Synthesis and Crystal Structures of the α and β Forms of Bis(salicylaldoxime)copper(Ⅱ) Complexes

Modified α and β bis(salicylaldoxime)copper(Ⅱ) have been obtained by recrystallization from ethyl acetate(CCDC Nos. 212157 & 212158). The X-ray analysis reveals that the two modificated forms have the same structure with different geometric parameters. The α form crystallizes in the P2(1)/c space group and the β form in the P1 space group. Both the crystal structures consist of centrosymmetric monomeric molecules of Cu(OC6H4CNOH)2. The IR spectra are in agreement with the structural data.     

Synthesis and Magnetism of 2-Hydroxy-1,3-propylene-bis(oxamato)-bridged Co~ⅡCu~ⅡCo~Ⅱ Complexes

ＳｙｎｔｈｅｓｉｓａｎｄＭａｇｎｅｔｉｓｍｏｆ２┐Ｈｙｄｒｏｘｙ┐１，３┐ｐｒｏｐｙｌｅｎｅ┐ｂｉｓ（ｏｘａｍａｔｏ）┐ｂｒｉｄｇｅｄＣｏⅡＣｕⅡＣｏⅡＣｏｍｐｌｅｘｅｓＭＩＡＯＭｉｎｇ－ｍｉｎｇ，ＣＨＥＮＧＰｅｎｇ，ＬＩＡＯＤａｉ－ｚｈｅｎｇＪＩＡ...     

Synthesis and properties of the copper(Ⅱ) complexes with stable radical

Four novel copper(Ⅱ) complexes have been synthesized,namely Cu(hfac)2NITPhNO2 (1),Cu(hfac)2NITPhCH3 (2),Cu(pfpr)2NITPhNO2,(3) and Cu(Pfpr)2NITPhCH3 (4),where hfac= hexafluoro-acetylacetonate,pfpr=pentafluoropropionate,NITR.=2-R-4,4,5,5-tetraniethyl-4,5-dihydro-1H-imidazolyl-1-oxyl-3-oxide.(R=4-nitrophenyl,4-methylphenyl).These complexes were rharicter-ized by elemental analyses,IR,electronic spectra and molar conductance.The temperature-dependent magnetic susceptibility of complexes 1 and 3 have been studied in the 4 300 K range,giving I he exchange integral J=10.56 cm-1 for complex 1 and J =-30.9 cm-1 for complex 3.     

DNA Cleavage by Copper (Ⅱ) Complexes Without added Coreactants

Thedevelopmentofreagentswhichhydrolyticallycleave11ucleicacids"lidermildconditionsiscurrentlyattractinggreatinterestillthetieldofartiticialnucleases'-'.Whilemall}lreagentshavebeedsuccessfullyapplied.toDNAhydrolysis;.illershavebeenit-c'l'ersuccesseswithDNA'duetoitsrelativel}'highh}idrolyticstabilit}"(thepseudo-firsl-orderrateconstantt'Orthenollenzymatichydrolysisofphospllodiestersisextropolatedtobe2x10-"'h-=at24tandPH7.4').Theexceptionalstabilit}fofphosphodiestershasbeensuggestedasonereason…     

Synthesis and Crystal Structure of Tetrakis(1-vinylimidazole-kN3)diisothiocyanatomanganese(Ⅱ)

The title compound I(C22H24MnN10S2,Mr=547.57)has been synthesized and structurally characterized by single-crystal X-ray diffraction.The compound crystallizes in the monoclinic system,space group P21/c with a=8.6010(17),b=9.0180(18),c=17.773(4)(A),β=101.79(3)°,V=1349.5(5)(A)3,Z=2,Dc=1.348 g/cm3,μ=0.674mm-1,F(000)=566,the final R=0.0488 and wR=0.1289.In the structure,each Mn atom is coordinated by four Vim(Vim=1-vinylimidazole)ligands and a pair of monodentate isothiocyanic groups,affording a compressed octahedral MnN6 core.     

Synthesis and Magnetic Properties of Copper (Ⅱ) Complexes with Pyridine N-Oxide-2-ylmethy-lidenedithiocarbazate as Ligands

A series of copper (Ⅱ) complexes with pyridine N- oxide- 2- ylmethylidened-ithiocarbazates as ligands were synthesized and characterized by IR spectra, electronic spectra and magnetic moments measurement at room temperature. Variable temperature magnetic susceptibilites (3-300K) of four complexs were measured and fitted with the Bleaney-Bowers dimer equation by considering the magnetic interaction between molecules. The fitting results show the existence of intramolecular ferromagnetic interactions and intermolecu-lar anti-ferromagnetic interactions in these copper( Ⅱ) complexes.     

