrogen bonding interactions to stabilize the structure.     

Synthesis and Crystal Structure of Cobalt(Ⅱ) and Copper(Ⅱ) Complexes Involving L-Aamino Alcohols

Two novel L-amino alcohol coordination cobalt and copper complexes I and Ⅱ were obtained separately from the direct reaction of L-plenylglycinol with Co(Ⅱ) acetate tetrahydrate in anhydrous ethanol and L-leucinol with Cu(Ⅱ) chloride dihydrate in anhydrous methanol. The structures of I and Ⅱ were determined by single-crystal X-ray diffraction and further characterized by elemental analysis and IR. For I: [Co3(C51H66N3O16)]2(OAc), monoclinic, space group P21, a = 15.022(3), b = 14.242(3), c = 28.922(6) , β = 98.944(4)o, V = 6112(2) 3, Z = 4, Dc = 1.339 g/cm3, the final R = 0.0860 for 21906 observed reflections with I 2(I). For Ⅱ: Cu2[C24H58N4O7Cl]Cl, orthorhombic, space group P212121, a = 6.1861(13), b = 20.838(4), c = 28.274(6) , V = 3644.6(13) 3, Z = 4, Dc = 1.310 g/cm3, the final R = 0.0642 for 11106 observed reflections with I 2(I). The complexes were then used to catalyze the Henry reaction and catalytic activity determined by 1H NMR.     

Crystal Structure,Electrochemical and Fluorescent Properties of a New Copper(Ⅱ) Coordination Polymer with 2,3-Pyridinedi-carboxylic Acid

A new copper(Ⅱ) coordination polymer [Cu_5(Hpt)_5(H_2O)_2(2,3-PCA)2]n·12 nH_2O(1) has been successfully synthesized under hydrothermal conditions with copper hydroxide, 3-(pyridin-2-yl)-1,2,4-triazole(Hpt) and 2,3-pyridinedi-carboxylic acid(2,3-PCA). The structure of the title compound was determined by X-ray diffraction analyses, elemental analyses and IR spectrum. The architecture of 1 consists of one-dimensional sandwich-like chains which are connected by extensive hydrogen bonding interactions. The solid-state photoluminescence displays an obvious emission band at 384 nm upon excitation at 340 nm. In addition, electrochemistry property has also been studied.     

Synthesis and Crystal Structure of Binuclear Complex of Copper(Ⅱ)Chloroacetate with Acetamine

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Synthesis,Crystal Structure and Antitumor Activity of a Ca(Ⅱ) Coordination Polymer Based on 4-Acetylphenoxyacetate Ligands

A novel Ca(Ⅱ) coordination polymer,[Ca L₂(H₂O)₂]_n (1,HL=4-acetylphenoxyacetic acid) has been synthesized with 4-acetylphenoxyacetic acid,Ca(ClO_4)₂·4H₂O and Na OH as raw materials.Complex 1 was characterized by elemental analysis and single-crystal X-ray diffraction analysis.The results show that the Ca(Ⅱ)ion is eight-coordinated in a distorted triangular dodecahedral geometric configuration with six carboxylate Oatoms of four L ligands and two O atoms of two coordinated water molecules.Complex 1 forms a one-dimensional chained structure by the bridging effect of carboxylate O atoms.The antitumor activity of HLligand and complex 1 has also been investigated.     

Structure and Magnetic Properties of a Bipyridine-bridged One-dimensional Ni(Ⅱ) Coordination Polymer

A polymer, [NiL(bipy)·2H2O]n(1, bipy = 4,4ˊ-bipyridine), has been acquired by the reaction of Ni(OAc)2·4H2O with N,Nˊ-bis(2-hydroxyl-5-fluorobenzyl)-2-hydrxylpropane dii- mine in the presence of 4,4ˊ-bipyridine. X-ray crystallographic analysis shows that it is comprised of a mononuclear Ni(Ⅱ) complex [NiL] linked by 4,4ˊ-bipyridine. Its crystal crystallizes in the orthorhombic system, space group C2/c with a = 22.595(3), b = 18.395(2), c = 15.434(2) , V = 6155(1)3, Dc = 1.259 g/cm-3, Z = 8, Mr = 583.23, F(000) = 2416.0, μ(MoKa) = 0.681 mm-1, S = 1.049, R = 0.0512 and wR = 0.1108 for 6032 observed reflections(I 2σ(I)). There are water hexamers in the complex. A weak overall ferromagnetic behavior has been evaluated by Curie-Weiss rule and by the formula of alternating ferro-ferromagnetic coupling in one-dimensional Ni(Ⅱ) chain, which gives g = 2.005(1) and J1 = 0.31(3) cm-1.     

