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1.
Schiff bases derived from 4-aminomethylcarbostyril and their transition metal complexes with CoII, NiII, CuII and ZnII have been synthesized and characterized by elemental analysis, molar conductance, magnetic susceptibilities electronic, IR,
PMR, ESR, FAB-Mass and thermal studies. From the above spectral studies it is concluded that the ligands of 4-substituted
carbostyril Schiff bases, viz, salicylidene 4-aminomethylcarbostyril (SAMC); o-vanillinsalicylidene 4-aminomethylcarbostyril (VAMC) and 5′ chlorosalicylidene 4-aminomethylcarbostyril (CSAMC) act as bidenate
molecules coordinating through azomethine nitrogen and phenolic oxygen. The ligands and their metal complexes have been screened
in vitro for antibacterial, antifungal and antitumor activity. The results indicate that the biological activity increases on complexation.
The CuII complexes of the above ligands show greater inhibitory action towards the P388/s tumor cells at lower concentrations. 相似文献
2.
E. Yu. Fursova O. V. Kuznetsova V. I. Ovcharenko G. V. Romanenko A. S. Bogomyakov M. A. Kiskin I. L. Eremenko 《Russian Chemical Bulletin》2007,56(9):1805-1808
A method was developed for the synthesis of mixed-metal heterospin compounds with the direct coordination of the nitroxide
fragment based on the replacement of acetonitrile molecules in the heterotrinuclear complex [Co2Gd(NO3)Piv6(CH3CN)2] with nitroxide molecules. The molecular and crystal structure of the heterospin mixed-ligand heterotrinuclear CoII, GdIII, CoII complex [Co2Gd(NO3)Piv6(NIT-Me)2], where NIT-Me is stable nitronyl nitroxide, was established. The magnetic properties of this complex were investigated in
the temperature range of 2–300 K. The coordination of nitroxide groups to CoII ions is responsible for strong exchange interactions between the unpaired electrons in the exchange clusters {>-·O-CoII}, resulting in the virtually complete spin coupling between each coordinated >N-·O group and one of the unpaired electrons
of each CoII ion at temperatures below 200 K.
Dedicated to Academician G. A. Abakumov on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1742–1745, September, 2007. 相似文献
3.
Samir S. Kandil Saud M. A. Katib Naeema H. M. Yarkandi 《Transition Metal Chemistry》2007,32(6):791-798
Platinum(II), palladium(II) and nickel(II) complexes with N-allyl-N′-pyrimidin-2-ylthiourea were synthesized in 1:1 and 1:2 [metal:ligand] stoichiometric ratios and characterized by elemental
analyses, molar conductivities, magnetic susceptibilities and by i.r., u.v.-vis., 1H- and 13C-n.m.r. and mass spectra. The 1H- and 13C- n.m.r. chemical shifts reveal coordination of one pyrimidine-N and sulphur atoms to PtII and PdII. The i.r. spectra indicate that the ligand behaves as a neutral monodentate towards NiII; coordinates via a pyrimidine-N and as a bidendate towards PdII and PtII coordinates via thione-S and a pyrimidine-N. The magnetic moments and electronic spectral data suggest a square-planar geometry for PtII and PdII complexes, a mixture of square-planar and tetrahedral geometries for the tetracoordinate NiII complex and octahedral for the six-coordinate one. The E.I. mass spectra of the complexes showed some isotope ion peaks of
[M]+ and fragments containing metals; assignments of fragments containing metal ions were supported by the appearance of their
peaks among isotope clusters. 相似文献
4.
Six new macrocyclic complexes were synthesized by reaction of 1,4-bis(2-carboxyaldehyde phenoxy)butane with various diamines.