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.     

Synthesis and Properties of Three Tris(1,10-phenanthroline) ruthenium (Ⅱ) Derivatives

MThekeymaterials,5-amino-l,10-phenanthrolineandetS-Ru(phew,CI,,werepreparedbythemethodsofreferences"'.Synthesisofla,foandicEquimolaramountsofcorrespondingto-bromo-alkyIacyIohIondewasaddeddropwisetoasuspensionof5-amino-l,10-phenanthrolineandsodiumdicarbonateindryacetonitrilewithstirringatroomtemperatureundernitrogenfor4-6hours.Thentheresultingsolidwasfilteredandwashedbyacetonitrile,5%sodiumbicarbonateaqueoussolutionandwaterinturn.Afterbeingdriedicvacuo,yellowmicrocrystalsla-cwereobtained.Sy…     

Synthesis,characterization and magnetism of copper(Ⅱ)-lan-thanide(Ⅲ) heterobimetalic complexes with N,N'-oxamidobis-(benzoato) cuprate (Ⅱ)

Seven new μ-oxamido copper(Ⅱ)-lanthanide(Ⅲ)hetero-bitnetalic complexes described by the fonnula Cu(obbz)Ln-(Ph-phen)2NO3(Ln=La,Nd,Eu,Gd,Tb,Ho,Er),where obbz denotes the oxamidobis(benzoato)and Ph-phen represents 5-phenyl-1,10-phenanthroline,have been synthesized and characterized by the elemental analyses,spectro-scopic(IR,UV,ESR)studies,magnetic moments(at room temperature)and molar conductivity measurement.The temperature dependence of the magnetic susceptibility of Cu(obbz)Gd(Ph-phen)2NO3 complex has been measured over the range 4.2-300 K.The least-squares fit of the experimental susceptibilities based on the spin Hamiltonian operator,H=-2JS1 S2,yielded J= 1.28 cm-1,a weak ferromagnetic coupling.A plausible mechanism for a ferromagnetic coupling between Gd(Ⅲ)-Cu(Ⅱ)is discussed in terms of spin-polarization.     

Synthesis,Characterization,and DNA Binding Properties of Dinuclear Copper(Ⅱ)Complex [Cu2(TATP)2(L-Leu)2(CIO4)2]2°2H2O

A dinuclear copper(Ⅱ) complex [Cu2(TATP)2(L-Leu)2(ClO4)2]2.2H2O was synthesized and characterized,where,TATP=1,4,8,9-tetraazatriphenylene,and L-Leu=L-leucinate,The complex was crystallized in the triclinic space group P1,with two independent molecules in a unit cell,Two Cu(Ⅱ) ions in each complex[Cu2(TATP)2(L-Leu)2(ClO4)2]molecule were found to be in different coordination geometries,i.e.,Cu2 or Cu4 of a distorted square-pyramidal geometry coordinated with two nitrogens of TATP,the amino nitrogen and one carboxylate oxygen of L-Leu and one oxygen of perchlorate,and Cul or Cu3 with an octahedral geometry coordinated with the above stated similar coordinated atoms,and another carboxylate oxygen of L-Leu coordinating to Cu2 or Cu4,The complex can interact with CT-DNA by an intercalative mode and cleave pBR322 DNA in the presence of ascorbate.     

Syntheses and Crystal Structures of Two New Zinc(Ⅱ)Nitroxide Radical Complexes Bridged by Isophthalate

