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1.
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
2.
The new Co(II), Cu(II), Ni(II) and Zn(II) complexes of potentially N2O2 Schiff base ligand [N,N’-bis(salicyldehydene)-1,4-bis-(o-aminophenoxy)butane] (H2L) prepared from 1,4-bis-(o-aminophenoxy)butane and salicyldehyde in DMF. Microanalytical data, elemental analysis, magnetic measurements, lH NMR, 13C NMR, UV-visible and IR spectra as well as conductance measurements were used to confirm the structures. In all complexes,
H2L behaves as a tetradentate.
The article is published in the original. 相似文献
3.
Viorel Cîrcu Ana S. Mocanu Constantin Roşu Doina Manaila-Maximean Florea Dumitraşcu 《Journal of Thermal Analysis and Calorimetry》2012,107(3):877-886
A series of ortho-metallated palladium(II) complexes with two dimeric liquid crystals Schiff base (methoxy and decyloxy as terminal groups)
as cyclometallated ligands and N-aryl-N′-benzoyl thiourea derivatives as co-ligands were prepared and investigated for their liquid crystalline properties. Their
structures were assigned based on elemental analysis, FT-IR and 1H NMR spectroscopy while the thermal behaviour was investigated by differential scanning calorimetry and polarising optical
microscopy. The complexes with Schiff base ligand bearing methoxy group as terminal group show extensive decomposition during
melting while the complexes with Schiff base having decyloxy group as terminal group show monotropic nematic phases, with
the mesophase stability strongly related to the type of N-aryl-N′-benzoyl thiourea derivative used. Their liquid crystalline properties are compared with their analogues having N,N-dialkyl-N′-benzoyl thiourea as co-ligands which were reported previously. One of the latter complexes was also investigated by thermally
stimulated depolarisation currents method while the optical transmission was recorded simultaneously. The thermally stimulated
depolarisation currents and optical transmission spectra confirmed the previous observation regarding the phase transition
temperatures. The current intensity–applied voltage dependencies of this complex were investigated by specific electrical
measurements. 相似文献
4.
A new vic-dioxime ligand, N,N′-bis(aminopyreneglyoxime) (LH2), and its copper(II), nickel(II) and cobalt(II) metal complexes were synthesized and characterized by elemental analyses,
IR, UVVIS and 1H and 13C NMR spectra (for the ligand). Mononuclear complexes were synthesized by a reaction of ligand (LH2) and salts of Co(II), Ni(II), and Cu(II) in ethanol. The complexes have the metal-ligand ratio of 1: 2 and metals are coordinated
by N,N′ atoms of vicinal dioximes. The ligand acts in a polydentate fashion bending through nitrogen atoms in the presence of a base,
as do most vic-dioximes. Detection of a H-bonding in the Co(II), Ni(II), and Cu(II) complexes by IR revealed the square-planar MN4 coordination of mononuclear complexes. Fluorescent properties of the ligand and its complexes arise from pyrene units conjugated
with a vic-dioxime moiety. Fluorescence emission spectra of the ligand showed a drastic decrease in its fluorescence intensity upon
metal binding. The electrochemical properties of the complexes were studied by the cyclic voltammetry technique. The nickel
complex displayed an irreversible oxidation process while the copper complex exhibited a quasi-reversible oxidation and reduction
processes based on the copper Cu(II)/Cu(III) and Cu(II)/Cu(I) couples, respectively. 相似文献
5.
A new ligand N′-(pyridin-2-ylmethylene)nicotinohydrazide (HL2) and two Ni(II) complexes of stoichiometry NiL1·H2O [L1-2-benzoylpyridine nicotinoylhydrazone] and NiL2·H2O have been synthesized and characterized by elemental analyses, IR and UV–Vis spectral studies. Structures of HL2 and Ni(II) compounds have been determined by single crystal X-ray diffraction studies which reveal a distorted octahedral
geometry around the two Ni(II) centers.
