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1.
Summary N-benzamidosalicylaldimine (H2L) complexes of CuII, NiII, CoII, FeII, MnII. VOIV and TiOIV have been prepared. The ligand probably coordinates to the metal from the hydroxyl, carbonyl and imino groups.  相似文献   

2.
Summary Several new complexes of the title ligand (H2MPTS) with CoII, NiII, CuII, and CdII have been prepared. Structural assignments of the complexes have been made based on elemental analysis, molar conductivity, magnetic moment and spectral (i.r.,1H n.m.r., reflectance) studies. The compounds are non-conductors in dimethylsulphoxide. The neutral molecule is coordinated to the metal(II) sulphate as a bidentate ligandvia the two carbonyl groups. The ligand reacts with the metal(II) chlorides with the liberation of two hydrogen ions, behaving as a bianionic quadridentate (NONO) donor. Enolization is confirmed by the pH-titration of H2 MPTS and its metal(II) complexes against NaOH. A distorted octahedral structure is proposed for the CuII complex, while a square planar structure is suggested for both CoII and NiII complexes. The stoichiometry of the complexes formed in EtOH and buffer solutions, their apparent formation constants and the ranges for obedience to Beer's law are reported for CoII, NiII and CuII ions. The ligand pK values are calculated. The antimicrobial activity of H2 MPTS and its CoII, NiII, CuII and MnII complexes is demonstrated.  相似文献   

3.
A new ligand, N-phenyl-N -2-furanthiocarbohydrazide (HPhfth), and its complexes with VOIV, MnIII, FeIII, CoII, NiII, CuII and ZnII have been prepared and characterized by elemental analyses, magnetic susceptibility measurements, i.r., n.m.r., u.v.–vis., mass and FAB mass spectral data. The room temperature e.s.r. spectra of the VOIV, FeIII and CuII complexes yield <g> values characteristic of square pyramidal VOIV, octahedral FeIII and square planar CuII, respectively. The NiII and CuII complexes semiconduct, but the ZnII complex is an insulator at room temperature. However, the conductivity increases as the temperature increases from 303–383 K, with a band gap of 0.21–1.01 eV. HPhfth and its soluble complexes have been screened against several bacteria and fungi.  相似文献   

4.
Summary Complexes ofo-hydroxyacetophenone-2-furoylhydrazone, H2L, of the types M(H2L)C12 · nH2O [Mn = CoII, n=0; NiII, n=2]; Cu(HL)Cl, M(HL)2 [M = VIVO, CoII, NiII or CuII] and M(L)(H2O)n [M = CoII or NiII, n=2; M = CuII, n=0] have been prepared and characterized by elemental analyses, molar conductance, magnetic susceptibility, visible, e.s.r. and i.r. spectral studies. The different modes of ligand chelation and the stereochemistry around the metal ions are discussed.  相似文献   

5.
Summary The synthesis and characterization of MnII, CoII, NiII, CuII, ZnII, CdII UO 2 2+ , CrIII and FeIII complexes of biacetylmonoxime nicotinoyl hydrazone (H2BMNH) are reported. Elemental analysis, molar conductance, magnetic moment and spectral (i.r., visible and n.m.r.) measurements have been used to characterize the complexes. I.r. spectral data show that the ligand behaves in a bidentate and/or tridentate manner. An octahedral structure is proposed for the MnII, NiII, CrIII and FeIII complexes, while a square-planar structure is proposed for both CoII and CuII complexes on the basis of magnetic and spectral measurements.  相似文献   

6.
Mononuclear [M(hfacac)2(H2biim)] complexes, where M = MnII, FeII, CoII, NiII, CuII or ZnII, hfacac = hexafluoroacetylacetonate, H2biim = 2,2-biimidazole; dinuclear K2[M2(acac)4(-biim)] (M = CuII or ZnII) and tetranuclear K2[M4(acac)8( 4-biim)] (M = CoII or NiII) complexes have been prepared and characterized by chemical analysis, conductance measurements, i.r., electronic and e.p.r. spectroscopies and by magnetic susceptibility measurements (in the 2–300 K range). MnII, FeII and CoII are in a high spin state. The e.p.r. spectra of CuII and MnII compounds have been recorded.  相似文献   

7.
Complexes of CrIII, MnII, FeIII, CoII, NiII and CuII containing a macrocyclic pentadentate nitrogen–sulphur donor ligand have been prepared via reaction of a pentadentate ligand (N3S2) with transition metal ions. The N3S2 ligand was prepared by [1 + 1] condensation of 2,6-diacetylpyridine with 1,2-di(o-aminophenylthio(ethane. The structures of the complexes have been elucidated by elemental analyses, molar conductance, magnetic susceptibility measurements, i.r., electronic and e.p.r. spectral studies. The complexes are of the high spin type and are six-coordinate.  相似文献   

