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1.
N. Raman A. Sakthivel J. Dhaveethu Raja K. Rajasekaran 《Russian Journal of Inorganic Chemistry》2008,53(2):213-219
New N2O2 donor type Schiff bases have been designed and synthesized by condensing acetylaceto-4-aminoantipyrine/acetoacetanilido-4-aminoantipyrine
with 2-amino benzoic acid in ethanol. Solid metal complexes of the Schiff bases with Cu(II), Ni(II), Co(II), Mn(II), Zn(II),
VO(IV), Hg(II) and Cd(II) metal ions were synthesized and characterized by elemental analyses, magnetic susceptibility, molar
conduction, FAB Mass, IR, UV-Vis., 1H NMR, and ESR spectral studies. The data show that the complexes have a composition of the ML type. The UV-Vis., magnetic
susceptibility, and ESR spectral data of the complexes suggest a square planar geometry around the central metal ion, except
for VO(IV) complexes, which have square-pyramidal geometry. The redox behavior of copper and vanadyl complexes has been studied
by cyclic voltammetry. The nuclease activity of the above metal complexes shows that the complexes cleave DNA through redox
chemistry. In the presence of H2O2, all the complexes are capable of cleaving calf thymus DNA plasmids, in order to compare the cleavage efficiency of all metal
complexes in the two different ligand environments. In this assay, Cu(II), Ni(II), Co(II), and Zn(II) exhibit more cleavage
efficiency than other metal ions.
This article was submitted by the authors in English. 相似文献
2.
N. Raman J. Dhaveethu Raja A. Sakthivel 《Russian Journal of Coordination Chemistry》2008,34(6):400-406
A new series of transition metal complexes of Cu(II), Ni(II), Co(II), Mn(II), Zn(II), Cd(II), Hg(II), and VO(IV) have been
designed and synthesized from the Schiff base derived from cinnamidene-4-aminoantipyrine and 2-aminophenol by involving the
carbonyl group of 4-aminoantipyrine. The structural features have been arrived from their elemental analyses, magnetic susceptibility,
molar conduction, FAB mass, IR, UV-Vis, 1H NMR and ESR spectral studies. The data show that the complexes have composition of the ML2 type. The UV-Vis, magnetic susceptibility, and ESR spectral data of the complexes suggest an octahedral geometry around the
central metal ion except the VO(IV) complex, which has a square-pyramidal geometry. The redox behavior of the copper and vanadyl
complexes has been studied by cyclic voltammetry. The antimicrobial activity of the ligand and its complexes has been extensively
studied on microorganisms such as Salmonella typhi, Staphylococcus aureus, Escherichia coli, Bacillus subtilis, Aspergillus niger, and Rhizoctonia bataicola. It has been found that most of the complexes have higher activities than that of the free ligand. The nuclease activity
of the above metal complexes shows that the complexes cleave DNA through redox chemistry. In the presence of H2O2, the complexes are capable of cleaving calf thymus DNA.
The text was submitted by the authors in English. 相似文献
3.
A series of metal complexes of cobalt(II), nickel(II), and copper(II) having the general composition [M(L)2X2] with thioacetamide have been prepared and characterized by elemental chemical analysis, molar conductance, magnetic susceptibility
measurements, mass, IR, EPR, and electronic spectral studies. The IR spectral data suggests the involvement of sulfur and
amino nitrogen in coordination to central metal ion. On the basis of spectral studies, an octahedral geometry has been assigned
for the cobalt(II) and nickel(II) complexes whereas tetragonal geometry for copper(II) complexes. Thioacetamide and its metal
complexes have been tested in vitro against a number of microorganisms in order to assess their antimicrobial properties. 相似文献
4.
