排序方式: 共有49条查询结果,搜索用时 15 毫秒
31.
Ghobad Mansouri Hassan Hadadzadeh Hamid Reza Khavasi 《Journal of organometallic chemistry》2007,692(17):3810-3815
The novel cyclometalated Rh(III) complex, [Rh(phpy-κ2N,C2′)2(phen-dione)]PF6, where phpy-κ2N,C2′ is pyridine-2-yl-2-phenyl and phen-dione is 1,10-phenanthroline-5,6-dione has been prepared and characterized by elemental analysis, IR, 1H NMR, and electronic absorption spectroscopies, cyclic voltammetry, and X-ray crystallography. The crystal structure of [Rh(phpy-κ2N,C2′)2(phen-dione)]PF6·CH3CN shows that the coordination geometry around the Rh(III) is a distorted octahedron, with bite angles of 76.13°-81.09° for all three bidentate ligands. 相似文献
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Two novel, mixed ligand complexes of cobalt(III) and nickel(II), [Co(phen)2(taptp)]3+ (1) and [Ni(phen)2(taptp)]2+ (2) (phen = 1,10-phenanthroline and taptp = 4,5,9,18-tetraazaphenanthreno [9,10-b]triphenylene), were synthesized and characterized by elemental analyses, UV-visible and NMR spectroscopies. The binding interactions of the two complexes with DNA have been investigated using absorption and emission spectroscopy methods and electrophoresis measurement mode. The intrinsic binding constants for these complexes to DNA are in the order of 105. In Tris buffer, the Co(III) complex shows a moderate luminescence which was enhanced after binding to DNA. However for complex Ni(II), no emission was observed in Tris buffer. The [Co(phen)2(taptp)]3+ and [Ni(phen)2(taptp)]2+ can cause the photocleavage of DNA supercoiled pBR322 upon irradiation by 360 nm light. Based on the data, an intercalative mode of DNA binding is suggested for the two complexes. 相似文献
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A hydrogen ion-selective poly(vinyl chloride) (PVC) membrane electrode was developed using 2-(4-methoxy phenyl) 6-(4-nitrophenyl)-4-phenyl-1,3-diazabicyclo [3.1.0] hex-3-ene as ionophore. Effects of experimental parameters such as membrane composition, nature and amount of plasticizer, and the amount of additive on the potential response of pH sensor were investigated. This H+-selective membrane electrode gave a linear response over the pH range 0-4 (10−4 to 1 mol L−1 HCl) with slope of 57.4 ± 0.3 mV pH−1 and limit of detection 6.3 × 10−5 mol L−1 at 20 °C. Also, hydrofluoric acid did not influence the surface of this electrode and thus it was maintained without showing any changes in potentials after being used in a hydrofluoric acid solution. The equilibrium water content of the electrode was determined in the presence of two different plasticizers as membrane solvent. The alkaline cation binding affinity of ionophore was very low that prove these cations do not have specific interaction with this ionophore. The electrode had fairly low electrical resistance, good potential stability and reproducibility. It has a rapid potential response to changes of pH (10 s), easily used in a single channel wall-jet flow injection system with good reproducibility (RSD% = 1.67%) and high reversibility. It was used as indicator electrode in potentiometric determination of pH in real samples. 相似文献
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Ali Taherkhani Tahoora Jamali Hassan Hadadzadeh Hassan Karimi-Maleh Hadi Beitollahi Mehdi Taghavi Fatemeh Karimi 《Ionics》2014,20(3):421-429