Then, their nickel(II) perchlorate complexes were synthesized by the template effect by reaction of 1,4-bis(2-carboxyaldehyde
phenoxy)butane, Ni(ClO4)2 · 6H2O and various diamines. The metal-to-ligand ratio of NiII metal complexes was found to be 1:1. The compounds are coordinated to the central metal as tetradentate O2N2 ligands The NiII complexes are proposed to exhibit tetrahedral geometry. NiII metal complexes are 1:2 electrolytes as shown by their molar conductivities (ΛM) in DMF (dimethyl formamide) at 10−3
m. The structure of NiII metal complexes is proposed from elemental analysis, f.t.-i.r., u.v.-vis., magnetic susceptibility measurements, molar conductivity
measurements and mass spectra. 相似文献
5.
E. K. Beloglazkina A. G. Majouga A. A. Moiseeva M. G. Tsepkov N. V. Zyk 《Russian Chemical Bulletin》2007,56(2):351-355
The reaction of 5-[2-(methylthio)ethyl]-3-phenyl-2-thioxoimidazolidin-4-one (LH) with salts MCl2· xH2O (M = Co, Ni, Cu; x = 2, 6) afforded the [M(L)Cl]n complexes of NiII, CoII, and CuII. The electrochemical behavior of the LH ligand and its complexes was studied using the cyclic voltammetry and rotating disk
electrode techniques. The structures of the synthesized compounds were determined by the data of UV—Vis and IR spectroscopy,
mass spectrometry, and electrochemical characteristics.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 339–343, February, 2007. 相似文献
6.
Nizam M. El-Ashgar Issa M. El-Nahhal Mohamed M. Chehimi Michel Delamar Florence Babonneau Jacques Livage 《Journal of Sol-Gel Science and Technology》2007,41(1):3-10
A new insoluble solid functionalized ligand system bearing chelating ligand group of the general formula P-(CH2)3-N[CH2CONH(C6H4)NH2]2, where P represents [Si–O]
n
polysiloxane network, was prepared by the reaction of the immobilized diethyliminodiacetate polysiloxane ligand system, P-(CH2)3N(CH2CO2Et)2 with 1,2-diaminobenzene in toluene. 13C CP-MAS NMR, XPS and FTIR results showed that most ethylacetate groups (–COOEt) were converted into the amide groups (–N–C=O).
The new functionalized ligand system exhibits high capacity for extraction and removal of the metal ions (Fe3+, Co2+, Ni2+, Cu2+ and Zn2+) with efficiency of 95–97% after recovery from its primary metal complexes. This functionalized ligand system formed 1:1
metal to ligand complexes. 相似文献
7.
A. I. Uraev I. S. Vasil’chenko G. S. Borodkin I. G. Borodkina V. G. Vlasenko A. S. Burlov L. N. Divaeva K. A. Lyssenko M. Yu. Antipin A. D. Garnovskii 《Russian Chemical Bulletin》2005,54(3):633-640
New metal chelates of ZnII and CdII (ML2) based on (4Z)-3-methyl-1- phenyl-5-thioxo-1,5-dihydro-4-H-pyrazol-4-one quinolin-8-ylhydrazone (HL1) and (4Z)-5- methyl-2-phenyl-4-[(quinolin-8-ylimino)methyl]-2,4-dihydro-3H-pyrazole-3-thione (HL2) were synthesized. The structures of the metal chelates were studied by EXAFS and NMR (1H, 13C, and 111Cd) spectroscopy. The structure of the Cd(L1)2 complex was established by X-ray diffraction analysis. The complexes have pseudooctahedral structures with the N4S2 ligand environment.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 623–629, March, 2005. 相似文献
8.
Isothermal titration calorimetry has been used to determine the stoichiometry, formation constants and thermodynamic parameters
(ΔG
o, ΔH, ΔS) for the formation of the citrate complexes with the Mn2+, Co2+, Ni2+ and Zn2+ ions. The measurements were run in Cacodylate, Pipes and Mes buffer solutions with a pH of 6, at 298.15 K. A constant ionic
strength of 100 mM was maintained with NaClO4. The influence of a metal ion on its interaction energy with the citrate ions and the stability of the resulting complexes
have been discussed. 相似文献
9.