8.
A new potential tetradentate ligand, N-nicotinoyl-N-2-furanthiocarbohydrazide (H2Nfth), and its complexes with VOIV, MnII, FeII,III, CoII, NiII, CuII and ZnII have been prepared and characterized by elemental analyses, magnetic susceptibility measurements, u.v.–vis, i.r., n.m.r., ES+ and FAB mass spectral data. The room temperature e.s.r spectra of the VOIV and FeIII complexes yield g values, characteristic of octahedral complexes. The Mössbauer spectra of [Fe(HNfth)2] and [Fe2(Nfth)3] at room temperature and at 78 K suggest the presence of high-spin iron(II) and iron(III), respectively. The complexes are electrically insulating at room temperature, however, their conductivities increase as the temperature increases from 333–383 K, with a band gap of 0.46–0.77 eV, indicating their semiconducting behaviour. H2Nfth and its soluble complexes have been screened against several bacteria and fungi.  相似文献   

9.
Summary 2-Aminoacetophenone-2-thenoylhydrazone, Haath, C4H3SC(O)NHN=C(Me)C6H4NH2-o, forms complexes with metal(II) salts of empirical compositions [VO(Haath)2SO4], [M(Haath)2Cl2] [M=CoII, NiII, CuII or ZnII] and [M(aath)2] [M=VIVO, CoII, NiII, CuII or ZnII] which have been characterized by elemental analyses, molar conductance, magnetic susceptibility, electronic, e.s.r., i.r. and n.m.r. (1H and13C) spectral studies. X-ray and electron diffraction patterns have been obtained in order to elucidate the structure of the CuII complexes. Photoacoustic spectra of powder NiII complexes have been recorded and interpreted in the light of u.v./vis. spectra.  相似文献   

10.
Summary The synthesis and characterization of CrIII, MnII, FeIII, CoII, NiII, CuII, ZnII, CdII and UO inf2 sup2+ complexes of N-isonicotinamido-N-benzoylthiocarbamide (H2IBTC) are reported. I.r. spectral data show that the ligand behaves in a bidentate, tridentate and/or tetradentate manner. Different stereochemistries are proposed for CrIII, MnII, FeIII, CoII, NiII and CuII complexes on the basis of spectral and magnetic studies. The i.r. data indicate that the carbonyl oxygen of the benzoyl moiety is the backbone of chelation in most complexes.  相似文献   

11.
A novel tetradentate nitrogen donor [N4] macrocyclic ligand, i.e. 1,3,4,8,9,11-hexaaza-2,10-dithia-5,12-dioxo-7,14-diphenyl-cyclotetradecane (L), has been synthesized. Manganese(II),cobalt(II), nickel(II) and copper(II) complexes with this ligand have been prepared and subjected to elemental analyses, molar conductance measurements, magnetic susceptibility measurements, mass, 1H-n.m.r. (Ligand), i.r., electronic, and e.p.r. spectral studies. On the basis of molar conductance the complexes may be formulated as [M(L)X2] [where M = MnII, CoII, NiII, and CoII,and X = Cl & NO 3 ] due to their nonelectrolytic nature in dimethylformamide (DMF). All the complexes are of the high spin type and are six coordinated. On the basis of i.r., electronic and e.p.r. spectral studies an octahedral geometry has been assigned to MnII, and II, II, complexes, and tetragonal for copper(II) complexes. The antimicrobial activities of the ligand and its complexes, as growth inhibiting agents, have been screened in vitro against several species of bacteria and plant pathogenic fungi.  相似文献   

12.
A series of asymmetric heterobimetallic complexes of the type [LMLSn]Cl and [LMLSn]Cl2, where L = ethylene diamine, M = MnII, CoII, NiII and CuII, M = CrIII and FeIII and L = 1-tryptophan and 1-valine, have been synthesized and characterized by elemental analyses, u.v.–vis., i.r., e.p.r., n.m.r., cyclic voltammetry and conductivity measurements. The CoIII analogue of these complexes was characterized by two dimensional n.m.r. COSY data. The kinetics of oxygen binding with the complex [C15H23N4O2SnCo]Cl has also been studied. The kinetic data proves that CoII of a coordinated molecule participates in the rate-determining step of the dioxygen binding process. The plots of the pseudo-first-order rate k obs versus [O2] are linear passing through an intercept. The electrochemical behaviour of [C15H23N4O2SnCo]2+ and [C15H23N4O2SnCu]+ was monitored by cyclic voltammetry. Comparison of the electrochemical properties of [CoIIISnIV]2+ and [CuIISnIV]+ reveal that, in both the species, one electron transfer reaction takes place. For the [CoIIISnIV]2+ species E 0 = 0.272 and –1.1 V and for the [CuIISnIV]+ species E 0 = 0.078 and –0.300 V values were obtained, respectively.  相似文献   