Renu Sharma Meena Nagar 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):2863-2875
A series of new mixed ligand complexes of Zn(II), Cd(II), and Hg(II) with cis-3,7-dimethyl-2,6-octadienthiosemicarbazone (CDOTSC; LH) and N-phthaloyl amino acids (AH) have been synthesized by the reaction of metal dichloride with ligands CDOTSC and N-phthaloyl derivative of DL-glycine (A1H), L-alanine (A2H), or L-valine (A3H) in a 1:1:1 molar ratio in dry refluxing ethanol. All the isolated complexes have the general composition [M(L)(A)]. The plausible structure of these newly synthesized complexes has been proposed on the basis of elemental analyses, molar conductances, molecular weight measurement, and various spectral (IR, 1H NMR, and 13C NMR) studies, and four coordinated geometries have been assigned to these complexes. All the complexes and ligands have been screened for their antibacterial activity. 相似文献
5.
Renu Sharma Meena Nagar 《Phosphorus, sulfur, and silicon and the related elements》2013,188(7):1526-1535
A series of new mixed ligand complexes of Zn(II), Cd(II), and Hg(II) with citronellal thiosemicarbazone [3,7-dimethyl-6-octene-1-a1 thiosemicarbazone (LH)] and N-phthaloyl amino acids (AH) have been synthesized by the reaction of metal(II) chloride with ligands citronellal thiosemicarbazone (DOTSC) and N-phthaloyl glycine [1,3-dihydro-1,3-dioxo-2H-isoindole-2-acetic acid (A1H)] or N-phthaloyl alanine [1,3-dihydro-1,3-dioxo-α(methyl)-2H-isoindole-2-acetic acid (A2H)] in 1:1:1 molar ratio in dry refluxing ethanol. All the complexes have been characterized by elemental analyses, molar conductance measurement, molecular weight measurement, IR, and multinuclear NMR (1H and 13C{1H}) spectral studies. IR, 1H, and 13C{1H} NMR spectral studies suggest the involvement of azomethine-N, thiol-S atoms of the thiosemicarbazone moiety and both carboxylate-O of N-phthaloyl amino acid moiety in coordination with central metal(II) ion, and four coordinated geometries have been assigned to these complexes. The free ligands and metal complexes have been screened for their antifungal activity against two fungal strains, Fusarium moniliformae and Macrophomina phaseolina, using the the radial growth method. The results of antifungal activity show that metal complexes show enhanced higher activity than the free ligands. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file. 相似文献
6.
《Journal of Coordination Chemistry》2012,65(7):1100-1111
Complexes of Ni(II), Co(II), Cu(II), Zn(II), Cd(II), Hg(II) and U(VI)O2 with 2-acetylpyridine-[N-(3-hydroxy-2-naphthoyl)] hydrazone (H2APHNH) have been prepared and characterized by elemental analysis, molar conductance, thermal (TG, DTG), spectral (1H NMR, IR, UV–Vis, ESR) and magnetic measurements. 1H NMR spectrum of the ligand suggests the presence of intramolecular hydrogen bonding. IR spectra show that H2APHNH is a bidentate, tridentate and/or tetradentate ligand. Thermal decomposition of some complexes ended with metal oxide as a final product. ESR spectra gave evidence for the proposed structure and the bonding for some Cu(II) complexes. Biological activity measurements were carried out. 相似文献
7.
《Journal of Coordination Chemistry》2012,65(14):2274-2287
New Schiff bases have been synthesized from benzofuran-2-carbohydrazide and benzaldehyde, [BPMC] or 3,4-dimethoxybenzaldehyde, [BDMeOPMC]; complexes of the type MLX2, where M = Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II), L = BPMC or BDMeOPMC and X = Cl, have been prepared. Structures have been elucidated on the basis of elemental analysis, conductance measurements, magnetic properties, spectral studies i.e., 1H NMR, electronic, ESR and IR studies show that the Schiff bases are bidentate through the azomethine nitrogen and oxygen of the carbonyl. We propose tentative structures for all of these complexes. The antifungal and antibacterial activities of the ligands and their metal complexes have been screened against fungi Aspergillus niger and Aspergillus fumigatus and against bacteria Escherichia coli and S. aurious. 相似文献
8.