Tahir Ali Khan Sultana Naseem Yasser Azim Shama Parveen Mohammad Shakir 《Transition Metal Chemistry》2007,32(6):706-710
A novel series of 16-membered binuclear complexes of octaazatetraimine ligand,
[M = MnII, CoII, NiII, CuII and ZnII; X = Cl or NO3] have been synthesized by metal template condensation reactions of o-phenylenediamine with N,N′-diacetylhydrazine in 1:1:1 molar ratio in methanol. The proposed stoichiometry and the bonding of the macrocyclic moiety
to metal ions along with the overall stereochemistry have been derived from the results of elemental analyses, magnetic susceptibility,
conductivity data and the spectral data revealed from FT-IR,
, ESI mass, UV–visible studies. An octahedral geometry has been envisaged for MnII, CoII, and NiII complexes while a slight distortion in octahedral geometry has been noticed for CuII complexes. The low conductivity data of all the complexes suggest their non-ionic nature. 相似文献
10.
V. I. Ovcharenko S. V. Fokin G. V. Romanenko A. S. Bogomyakov D. S. Yachevskii D. L. Chizhov V. N. Charushin O. N. Chupakhin 《Russian Chemical Bulletin》2010,59(6):1162-1174
Dinuclear heterospin complexes of CuII and MnII 1,1,1,7,7,7-hexafluoroheptane-2,4,6-trionates ([Cu2L2] and [Mn2L2], respectively) with nitronyl nitroxides 2-R-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide 1-oxyls (NIT-R, R = H, Me, Et, m-C5H4N, m-NCC6H4, p-NCC6H4, PzMe) and the diradical NIT-Pz-(CH2)4-Pz-NIT (Pz is 1,4-pyrazolylene) were synthesized and structurally characterized. In the complexes under study, the CuII atom
tends to have the square-pyramidal coordination environment, and the MnII atom is in an octahedral environment. The magnetochemical
investigation of the compounds in the temperature range of 2–300 K showed that the antiferromagnetic exchange coupling dominates
in the [Cu2L2] molecules, whereas this coupling in [Mn2L2] is manifested in the experimental plot μeff(T) at T < 100 K. The magnetic properties of the heterospin complexes of [Cu2L2] with NIT-R are also determined by the intramatrix antiferromagnetic exchange coupling. For the complexes of [Mn2L2] with NIT-R, the coordination mode of the nitroxide plays a decisive role. 相似文献
11.
E. V. Starodubtseva O. V. Turova M. G. Vinogradov L. S. Gorshkova V. A. Ferapontov 《Russian Chemical Bulletin》2005,54(10):2374-2378
The rate of hydrogenation of γ-ketoesters MeCOCH2CH2COOR (R = Et, Pri, But) in the presence of the chiral RuII—BINAP catalyst (BINAP is 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl) greatly increases upon the addition of 5–10 equivalents
of HCl with respect to ruthenium. In the hydrogenation of ethyl levulinate, the optically active γ-hydroxy ester initially
formed would cyclize by ∼95% to give γ-valerolactone with optical purity of 98–99% ee. When the Ru(COD)(MA)2—BINAP—HCl catalytic system is used (COD is 1,5-cyclooctadiene, MA is 2-methylallyl), complete conversion of the ketoester
(R = Et) in EtOH is attained in 5 h at 60 °C under an H2 pressure of 60–70 atm.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2301–2304, October, 2005. 相似文献
12.