Two novel complexes [Zn(NIT3-py)(ip)]n 1 and [Zn(im3-py)(ip)]n 2 (NIT3-py =2-(3"-pyridyl)-4,4,5,5,-tetramethylimidazoline-1-oxyl-3-oxide, im3-py = 2-(3'-pyridyl)-4,4,5,5-te-tramethylimidazoline-1-oxyl, ip = isophthalate) have been synthesized and structurally determinedby X-ray diffraction.Crystal data for 1: C32H36N6O8Zn, Mr= 698.04, monoclinic, space group C with a = 23.600(3), b = 10.2073(12), c = 13.4027(16)(A), β= 92.586(2)°, V = 3225.3(7) (A)3, Dc=1.438 g/cm3, F(000) = 1456,μ(MoKα) = 0.822 mm-1, Z = 4, the final R = 0.0390 and wR = 0.1032 for 6037 independent reflections with Rint=0.0214.Crystal data for 2: C32H36N6O6Zn, Mr = 666.04,monoclinic, space group C2/c with a = 24.434(4), b = 13.543(2), c = 10.2379(16)(A), β= 109.024(2)°,V= 3202.8(9)(A)3, Dc= 1.381 g/cm3, F(000) = 1392,μ(MoKα) = 0.820 mm-1, Z= 4,the final R = 0.0304 and wR = 0.0658 for 2833 independent reflections with Rint = 0.0307.X-ray analysis reveals that both Zn(Ⅱ) ions are four-coordinated by two pyridyl-N atoms from nitroxide radicals and two carboxylate oxygen atoms to form distorted tetrahedral geometries.Each iso-phthalate dianion binds two Zn(Ⅱ) ions in a monodentate mode, leading to a 1-D chain structure.     

Synthesis, Structure and Magnetic Properties of Novel Carboxylato-bridged Pentanuclear Copper(Ⅱ)-Lanthanoid(Ⅲ) Complexes

ＩｎｔｒｏｄｕｃｔｉｏｎＰｏｌｙｎｕｃｌｅａｒｍｉｘｅｄ－ｍｅｔａｌｃｏｍｐｌｅｘｅｓｃｏｎｔａｉｎｉｎｇｂｏｔｈｔｒａｎｓｉｔｉｏｎａｎｄｌａｎｔｈａｎｏｉｄｍｅｔａｌｉｏｎｓａｒｅｏｆｓｐｅｃｉａｌｃｕｒｅｎｔｉｎｔｅｒｅｓｔｉｎｒｅｌａｔｉｏｎ...     

Studies of copper (Ⅱ) complexes as catalysts for the hydrolysis of DNA

Hydrolysis of DNA is an important enzymatic reaction , but it is exceedingly difficult to mimic in the laboratory because of the stability of hydrolysis of DNA. In this paper, the cleavage activity of complexes formed between Cu(Ⅱ) and four different amino acid or amino acid methyl ester on DNA is studied by gel elec-trophoresis. It is found that DNA could be cleaved by Cu(Ⅱ)-L-His and Cu(Ⅱ)-L-His methyl ester complexes and the efficiency of cleavage is largely dependent on the metal ion-to-ligand ratio. Further experiments show that the cleavage of DNA mediated by Cu(Ⅱ)-L-His complexes occurs via a hydrolytic mechanism and the active chemical species that affects DNA cleavage is proposed to be MI2H and ML2H22 .     

Syntheses and Magnetism of μ-1, 3, 5-Benzenetricarboxylato Trinuclear Manganese(Ⅱ) and Nickel(Ⅱ)Complexes

IntroductionThestudyofmagneticexchangeinteractionbetweenparamagneticcenterspropagatedbymulti-atombridgesisofcurrentinterestduetounderstandingthepathwayofelectrontransferinbio1ogicalsystemandobtainingsomeusefulin-formationaboutdesigningmolecule-basedmagnets.Manypapers['-'Jdealingwithphthalato,isophthalatoandterephthalatoligandsasamulti-atombridgeshavebeenpublished.1thasbeenrevealedbythevariable-temperaturemagneticsusceptibilityinvestigationthatlong-rangemagneticcouplingoccursbetweentwoparamagne…     

Two Novel Copper(Ⅱ) Complexes with A Novel Ligand 2,4-Di(2-aminopyridine)-6-methylpyrimidine

Introduction The design and syntheses of multidentate N-donor ligands have become the focus of much inter-est in the chemical field[1-4]because these ligands can form multinuclear metalxompounds, coordina-tion polymers and supramolecular compounds,which play a very important role in the bilolgicalsystems, magnetic materials,electric materials,optical materials and otherfields[5-8].     

Trihydrated Complex of Tetrabenzimidazole Copper(Ⅱ) Sulfate

A Trihydrated complex of benzimidazole copper(Ⅱ) sulfate [(C7H6N2)4CuSO4]·3H2O was synthesized and structurally characterized. The crystal structure of this compound is built up of six solvated water molecules and two dissimilar copper ions identified as Cu1 and Cu2. The coordination geometry of copper(Ⅱ) is a slightly distorted square pyramid. The four equivalent tertiary nitrogen atoms of the benzimidazole ligand form an equatorial plane, while the oxygen atoms of sulfato occupy the axial site. In the solid state, the title compound forms a three dimensional network structure via hydrogen bonds. The benzimidazole, sulfato ion and H2O moieties are connected by the intermolecular hydrogen bonds. The (EPR) spectrum shows axial symmetry with g⊥=2.039 and g∥=2.285. Variable temperature magnetic susceptibility shows that there is a weak antiferromagnetic interaction between the neighboring copper(Ⅱ) ions.     