13.
CrIII, MnII, CoII, NiII, CuII and PdII complexes of the macrocyclic ligand, 2,3,5,8,9,11 hexamethyl-1,4,7,10 tetraaza- cyclododeca-1,3,7,9 tetraene (DADAP), have been synthesized and characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, i.r., electronic and e.p.r. spectral studies. These spectral studies suggest an octahedral geometry for the CrIII, MnII and CoII, square planar geometry for NiII and PdII and tetragonal geometry for CuII complexes.  相似文献   

14.
Summary The synthesis and characterization of CrII, MnII, FeII, CoII, NiII, PdII, CuII, ZnII, CdII and UO 2 2+ complexes of 1-meotinoyl-4-phenyl-3-thiosemicarbazide (H2NTS) are reported. I.r. spectral data show that the ligand behaves in a bidentate and/or tetradentate manner. An octahedral structure is proposed for the CrII, FeII and NiII complexes; a tetrahedral structure for the MnII, CoII and Cu(NTS)·2H2O complexes; and a square planar structure for the PdII and Cu(HNTS)Cl·H2O complexes. The i.r. data suggest that the FeII complex contains a hydroxo bridge.  相似文献   

15.
Summary The preparation and characterization oftris-complexes of MnII, CoII, NiII, CuII and ZnII with a new pyridylhydrazone, 2-pyridylcarbaldehyde-N,N-dimethylhydrazone (pch), are described. In all the complexes pch behaves as a bidentate ligand binding through the pyridine and azomethyne nitrogen atoms. The complexes appear to be monomeric, high spin six-coordinate, and a distorted octahedral stereochemistry around the metal is suggested. The e.p.r. results for both CuII compounds indicate a mainly dx 2–y2 ground state with a static Jahn-Teller distortion, whilst for the MnII complex the e.p.r. data indicates a very low symmetry for the MnN6 polyhedron.  相似文献   

16.
Summary A number of metal complexes of the ligand tetramethylethylenediaminetetraacetate [Edta(OMe)4 = L] have been characterised. The complexes may be formulated MLCl2 · xH2O where M2+ = MnII, FeII, CoII, NiII, CuII, CdII, HgII and SnII. I.r., conductivity, magnetic susceptibility and electronic spectral data are discussed.  相似文献   

17.
Summary The complexes of MnII, CoII, NiII, CuII, ZnII, CdII, HgII, CoIII and UO 2 2+ ions with 2-hydroxyimino-3-(2-hydrazonopyridyl)-butane (HL) have been synthesised and characterized by elemental analyses, molar conductivities, magnetic measurements and spectral (i.r., visible, n.m.r.) studies. I.r. spectra show that HL behaves as a neutral or mononegative ligand and binds in a bidentate and/or tridentate manner. Also, HL behaves as oxidizing agent towards CoII forming diamagnetic CoIII complexes depending on the preparative conditions. Different stereochemistries are proposed for MnII, CoIII, CoII, NiII and CuII on the basis of spectral and magnetic studies.  相似文献   

18.
Synthesis and antibacterial activity of metal complexes of ciprofloxacin   总被引:3,自引:0,他引:3  
The interactions of ciprofloxacin (HCipro) with transition metals have been investigated. Two types of complexes, [M(Cipro)(OAc)(H2O)2] · 3H2O (M = MnII, CoII, CuII or CdII) and [M(Cipro)(OAc)] · 6H2O (M = NiII or ZnII), were obtained and characterized by physicochemical and spectroscopic methods. The i.r. spectra of the complexes suggest that the ciprofloxacin behaves as a monoanionic bidentate ligand. In vitro antibacterial activities of the HCipro and the complexes were tested.  相似文献   

19.
Summary Reaction of one mole of acetylacetone with two moles of 4-phenylthiosemicarbazide yields the unusual Schiff base, MeC(=N-NHCSNHPh)CH2C(=NNHCSNHPh)Me. APT = H2L) acetylacetone bis(4-phenylthiosemicarbazone). The complexes of CoII, NiII, CuII, ZnII and UVIO2 have been prepared and characterized by analytical, i.r., electronic spectral and magnetic measurements. The CoII, NiII and CuII complexes have been assigned square-planar stereochemistry on the basis of magnetic and spectroscopic studies. The ligand is a neutral or dibasic quadridentate SNNS donor as revealed by i.r. spectral studies.  相似文献   

20.
Summary A convenient synthesis of the ligand ethylenediaminetetraacetamide (L) is described, and a number of metal complexes of the general formula MLCln · xH2O (Mn+=CaII, MnII, FeII, CoII, NII, CuII, ZnII, MgII, BaII, CdII, HgII and LaIII) prepared. The deprotonated Cu(L-H)2 · 2 H2O complex has been characterised and the associated pK values determined. I.r., conductivity, magnetic susceptibility and electronic spectral data are discussed.  相似文献   

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