Meryem Çamur Mustafa Bulut Ali R. Özkaya Mehmet Kandaz Nurettin Yaylı 《Transition Metal Chemistry》2007,32(5):642-648
A new vic-dioxime bearing coumarin functionality, N′1,N′2-Dihydroxy-N
1,N
2-bis(4-methyl-2-oxo-2H-chromen-7-yl)oxalimidamid (LH2), N,N-bis-[4-methylcoumarinyl]-diamino glyoxime (LH2), and its mono- and dinuclear complexes {copperII, cobaltII, nickelII and uranylII} have been reported. The fluorescence excitation and emission spectra of LH2 and its complexes with metal ions were examined. It was observed that fluorescence and excitation emission intensity of LH2 was quenched depending on complex formation with metal ions. The characterizations of all newly synthesized compounds were
made by elemental analysis, 1H-n.m.r, i.r., u.v.–vis., and l.c-m.s./m.s. data. Electrochemical behaviour of the ligand involving oxime and coumarine moieties,
and its complexes with NiII, CuII, CoII and UO
2
II
were investigated by cyclic voltammetry. The comparison of the electrochemical behaviour of the ligand with its complexes
enabled us to identify metal-, oxime- and coumarine-based signals. 相似文献
13.
The effect of ligand environment on the mechanism of enantiomerization of BeII, ZnII, and CuII bischelate aminovinylketonate complexes was studied by the B3LYP/6-311++G(d,p) method. Substituents at the nitrogen atom
(R = H, Me, Pri) significantly affect the mechanism of enantiomerization. In the beryllium complexes, the diagonal twist mechanism is changed
to the dissociation mechanism. In the zinc complexes, only the diagonal twist mechanism is realized. The barrier to reaction
monotonically increases with the size of the substituent. In the copper complexes, the effect of substituents manifests itself
in the change in the relative stabilities of different forms. At R = H, the square-planar form is more stable, while the tetrahedral
configuration is favorable at R = Pri. For the CuII complex with R = Me, the energy difference between two forms is less than 1 kcal mol-1, which leads to stabilization of the squareplanar structure in the solid state, whereas the tetrahedral form is more stable
in solution. 相似文献
14.
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
15.
A. R. Mustafina I. Ya. Zagidullina V. I. Maslennikova O. S. Serkova T. V. Guzeeva A. I. Konovalov 《Russian Chemical Bulletin》2007,56(2):313-319
New phosphorylated calix[4]resorcinarene and cavitands were synthesized. Their extraction ability toward LaIII, GdIII, and YbIII ions was studied. The cavitands are more efficient extracting agents than octasubstituted calix[4]resorcinarenes. The nature
of substituents at the nitrogen atom at the upper rim and hydrophobic substituents at the lower rim exerts a substantial effect
on the solubility of the extracted complex in chloroform. Coordination of two lanthanide ions with an extragent molecule results
in their efficient but non-selective extraction. The literature and our spectral (31P NMR) data suggested that the ligand in the extracted complex has most probably a “kite” conformation.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 303–308, February, 2007. 相似文献
16.
T. N. Kropacheva V. I. Kornev D. A. Loginov V. I. Meshcheryakov E. V. Mutseneck D. V. Muratov D. S. Perekalin L. S. Shul’pina A. R. Kudinov 《Russian Chemical Bulletin》2005,54(10):2354-2358
New dinuclear ruthenium manganese complexes of general composition (bpy)2Ru(L)MnClx(H2O)2 (L is 1,10-phenanthroline-5,6-dione, 3,3′-dicarboxy-2,2′-bipyridyl, or bis(pyrazolyl); x = 2 or 4) were synthesized by the reaction of (bpy)2Ru(L) with MnCl2 · 4H2O. These compounds and the starting mononuclear ruthenium complexes were studied by spectrophotometric and electrochemical
methods in MeCN. The position of the charge-transfer band RuII → L in the spectra depends on the donor-acceptor characteristics of the ligand L. For the dinuclear complex under study,
the formal potentials of reversible one-electron oxidation of RuII are in the range of 0.9–1.2 V (vs. the standard hydrogen electrode), whereas oxidation of MnII occurs at more positive (by 0.1–0.2 V) potentials.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2281–2285, October, 2005. 相似文献
17.
