共查询到10条相似文献,搜索用时 953 毫秒
1.
Mohamad Jaber Al-Jeboori Hasan Ahmad Hasan Worood A. Jaafer Al-Sa’idy 《Transition Metal Chemistry》2009,34(6):593-598
The new multidentate Schiff-base (E)-6,6′-((1E,1′E)-(ethane-1,2-diylbis(azan-1-yl-1-ylidene))bis(methan-1-yl-ylidene))bis(4-methyl-2-((E)(pyridine-2-ylmethylimino)methyl)phenol) H2L and its polymeric binuclear metal complexes with Cr(III), Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II)
are reported. The reaction of 2,6-diformyl-4-methyl-phenol with ethylenediamine in mole ratios of 2:1 gave the precursor 3,3′-(1E,1′E)-(ethane-1,2-diylbis(azan-1-yl-1ylidene))bis(methan-1-yl-1-ylidene)bis(2-hydroxy-5-methylbenzaldehyde) W. Condensation of the precursor with 2-(amino-methyl)pyridine in mole ratios of 1:2 gave
the new N6O2 multidentate Schiff-base ligand H2L. Upon complex formation, the ligand behaves as a dibasic octadentate species with the involvement of the nitrogen atoms
of the pyridine groups in coordination for all complexes. The mode of bonding and overall geometry of the complexes were determined
through physico-chemical and spectroscopic methods. These studies revealed octahedral geometries for Cr(III), Mn(II), Fe(II),
Co(II), Ni(II), Cu(II), Cd(II) and Hg(II) complexes of general formulae [Cr2III(L)Cl2]Cl2, [Ni2II(L)(H2O)2]Cl2 and [M2(L)Cl2] and five co-ordinate Zn(II) complex of general formula [Zn2II(L)]Cl2. 相似文献
2.
A binaphthyl-linked bipyridyl compound, 1,1′-bis(6-methyl-6′-oxymethylenyl-2,2′-bipyridine)binaphthyl, (L) has been synthesised and used as a ligand for the formation of Cu(II), Ni(II), and Co(II) complexes. The ligand and its
transition-metal complexes were characterized by physico-chemical and spectroscopic methods. The complexes were also investigated
for cytotoxic activity. The cytotoxicity of complexes, CuL(ClO4)2, NiL(ClO4)2(H2O), CoL(ClO4)2, were tested in vitro applying seven well-characterized human tumor cell lines, MCF7, EVSA-T, WIDR, IGROV, M19 MEL, A498,
H226, and the microculture sulforhodamine B (SRB) test. All complexes show a very high cytotoxicity (ID50 < 250 ng/ml) in these cell lines. 相似文献
3.
Mono-, bi-, and tetranuclear cyclopalladized complexes based on 2-(2-thienyl)pyridine and 2-phenylpyridine with pyridine and
4,4′-bipyridyl were prepared and characterized by the methods of 1H NMR, electron absorption and emission spectroscopy, and also by the voltammetry method. The values of the coordination-induced
shifts of proton in the ligands of the complexes were determined; the upfield displacement of chemical shifts of protons of
the cyclopalladized ligand nearest to the metal was assigned to the anisotropic action of a ring current of the pyridine rings
orthogonal to the coordination plane in 4,4′-bipyridyl and pyridine. Long-wave absorption bands of the complexes were assigned
to the spin-allowed optical d-π charge-transfer transitions, and the bands of the low-temperature phosphorescence, to the intraligand π-πNyyC* transitions. Three waves of the reduction of the complexes were assigned to the ligand-centered processes of successive electron
transfer on π* orbitals preferentially localized on coordinated pyridine and cyclopalladized ligands. 相似文献
4.
Süleyman Gürsoy Ali Cihan Makbule B. Koçak Özer Bekaroğlu 《Monatshefte für Chemie / Chemical Monthly》2001,132(8):967-972
Summary. A new soluble vic-dioxime 1,4-(isobutyl)-2,3-bis-(hydroxyimino)-5,6-phenylpiperazine was prepared as a mixture of isomers from anti-dichloroglyoxime and N,N′-bis-(isobutyl)-stilbendiamine which reacts to N,N′-coordinated planar metal complexes with Ni(II), Cu(II), Co(II), and Pd(II).
Oxidation of the Co(II) complex in the presence of pyridine leads to an octahedral complex containing pyridine and chloride
as axial ligands in addition to the vic-dioxime ligands. The uranyl complex has a 1:1 metal:ligand ratio and a dinuclear structure with μ-hydroxo bridges.
Received November 14, 2000. Accepted (revised) January 23, 2001 相似文献
5.
A novel hexadentate nitrogen donor [N6] macrocyclic ligand viz, 1,5,11,15,21,22-hexaaza-2,14-dimethyl-l4,12-diphenyltricyclo[15.3.1.I(7–11)]docosane[1,4,6,8,10(22)-11,14,16,18,20(21)]decaene
(L), has been synthesised. The Co (II), Ni (II), and Cu (II) complexes with this ligand have been prepared and subjected to
elemental analysis, molar conductance, magnetic susceptibility measurements, mass, 1H NMR (ligand), IR, electronic, and ESR spectral studies and electrochemical investigation. On the basis of molar conductance
the complexes can be formulated as [M(L)]X2 (where M = Co (II), Ni (II), Cu (II) and X = Cl− and NO3−) due to their 1: 2 electrolytic nature in DMSO. All the complexes are of the high-spin type and are six-coordinated. On the
basis of IR, electronic, and ESR spectral studies, an octahedral geometry has been assigned for the Co(II) and Ni(II) complexes,
whereas a tetragonal geometry for the Cu(II) complexes was found. Antimicrobial activity of L and its complexes as growth
inhibiting agents have been screened in vitro against two species (F. moniliformae and R. solani) of plant pathogenic fungi.