Graphical abstract A new ligand N¢-(pyridin-2-ylmethylene)nicotinohydrazide (HL2) and two Ni(II) complexes of stoichiometry NiL1·H2O [L1-2-benzoylpyridine nicotinoylhydrazone] and NiL2·H2O have been synthesized and characterized by elemental analyses, IR, UV–Vis spectral studies and single crystal X-ray analysis.相似文献
6.
o-Hydroxyacetophenone (N-benzoyl)glycyl hydrazone (o-HABzGH) forms complexes of the types [M(o-HABzGH)Cl2(H2O)2]Cl and [M(o-HABzGH-2H)OH(H2O)2], where M = Y(III), Gd(III), Tb(III) and Dy(III). The complexes have been characterized by elemental analyses, molar conductance,
magnetic susceptibility, infrared, electronic,1H NMR and13C NMR spectral techniques. The nephelauxetic ratio (β), covalency (δ), bonding parameter (b
1/2) and angular overlap parameter (η) have been calculated from Dy(III) complexes. Infrared and NMR spectral studies show thato-HABzGH acts as a neutral bidentate ligand in the adduct complexes and as a dinegative tridentate one in the neutral complexes.
A coordination number of six has been proposed for the metal ion in all the complexes. 相似文献
7.
Summary A reversed-phase ion-pair chromatographic (RPIPC) method withN,N,N′, N′-ethylenediaminetetrakis(methylenephosphonic acid) (EDTMP) as coordinating agent has been developed for simultaneous separation
and detection of Cu(II), Fe(III), and Pb(II) ions. Response is linearly dependent on amount of sample over the range 9.52–50.8
μg mL−1 for Cu(II), 8.31–41.8 μg mL−1 for Fe(III), and 37.3–51.8 μg mL−1 for Pb(II). The method has been applied successfully to an artificial mixed-ore sample. 相似文献
8.
The tripodal ligand N,N′,N″-tri(benzimidazolyl)-methane has been used to synthesize nickel(II) complexes along with an exogeneous
ligand, X(X = Cr−,NO
3
−
,ClO
4
−
, HCOO−, OAc− and CNS−). Electronic absorption spectra reveal that the present nickel(II) complexes have six coordinate tetragonal geometries. The
value of Racah parameter(B), crystal field splitting parameter (Dq) and term,β0 (which is a measure of covalency) have been calculated.1HNMR spectroscopy reveals a dominantσ-delocalization pattern in these complexes. 相似文献
9.
Ali M. Ali Ayman H. Ahmed Tarek A. Mohamed Bassem H. Mohamed 《Transition Metal Chemistry》2007,32(4):461-467
New copper(II), nickel(II), iron(III) and palladium(II) Schiff base complexes derived from o-tolidine and selected aldehydes, namely salicyaldehyde and 2-hydroxynaphthaldehyde have been synthesized and characterized
by a combination of elemental analyses, magnetic moments, spectral (u.v.–vis., i.r.) and thermal (tg, dtg) mesurements. The
corrosion inhibition of aluminium and copper in 1 M HCl and chromium–nickel steel in crude oil using N,N′bis(salicyledene)-o-tolidine have been studied by weight loss method. 相似文献
10.
I. Labádi R. Tudose I. Fejér Z. Jóri O. Costisor 《Journal of Thermal Analysis and Calorimetry》1999,56(2):553-559
Parent and mixed ligand complexes of cobalt and copper with antipyrine derivatives of 1,2-ethanediamine or piperazine and
with 2-aminobenzothiazole (TAB) were synthesized and their thermal behaviour was investigated. The complexes contain N,N′-bis(4-antipyrylmethyl)-piperazine
(BAMP) or N,N′-tetra(4-antipyrylmethyl)-1,2-diaminoethane (TAMEN) or/and TAB as ligand, and Cl−, ClO4
− or SCN−. The complexes decompose with the evolution of heat. The decomposition route depends on the presence of ClO4
−. If the ClO4
− is not coordinated, it oxidizes the TAB and BAMP or TAMEN and the decomposition is explosive.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献