Synthesis and Conductivity of a One-dimensional Polymer of a Copper(Ⅱ)-porphyrazine with Sulfur Bridges

Phthalocyanines(Pcs)andtheirpolyinershavebeenasubjectofgreatinterestduetotheirhighthermalstabilityanduniquephotoelectricpropertiesl4.Ithasbeenfoundthatsomeelectronicfunctionsofthemetalthioporphyrazinesandtheirconjugatedpolymers,suchasgas-sensitivityphotosensitivity,photoconductivityandelectrocatalyticactivity,aremorepeculiarthancorrespondingPcs5'6.Oneofourinterestsistodesignanovelpolymerofmetalporphyrazines(PMPzs)withswitchingpointsunderthecontrolofachangingexternalfieIdorenvironment.Inthepr…     

含酚氧桥的新型Cu(Ⅱ)-Mn(Ⅱ)和Cu(Ⅱ)-Co(Ⅱ)配合物的合成和磁性

合成了3种新型配合物[Cu(samen)Mn(NO_(2-)Phen)_2](1)、[Cu(sampn)Mn(NO_(2-)Phen)_2](2)和[Cu(samen)CO(terp)](3)(samen~(4-)、sampn~(4-)、NO_(2-)Phen和terp分别表示N,N′-乙二水杨酰胺根阴离子、N,N′-1,2-丙二水杨酰胺根阴离子、5-硝基-1,10-菲绕啉和联三吡啶),测得配合物的变温磁化率,求出交换积分,J分别为-63cm~(-1)(1)、—65cm~(-1)(2)和—7.68cm~(-1)(3),表明金属离子间有反铁磁超交换作用。     

Synthesis and Magnetic Studies of Oxamido-Bridged Cu(Ⅱ)-Fe(Ⅱ) Heterobinuclear Complexes

~The~andmagneti~Of~~areatoPicthahasndchinndinndnd.bondinthewiin-wtofbinudearCU(n)-Fe(u)-,chewedwiththe~alleq-nettrioftwnew~-,[CU(oxa)Fe(L)21sa(Lbo1,1o-~(Phen)nd5-nithe1'1o-~(NQ-Phen)),whereOxaisN,N'-bis(2-amhathy).edfor.-Synboor(1)ToCh(oxae)2(94.2mp'o.4ed)theindri(5nd)wasbo-lyadtalaedboofso.Wio(111.2mp,o.4nuno)inmeto(1ond)ndaboofPhen(144-2mp,o.8mrnO)inrne~(1OrnL)underN2atrmpe.theedfor2hthegreddebm~thuSfo~wereforoff,washededtimeswithrne~anddiethyletheranddriedoverP2QUnderededpe.ha:C,…     

Synthesis and magnetic interaction of μ-2-chloroterephthalato binuclear iron (Ⅱ) complexes

Four μ-2-chloroterephthalato binuclear iron(Ⅱ) complexes, namely [Fe2 (CTPHA) L4]-(ClO4)2, where L stands for 4,4'-dimethyl-2,2'-bipyridine (Me2-bpy); 2,9-dimethyl-l, 10-phenanthro-line (Me2-phen); 5-chloro-l, 10-phenanthroline (Cl-phen); 4, 7-diphenyl-l, 10-phenanthroline (Ph2-phen), respectively, and CTPHA represents 2-chlorolerephthalate dianion, have been synthesized and characterized. Based on the elemental analyses, molar conductance measurements and spectroscopic studies, extended CTPHA-bridged structures consisting of two iron(Ⅱ) ions, each in a distorted octahedral environment, are proposed for these complexes. [Fe2 CTPHA)-(Me2-bpy)4] (ClO2 (1) and [Fe2(CT-PHA)·(Me2-phen)4](ClO4)2 (2) complexes were characterized by variable temperature magnetic susceptibility (4-300 K) measurements and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, H = - 2JS1 · S2 , giving the exchange integrals J = - 1.28 cm-1 for 1 and J = - 1.85 cm-1 for 2. These r