Synthesis and Crystal Structure of Copper(Ⅱ) Compound with Didentate Schiff-base Ligand

The title complex [Cu(L)2] (HL=4-salicylideneamino-3,5-dimethanol-1,2,4-triazole) was synthesized by the reaction of Cu(CH3COO)2·2H2O with 4-salicylideneamino-3,5-dimethanol- 1,2,4-triazole in the methanol. The single-crystal X-ray study reveals that the compound crystallizes in monoclinic, space group P21/n with a = 11.746(5), b = 8.145(3), c = 12.786(5)A,β = 106.64(1)°, V = 1172(1)A3, Z = 2, Dc = 1.581 g/cm3, μ= 0.989 mm-1, F(000) = 574, C22H22Cu- N8O6, Mr = 558.02, T = 293(2) K, R = 0.0394 and Rw = 0.0835 for 2376 observed reflections with I > 2σ(I). The complex comprises a four-coordinated copper(Ⅱ) center, with an N2O2 planar coordi- nation environment. The molecules are connected by hydrogen bonds to form one-dimensional chains which are further linked to form a two-dimensional plane.     

Synthesis and Crystal Structure of a New 2D O-bridged Copper(Ⅱ) Coordination Polymer Constructed from Sulfonate-derived Schiff Base

A new chain-like coordination polymer, namely, [CuL ]n(1, Na2 L = 2-[(2-hydroxybenzylidene)-amino]-benzenesulfonic acid sodium salt), has been synthesized and characterized by single-crystal X-ray diffraction, IR spectroscopy and elemental analysis. Complex 1 crystallizes in monoclinic system, space group P21/c with a = 9.2296(16), b = 10.4754(18), c = 12.200(2) A, β =102.392(2)°, V = 1152.0(3) A3, C13H9 CuN O4S, Mr = 338.83, Dc = 1.953 g/cm3, Z = 4, F(000) = 684,μ = 2.089 mm-1, the final R = 0.0376 and w R = 0.0956. X-ray diffraction analyses indicate that 1displays a square-pyramidal metal center with NO4 donor sets. The sulfonate-derived Schiff base serves as a common N,O,O′-tridentate and a unique O-bridged ligand connecting the metals.Dinuclear copper complexes serve as secondary building blocks(SBUs) to construct an unusual2 D coordination network. In the crystal, the components form a stable 3D supramolecular architecture by C–H···O interactions and π-stacking.     

Synthesis and Crystal Structure of Copper(Ⅱ) Compound with Didentate Schiff-base Ligand

1INTRODUCTIONTransitionmetalcomplexesofSchiff-baseligandswhichbindtwoormoremetalcentersincloseproximityareimportantaspotentialcatalysts[1]andasmodelsforanumberofmetalloproteins[2]duetotheopportunitytheyprovidefortheinvesti-gationofmagneticinteractions.The…     

Synthesis,Crystal Structure,Thermal Stability and Solid UV-Vis Absorption Spectra of One New Copper(Ⅱ) Coordination Polymer

A new coordination polymer [Cu2(OH)(nbta)(tib)(H2 O)2]n(1, H3 nbta = 5-nitro-1,2,3-benzenetricarboxylic acid, tib = 1-(4 H-1,2,4-triazol-4-yl)-4-(imidazol-1-yl)benzene) constructed from dimeric Cu(Ⅱ) units has been synthesized under hydrothermal conditions and structurally characterized by single-crystal X-ray diffraction analysis. The compound crystallizes in monoclinic system, space group I2/c, with a = 17.8474(9), b = 11.7588(6), c = 21.9221(11) ?, β = 104.419(5)°, V = 4455.7(4) ?3 and Z = 8. Compound 1 is a three-dimensional structure constructed from dimeric Cu(Ⅱ) units and presents a 2-nodal(3,5)-connected net. Moreover, the thermal stability and solid UV-Vis absorption spectra have been investigated.     