The text was submitted by the authors in English. 相似文献
6.
Subhi A. Al-Jibori Ali I. Abdullah Talal A. K. Al-Allaf 《Transition Metal Chemistry》2007,32(3):398-406
Palladium(II) and platinum(II) complexes containing mixed ligands N-(2-pyridyl)acetamide (AH) or N-(2-pyrimidyl)acetamide (BH) and the diphosphines Ph2P(CH2)
n
PPh2, (n = 1, 2 or 3) have been prepared. The prepared complexes [Pd(A)2(diphos)] or [Pd(B)2(diphos)] have been used effectively to prepare bimetallic complexes of the type [(diphos)Pd(μ-L)2M′Cl2] where M′ = Co, Cu, Mn, Ni, Pd, Pt or SnCl2; L = A or B. The prepared complexes were characterized by elemental analysis magnetic susceptibility, i.r. and UV–Vis spectral
data. 31P–{1H}-n.m.r. data have been applied to characterize the produced linkage isomers. 相似文献
7.
N. M. Logacheva V. E. Baulin E. N. Pyatova I. S. Ivanova A. Yu. Tsivadze 《Russian Journal of Coordination Chemistry》2009,35(9):648-656
Complexes of Co(II), Ni(II), Zn(II), and Cu(II) perchlorates and hexafluorophosphates with 4′-(4″-benzo-15-crown-5)oxy-2,2′:6′,2″-terpyridine
(L) [M(L)2](ClO4)2 · 3H2O and [M(L)2](PF6)2 · 2H2O were synthesized. The spectral criteria of ligand coordination through the terpyridine nitrogen atoms were established.
An assumption concerning the benzo-15-crown-5 conformation in the ligand molecule in the synthesized complexes was made. The
extraction and ion-selective properties of L were studied. 相似文献
8.
An interesting series of cobalt(II) complexes of the new ligands: 4[N-(benzalidene)amino]antipyrinethiosemicarbazone (BAAPTS), 4[N-(2′-hydroxy-benzalidene)amino]antipyrinethiosemicarbazone (HBAAPTS) and 4[N-(2′-hydroxy-1′-naphthalidene)amino]antipyrinethiosemicarbazone (HNAAPTS) were synthesized by reaction with Co(II) salts in
ethanol. The general stoichiometry of the complexes was found to be [CoX2(H2O)(L)] and [Co(L)2](ClO4)2, where X = Cl, NO3, NCS or CH3COO and L = BAAPTS, HBAAPTS or HNAAPTS. The complexes were characterized by elemental analysis, molar conductivity measurement,
molecular weight determination, magnetic moments at room temperature, infrared and electronic spectra. All the thiosemicarbazones
behave as neutral tridentate (N, N, S) donor ligands. The conductivity measurements in PhNO2 solution indicated that the chloro, nitrato, thiocyanato and acetate complexes are essentially non-electrolytes, while the
perchlorate complexes are 1:2 electrolytes. Thermogravimetric studies were performed for some representative complexes and
the decomposition mechanism proposed. Antibacterial and antifungal properties of the ligands and their cobalt(II) complexes
have also been examined and it has been observed that the complexes are more potent bactericides than the ligand. 相似文献
9.
Ding-Wa Zhang Zheng-Yin Yang Shi-Ping Zhang Ru-Dong Yang 《Transition Metal Chemistry》2006,31(3):333-336
A novel ligand (H2L), diethylenetriamine-N,N′,N′′-triacetylisoniazide N,N′′-bisacetic acid, and its four non-ion transition metal complexes,
ML · nH2O (M = Mn, n = 4; M = Co, Ni, n = 2; M = Cu, n = 1), have been synthesized and characterized on the basis of elemental analysis, molar conductivity, 1H-NMR, FAB-MS, TG-DTA analysis and IR spectrum. In addition, relaxivity (R1) of the complexes was determined, the relaxivity of MnL, CoL, NiL, CuL as well as Gd(DTPA)2− used as a control are 6.94, 2.79, 2.52, 1.59 and 4.34 l mmol−1 s−1, respectively. The relaxivity of MnL is larger than that of Gd(DTPA)2−. The results show that the complex of MnL may be a potential MRI contrast agent. 相似文献
10.
Complexes [Pd(bt)(4,4′-bpy)OOCCH3], [Pd(bt)NO3]2(m-4,4′-bpy), [Pd(bt)(m-4,4′-bpy)]4(NO3)4 (bt− is deprotonated form of 2-phenylbenzothiazole, bpy is 4,4′-bipyridyl) are prepared and characterized by 1H NMR, electron absorption and emission spectroscopy, as well as by voltammetry. The upfield shift of the signal of proton
in the ortho-position to the donor carbon atom of the cyclopalladated ligand in the complexes [(Δδ = −(1.1–1.5) ppm] is assigned to the
anisotropic effect of the ring current of the pyridine rings of the 4,4′-bipyridyl moiety, which are orthogonal to the coordination
plane. Characteristic longwave absorption bands λ = (387±4) nm and the low-temperature phosphorescence bands λ = (512±3) nm
in the complexes are assigned to the chromophore {Pd(bt)} metal complex fragment. The reduction waves in the complexes [E
1/2 = −(1.54±0.04) and E
p = −(1.83±0.03) V] are assigned to the ligand-centered processes of the successive electron transfer to the π* orbitals localized
predominantly on the coordinated pyridine components of the 4,4′-bipyridyl moiety. 相似文献