A novel Schiff base has been designed and synthesized using the bioactive ligand obtained from 4-aminoantipyrine, 3,4-dimethoxybenzaldehyde and 2-aminobenzoic acid. Its Cu(II), Co(II), Ni(II), Zn(II) complexes have also been synthesized in ethanol medium. The structural features have arrived from their elemental analyses, magnetic susceptibility, molar conductance, mass, IR, UV–Vis, 1H NMR and ESR spectral studies. The data show that the complexes have composition of ML2 type. The electronic absorption spectral data of the complexes suggest an octahedral geometry around the central metal ion. The interaction of the complexes with calf thymus (CT) DNA has been studied using absorption spectra, cyclic voltammetric, and viscosity measurement. The metal complexes have been found to promote cleavage of pUC19 DNA from the super coiled form I to the open circular form II. The complexes show enhanced antifungal and antibacterial activities compared with the free ligand. 相似文献
9.
A new series of transition metal complexes of Cu(II), Ni(II), Co(II), Mn(II), Zn(II), VO(IV), Hg(II) and Cd(II) have been
synthesized from the Schiff base (L) derived from 4-aminoantipyrine, 3-hydroxy-4-nitrobenzaldehyde and o-phenylenediamine. Structural features were obtained from their elemental analyses, magnetic susceptibility, molar conductance,
mass, IR, UV-Vis, 1H NMR and ESR spectral studies. The data show that these complexes have composition of ML type. The UV-Vis, magnetic susceptibility
and ESR spectral data of the complexes suggest a square-planar geometry around the central metal ion except VO(IV) complex
which has square-pyramidal geometry. The redox behaviour of copper and vanadyl complexes was studied by cyclic voltammetry.
Antimicrobial screening tests gave good results in the presence of metal ion in the ligand system. The nuclease activity of
the above metal complexes shows that Cu, Ni and Co complexes cleave DNA through redox chemistry whereas other complexes are
not effective. 相似文献
10.
《Journal of Coordination Chemistry》2012,65(3):347-353
The mononuclear complexes of Zn(II), Cd(II) and Hg(II), [Zn(phen-dione)Cl2], [Cd(phen-dione)Cl2] and [Hg(phen-dione)Cl2], where phen-dione?=?1,10-phenanthroline-5,6-dione, have been synthesized and characterized by elemental analysis and IR, 1H?NMR and electronic absorption spectroscopies. The ν(C=O) of coordinated phen-dione ligands in these complexes shows that the phen-dione is not coordinated to metal ion from its C=O sites. Electronic spectra of the complexes show two absorption bands for intraligand transitions. These absorption bands show dependence on the dielectric constant of solvents. These complexes exhibit an intense fluorescence band around 545?nm in DMSO when the excitation wavelengths are 200?nm at room temperature. 相似文献
11.
Biacetylmonoxime-salicoylhydrazone (BMSH) complexes of the types [Hg(BMSH)Cl2] and [M(BMSH-H)2], where M = Cu(II), Co(II), Ni(III), Mn(II), Zn(II), Cd(II) and UO2(VI), have been prepared and characterized by conventional chemical and physical measurements. The IR spectra show that the ligand usually coordinates via carbonyl oxygen (CO), azomethine nitrogen (CNl) and phenolic OH with replacement of hydrogen by metal ions but acts as a bidentate molecule coordinating through (CO) and (CNl) in the Hg(II) complex. The magnetic and spectral data of the Co(II) and Ni(II) complexes support octahedral stereochemistry, whilst tetragonally distorted octahedral geometry is suggested for the Cu(II) complex. 相似文献
12.
《Journal of Coordination Chemistry》2012,65(15):2645-2656
Schiff bases o-vanilidene-1-aminobenzene (HL1) and o-vanilidene-2-methyl-1-aminobenzene (HL2) lead to the formation of mono- and bis-[(Cl)Zn(L1)] (1), [(Cl)Zn(L2)] (2), [(Cl)Hg(L1)] (3), [(Cl)Hg(L2)] (4), [Zn(L1)2] (5), [Zn(L2)2] (6), [Hg(L1)2] (7), and [Hg(L2)2] (8) complexes by reactions of zinc(II) and mercury(II) chlorides in different mole ratio(s). Complexes 1–8 have been characterized by elemental analyses (Zn, Hg, C, H, Cl, and N), melting point and spectral (IR, 1H-NMR), PXRD, molar conductivity measurement, and TGA. Conductivity measurements suggest non-electrolytes. Structural compositions have been assigned by mass spectral studies. Four-coordinate geometry may be assigned to these complexes tentatively. Structural study reveals that in 1–4 two metal centers are held together by two bridged (μ2-Cl) chlorides, whereas 5–8 contain two bidentate Schiff-base ligands around one metal-producing monomers. 相似文献
13.