Naik Anil D. Annigeri Satish M. Gangadharmath Umesh B. Revankar Vidyanand K. Mahale Vinayak B. 《Transition Metal Chemistry》2002,27(3):333-336
The binucleating ligand LH3, 2,6-diformyl-p-cresol-bis(phenylthioacetyldrazone), a Schiff base condensation product of 2,6-diformyl-p-cresol and phenylthioacetyldrazide forms complexes of the [M2ClL] type with CoII, NiII and CuII ions, which were characterized by elemental analysis, magnetic susceptibility, electronic spectra, molar conductance, i.r., n.m.r., e.p.r., t.g. and FAB mass spectral measurements. Sub-normal magnetic moments indicate the operation of antiferromagnetic coupling between the metal centres. The ligand and its copper complex show a pronounced fungistatic activity. 相似文献
18.
Huaze Dong Xia Liu Juan Yang Zhaolian Chu Wei Huang Shaohua Gou 《Transition Metal Chemistry》2007,32(4):518-522
Reactions of sodium 4-pyridin-2-yl-pyrimidine-2-sulfonate (NaL) with CuII and MnII ions in water produced a zig-zag chain polymer, [CuL(NCS)]
n
(1), and a dinuclear complex, [Mn2L2Cl2(H2O)2] (2), respectively. It is observed that counteranions and hydrogen bonds play basic roles in the resulting structure in which
3D networks were formed through intermolecular hydrogen bonding. 相似文献
19.
Natarajan Raman Chinnathangavel Thangaraja Samuelraj Johnsonraja 《Central European Journal of Chemistry》2005,3(3):537-555
A novel tetradentate N2O2 type Schiff base, synthesized from 1-phenyl-2,3-dimethyl-4-aminopyrazol-5-one(4-aminoantipyrine) and 3-salicylidene-acetylacetone,
forms stable complexes with transition metal ions such as Cu
II
, Ni
II
, Co
II
and Zn
II
in ethanol. Microanalytical data, magnetic susceptibility, IR, UV-Vis.,1H-NMR, ESR and Mass spectral techniques were used to confirm the structures. Electronic absorption spectra of the complexes
suggest a square-planar geometry around the central metal ion. These complexes show higher conductance values, supporting
their electrolytic nature. The monomeric nature of the complexes was confirmed from their magnetic susceptibility values.
Cyclic voltammogram of the copper(II) and nickel(II) complexes in DMSO solution at 300 K were recorded and the results are
discussed. The X-band ESR spectra of the copper complex were recorded and the molecular orbital coefficient values were calculated
from the spectra. The in vitro antimicrobial activities of the investigated compounds were tested against bacteria such as Klebsiella pneumoniae, Staphylococcus aureus, Bacillus subtilis and Escherichia coli and fungi like Aspergillus niger and Rhizoctonia bataicola. Most of the metal chelates show higher antimicrobial activity for the above microorganisms than that of the free ligand. 相似文献
20.
P. Muralidhar Reddy Adapa V. S. S. Prasad Vadde Ravinder 《Transition Metal Chemistry》2007,32(4):507-513
Macrocyclic CuII compounds of the type Cu(L4)Cl2 (where L4 = N4 or N2O2 donor macrocyclic ligand) have been synthesized by treating the corresponding macrocycles with copper chloride in methanol.
These compounds were characterized with the help of elemental analysis, i.r., mass, ESR, electronic spectra, conductance,
magnetic and thermal studies. Distorted octahedral geometry has been proposed for all of these compounds. These compounds
were found to be efficient in the catalytic oxidation of ascorbic acid and the percentage yields of oxidation products were
determined spectrophotometrically. The biological activities of these compounds have been tested against gram +ve and gram
−ve bacteria and found to be more active when compared with commercially available antibacterials like streptomycin and ampicillin. 相似文献