A One-dimensional Coordination Polymer of Copper(Ⅱ) and Bis(4,6-dimethyl-2-pyrimidinethiolato)methane

Reaction of bis(4,6-dimethyl-2-pyrimidinethiolato)methane(bpytm) with CuCl2·4H2O in a mixed methanol/dichloromethane solution gave a one-dimensional coordina-tion polymer [CuCl2(μ-bpytm)]n which was characterized by single-crystal X-ray diffraction.It crystallizes in monoclinic,space group P21/c with a=16.9433(5),b=13.6986(4),c=7.8434(2),β=100.371(2)°,V=1790.71(9)3,Z=4,Mr=426.86,Dc=1.583 g/cm3,μ(MoKα)=1.751mm-1,F(000)=868,S=1.025,the final R=0.0399 and wR=0.0924 for 2538 observed reflections with Ⅰ2σ(Ⅰ) and 206 variables.The neutral coordination polymer is constructed by the bidentate thioether ligands to link adjacent copper atoms.Each copper atom is bridged by two adjacent nitrogen atoms of bpytm ligands and terminally bonded by two chloride atoms to form a squareplanar coordination geometry.The average Cu-N and Cu-Cl bond lengths are 2.025(2) and 2.234(1),respectively.     

Relationship between Structure and SHG Effect of Substituted Thienyl Chalcone

1INTRODUCTIONRecentlyorganicnonlinearoptical(NLO)materialsarebeingdevelopedforfre-quencyconversionoflaserinopto-electrics-Especiallybluelightisrequiredforopti-calmemoryofhighdensityrecording.Becauseadiodelaserisusedasalightsource,thenonlinearmaterialswhichhaveextremelyhighvalueofNLOcoefficientsandthetransmissionofblueregionarenecessary.Sincethesecond-orderNLOpropertyoforganiccompoundisderivedfromconjugateddelocalizedrrelectrons,thecompoundswhichhavebeenreportedhavefocusedonthenitroanil…     

Synthesis and Crystal Structure of a New(6,3)-Connected Ni(Ⅱ) Coordination Polymer

The coordination polymer [Ni(dpa)(bpp)]n(H2dpa = 2,4'-biphenyl-dicarboxylic acid,bpp = 1,3-di(4-pyridyl)propane) was hydrothermally prepared and characterized by single-crystal X-ray diffraction,FTIR spectra,elemental analysis and thermal analysis.The crystal is of triclinic system,space group P1 with a = 12.516(5),b = 12.943(5),c = 15.130(5) ,α = 94.331(5),β = 91.827(5),γ = 108.382(5)°,C54H44N4Ni2O8,Mr = 497.18,V = 2315.3(15) 3,Dc = 1.426 g/cm3,F(000) = 1032,μ = 0.875 cm-1,Z = 2,the final R = 0.0496 and wR = 0.1100 for 5365 reflections with Ⅰ 2σ(Ⅰ).X-ray diffraction analysis reveals that the carboxylate group of 2,4'-diphenic acids acting as bridging ligands adopts two coordination modes:bis-mondentate and bidentate chelating.The compound exhibits a two-dimensional(6,3)-connected architecture.     

Crystal Structure and Properties of a Copper(Ⅱ) Complex Containing p-Toluenesulfonate and Imidazole Ligands

A novel supramolecular mixed ligand complex of formula [Cu(PTS)2(Him)2(H2O)2] (C20H26CuN4O8S2,PTS=p-toluenesulfonate,Him=imidazole) has been synthesized in aqueous solution and characterized by elemental analysis,IR and single-crystal X-ray diffraction.The compound crystallizes in the monoclinic system,space group P21/n,Z=2,a=5.650(2),b=14.671(3),c=14.638(3),β=100.10(3)°,V=1194.60(4)3,Dc=1.607 g/cm3,μ(MoKα)=1.143 mm-1,F(000)=598,R=0.0615 and wR=0.1503 for 1752 observed reflections with I 2σ(I).The copper(II) ion in the complex adopts a slightly distorted octahedral coordination geometry and is six-coordinated with N2O4 donor set consisting of two nitrogen atoms and four oxygen atoms provided by the ligands of two imidazole molecules,two water molecules and two p-toluenesulfonate ions.The sulfonate group of the PTS ligand remains weak-coordinated and forms a number of hydrogen bonds with water molecules and imidazole ligands.X-ray structural analysis reveals that the coordination molecules are connected to form a 3-D supramolecular framework by electrostatic interaction,weak van der Waals forces,hydrogen bonding and π-π interaction.The thermal behaviour of the title complex was investigated by using DSC and TG-DTG techniques.