《Journal of Coordination Chemistry》2012,65(21):3740-3750
Complexes [M(L)(L′)Cl?·?H2O], where M?=?Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Hg(II), L?=?ligand derived from reaction between benzofuran-2-carbohydrazide and 3,4,5-trimethoxybenzaldehyde (TMeOBFC) and L′?=?2-aminothiophenol (2-atp), have been synthesized. The structures of the complexes have been proposed from analytical data, IR, UV-Vis, 1H NMR, direct analysis in real time-mass spectra, ESR spectral data, magnetic, and thermal studies. The complexes are soluble in DMF and DMSO. Molar conductance values indicate that the complexes are non-electrolytes. Antibacterial and antifungal activities of the ligands and their metal complexes have been obtained against bacteria Escherichia coli and Staphylococcus aureus and against fungi Aspergillus niger and Aspergillus flavus. 相似文献
14.
Polymeric chelates of the type [ML2]n where M = Ni(II), Cu(II), Zn(II) or Co(II), L = poly(resacetophenone diyl ethylene)s, andn= degree of polymerization, have been synthesized. Their structures have been elucidated on the basis of analytical, magnetic,
electronic and IR spectral studies. Electronic spectra in conjunction with magnetic moments are in accord with an octahedral
environment around the central metal ion in all polymeric chelates except Cu(II) and Zn(II) polymeric chelates which have
been shown to possess square planar and tetrahedral geometries, respectively. IR spectral studies further suggest that the
metal ions are coordinated through the oxygens of the carbonyl and the phenolic hydroxyl groups. All the chelates are paramagnetic
except Zn(II), which is found to be diamagnetic. 相似文献
15.
Hanan F. Abd El-Halim F. A. Nour El-Dien Gehad G. Mohamed Nehad A. Mohamed 《Journal of Thermal Analysis and Calorimetry》2012,109(2):883-892
Metal complexes having the general composition [MCl2(H2O)2(L)2]·yH2O (where y?=?1?C3, M?=?Mn(II), Cu(II), Co(II), Ni(II), and Zn(II) and L?=?miconazole drug?=?MCNZ) and [MCl2(H2O)2(L)2]Cl·3H2O (where M?=?Cr(III) and Fe(III)) have been synthesized. All the synthesized complexes were identified and confirmed by elemental analyses, IR, diffused reflectance, and thermal analyses (TG and DTA) techniques as well as molar conductivity and magnetic moment measurements. The molar conductance data reveals that bivalent metal complexes are non-electrolytes while Cr(III) and Fe(III) complexes are electrolytes and of 1:1 type. IR spectral studies reveal that MCNZ is coordinated to the metal ions in a neutral unidentate manner with N donor site of the imidazole-N. On the basis of magnetic and solid reflectance spectral studies, an octahedral geometry has been assigned for the complexes. Detailed studies of the thermal properties of the complexes were investigated by thermogravimetry (TG) and differential thermal analyses (DTA) techniques and the activation thermodynamic parameters are calculated using Coats?CRedfern method. The free MCNZ drug and its complexes were also evaluated against bacterial species (P. aeruginosa, S. aureus, B. subtilis, E. Coli) and fungi (A. fumigatus, P. italicum, and C. albicans) in vitro. The activity data show that the metal complexes have higher biological activity than the parent MCNZ drug. 相似文献
16.