In this work, a ZnO/nanoparticles (NPs) modified carbon ionic liquid paste electrode (ZnO/NP/CILPE) was fabricated and used to investigate the electrochemical behavior of folic acid. ZnO/NP/CILPE was prepared by mixing hydrophilic ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([C4mim]-[PF6])), ZnO/NPs, graphite powder, and liquid paraffin together. The fabricated ZnO/NP/CILPE showed great electrocatalytic ability to the oxidation of folic acid, and an irreversible oxidation peak appeared at 0.75 V (vs. Ag/AgCl) with improved peak current. Under the optimized conditions of pH 9.0, the plot of peak current vs. folic acid concentration consisted of two linear segments with slopes of 1.776and 0.033 μA/μM in the concentration ranges of 0.05–1.5 μM and 1.5–550.0 μM, respectively. The detection limit was 0.01 μM (3σ). The proposed sensor was successfully applied for the determination of folic acid in fortified food and pharmaceutical samples. 相似文献
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Hassan Hadadzadeh Ali R. Rezvani Francine Belanger-Gariepy 《Journal of Molecular Structure》2005,740(1-3):165-168
Several new RhIII complexes, [Rh(tpy)(bpy)L](PF6)2 (tpy=2,2′:6′,2″-terpyridine, bpy=2,2′-bipyridine, and L=monoanions of phenylcyanamide(pcyd)), 4-methylphenylcyanamide (4-MePcyd), 2,4-dimethylphenylcyanamide (2,4-Me2pcyd), 4-methoxyphenylcyanamide (4-MeOPcyd), 2-chlorophenylcyanamide (2-Clpcyd) and 2,5-dichlorophenylcyanamide (2,5-Cl2pcyd) have been synthesized and characterized by elemental analysis, IR, 1H NMR and electronic absorption spectroscopies. ORTEP drawing of [Rh(tpy)(bpy)(2,5-Cl2pcyd)](PF6)2·1/2CH3CN shows three pyridyl rings of the tpy ligand that are nearly coplanar, as are the two rings of bpy. The anionic cyanamide group is coordinated end-on by the nitrile nitrogen to the RhIII. The RhIII–NCN bond is bent, having an angle of 125.4°. This bent bond is largely determined by the σ-bonding interaction of a cyanamide non-bonding electron pair in a sp2 hybrid orbital. 相似文献
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Marzieh Daryanavard Hassan Hadadzadeh Aliakbar Dehno Khalaji Matthias Weil 《Transition Metal Chemistry》2009,34(7):779-786
The mononuclear Ru(III) complex, [Ru(bpy)(tppz)Cl][PF6]2.acetylacetone, where tppz is 2,3,5,6-tetrakis(2-pyridyl)pyrazine and bpy is 2,2′-bipyridine, has been prepared and characterized
by physicochemical and spectroscopic methods, cyclic voltammetry, and single crystal X-ray structure analysis. The coordination
around the Ru(III) center is distorted octahedral, with bite angles of 80.70–161.83° for the chelating bpy and tppz ligands.
The two pyridyl rings of the bpy ligand are nearly coplanar. UV–vis spectroelectrochemical studies of this complex in acetonitrile
showed a reversible redox behavior evaluated by the maintenance of isosbestic points in the UV–vis spectrum for both forward
reduction and reverse oxidation processes. Magnetic susceptibility data derived from paramagnetic NMR data revealed an effective
magnetic moment of 1.79 BM at room temperature. 相似文献
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Synthesis of 1‐(Cyclohexylamino)‐2‐(aryl)pyrrolo[1,2‐a]quinoline‐3‐carbonitrile Derivatives Using a Mild,Four‐Component Reaction 下载免费PDF全文
Malek Taher Maghsoodlou Nourallah Hazeri Khatereh Khandan‐Barani Sayyed Mostafa Habibi‐Khorasani Alireza Abedi 《Journal of heterocyclic chemistry》2014,51(Z1):E152-E155
1‐(Cyclohexylamino)‐2‐(aryl)pyrrolo[1,2‐a]quinoline‐3‐carbonitrile derivatives were synthesized in an efficient method from four‐component condensation reaction between cyclohexyl isocyanide, quinoline, malononitrile, and aromatic aldehydes in the presence of a catalytic amount of titanium dioxide (TiO2) in CH2Cl2 at ambient temperature in good yields. Silica gel column chromatography was employed for HCN elimination and then 1, 3 hydrogen shift was led to form final products 5a , 5b , 5c , 5d , 5e . 相似文献