The synthesis and characterization of Co(II), Ni(II), Cu(II), Zn(II), Ag(I), Cd(II) and Hg(II) complexes of isatin-3-oxime (H2OXI) are reported. Elemental analysis, infrared spectroscopy, thermal analysis and X-ray powder diffraction were used to characterize the complexes. The IR spectral data show that the ligand behaves in a monodentate or a bidentate manner in the different complexes. The compositions of the prepared complexes were Ag(HOXI), Hg(OXI) and M(HOXI)2 for M=Co(II), Ni(II), Cu(II), Zn(II) and Cd(II).This revised version was published online in November 2005 with corrections to the Cover Date. 相似文献
17.
K. Lutfar Rahman M. A. Mamun M. Q. Ehsan 《Russian Journal of Inorganic Chemistry》2011,56(9):1436-1442
Metal complexes of Niacin (3-pyridin carboxylic acid) were prepared in aqueous medium and characterized by different physico-chemical
methods. On the basis of elemental analysis the empirical formula of the complexes have been proposed as [Fe(C6H4NO2)]Cl2, [Co(C6H4NO2)]Cl, [Zn(C6H4NO2)]Cl, [Cd(C6H4NO2)]Cl and [Hg(C6H4NO2)]Cl. IR spectral data indicate that the metal-ligand bonding occurs through nitrogen atom of aromatic ring and oxygen atom
of COO−-group. UV-visible spectra show that Fe(III) and Co(II) complexes show d-d electronic transition in addition to π → π*, n → π* and n → σ* transitions. The Fe(II) and Co(II) complexes are paramagnetic. QSTG analysis data strongly support the absence of water
molecules in the complexes, and the weight of the residue corresponds to the respective metal oxides. Cyclic voltammetric
studies suggest that the redox properties of Zn(II), Cd(II) and Hg(II) in their complexes are modified compared to the uncoordinated
metal ion. The CV data also indicate that the charge transfer processes are not reversible. 相似文献
18.
V. Cârcu M. Negoiu T. Rosu S. Serban 《Journal of Thermal Analysis and Calorimetry》2000,61(3):935-945
A series of coordination complexes with the compositions CuL, NiL×2H2 O, ML2 Cl2 (M =Pt(II), Hg(II)) and M(L-H)2 (M =Pd(II)), Cd(II)), where L =N-benzoyl-N'-2-nitro-4-methoxyphenylthiourea, were synthesized and characterized by conductance, EPR, IR and electronic
spectral studies and thermogravimetric analysis. The IR and electronic spectra suggest coordination through the thiocarbonyl
S and carbonyl O in the Pd(II) and Cd(II) complexes, and S bonding for the Pt(II) and Hg(II) complexes. The Cu(II) and Ni(II)
complexes have polymeric structures in which the ligand is coordinated via the N, O and S atoms.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
19.
Golcuk K Altun A Kumru M 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2003,59(8):1841-1847
The complexes having the MBr(2)L(2) (M: Zn, Cd and Hg; L: m-methylaniline) formulae have been prepared and characterized by their elemental analyses, thermogravimetric analyses, IR and Raman spectral studies. IR and Raman bands of the complexes have been assigned as compared with the free ligand. Coordination effects on the internal modes of m-methylaniline have been discussed. Vibrational spectra propose that the [ZnBr(2)(mMA)(2)] complex is in a tetrahedral environment around Zn(II) ion with C(2v) symmetry whereas Cd(II) and Hg(II) complexes have 5-coordinate polymeric bromide bridged structures. 相似文献
20.
Balachandra G. Sejekan Prof. Dr. Gopalaswamiengar Aravamudan 《Monatshefte für Chemie / Chemical Monthly》1978,109(1):165-177
The complexation tendencies of N,N-di-(-hydroxyethyl)-dithiocarbamic acid [DEADTCH, (CH2CH2OH)2NCSSH] towards a large number of metal ions have been examined. The complexes formed with transition and post-transition metal ions in slightly acidic and neutral solutions have the general formulaM(DEADTC)
x, wherex is the valence state of the metal,M=Cr(III), Fe(III), Co(III), Ni(II), Cu(II), Zn(II), Cd(II), Hg(II), Tl(I), and Tl(III). In addition the interesting mixed ligand complex ClHg(DEADTC) was prepared. These complexes have been characterised through X-ray, magnetic, conductance and spectral (UV and IR) measurements. 相似文献