共查询到20条相似文献,搜索用时 0 毫秒
1.
《Journal of Coordination Chemistry》2012,65(13):2321-2328
A ruthenium(III) complex containing ethylenediaminetetraacetate (edta), [{Ru(Hedta)}2(Pyz)]?·?8H2O (1) (Pyz?=?pyrazine), has been synthesized by the reaction between K[Ru(Hedta)Cl]?·?1.5H2O and pyrazine. The structure of the complex was determined by single X-ray diffraction. Complex 1 crystallizes in the triclinic space group P 1 with a?=?7.293(9)?Å, b?=?10.575(14)?Å, c?=?12.742(16)?Å, α?=?104.044(19)°, β?=?91.893(19)°, γ?=?93.35(2)°, Z?=?1. The product was also characterized by IR, UV-Vis, EPR spectrum and magnetic techniques. 相似文献
2.
《Journal of Coordination Chemistry》2012,65(6):943-953
Coordination chemistry of cyanoximes–low molecular weight organic molecules having general formula NC–C(=NOH)–R–received attention in recent years due to their pronounced biological activity and interesting properties. The preparation, spectroscopic properties, electrochemical properties, and crystal structure of the first representative of a family of cobalt(III) tris-cyanoximates–Co(BCO)3 (where BCO is the anion of the benzoylcyanoxime, C6H5–C(O)–C(NO)–CN–)–are now reported. The complex crystallizes as red prisms from CHCl3 solution as the fac-isomer in centrosymmetric R3 space group with three pairs of enantiomers in the unit cell (Z = 6). Slow evaporation of CH3CN solution of Co(BCO)3 leads to crystallization of the same fac-complex without a solvent molecule in the lattice, only this time in the centrosymmetric monoclinic C2/c space group (Z = 8). Both structures have converged with final values R 1 = 0.0462 (wR 2 = 0.1273) and R 1 = 0.0323 (wR 2 = 0.0809), respectively. Therefore, two polymorphs of Co(BCO)3 were observed, which is a rare case for this transition metal in Werner-type complexes. The cyanoxime anion forms a five-membered chelate ring by the nitrogen of the nitroso and the oxygen of the carbonyl, and the ligand adopts cis-anti configuration. The anion is bound to the metal center via short, covalent Co–N and Co–O bonds, and represents the second known case of very tight binding of an oxime ligand to Co(III). There is a significant degree of ligand-to-metal charge transfer reflected in an unusually low value of the redox potential Co(III) + e = Co(II) (E 1/2 = ?0.0975 V) as opposed to that tabulated for aqueous solutions +1.82 V, and low-field shifts of the positions of the signals in 13C NMR spectrum of fac-Co(BCO)3 compared to the free ligand. 相似文献
3.
《Journal of Coordination Chemistry》2012,65(19):3158-3171
Bis(2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone(naohH4) interacts with manganese(II) acetate in methanol followed by addition of KOH giving [MnIV(naoh)(H2O)2]. Activated ruthenium(III) chloride reacts with naohH4 in methanol yielding [RuIII(naohH4)Cl(H2O)Cl2]. The replacement of aquo by heterocyclic nitrogen donor in these complexes has been observed when the reaction is carried out in presence of heterocyclic nitrogen donors such as pyridine(py), 3-picoline(3-pic) or 4-picoline(4-pic). The molar conductance values in DMF for these complexes suggest non-electrolytic nature. Magnetic moment values suggest +4 oxidation state for manganese in its complexes, however, ruthenium(III) complexes are paramagnetic with one unpaired electron. Electronic spectral studies suggest six coordinate metal ions. IR spectra reveal that naohH4 coordinates in enol-form and keto-form to manganese and ruthenium, respectively. ESR and cyclic voltammetric studies of the complexes have also been reported. 相似文献
4.
《Journal of Coordination Chemistry》2012,65(10):1677-1689
Reaction of 2-hydroxy-1-naphthaldehydebenzoylhydrazone(napbhH2) with manganese(II) acetate tetrahydrate and manganese(III) acetate dihydrate in methanol followed by addition of methanolic KOH in molar ratio (2 : 1 : 10) results in [Mn(IV)(napbh)2] and [Mn(III)(napbh)(OH)(H2O)], respectively. Activated ruthenium(III) chloride reacts with napbhH2 in methanolic medium yielding [Ru(III)(napbhH)Cl(H2O)]Cl. Replacement of aquo ligand by heterocyclic nitrogen donor in this complex has been observed when the reaction is carried out in presence of pyridine(py), 3-picoline(3-pic) or 4-picoline(4-pic). The molar conductance values in DMF (N,N-dimethyl formamide) of these complexes suggest non-electrolytic and 1 : 1 electrolytic nature for manganese and ruthenium complexes, respectively. Magnetic moment values of manganese complexes suggest Mn(III) and Mn(IV), however, ruthenium complexes are paramagnetic with one unpaired electron suggesting Ru(III). Electronic spectral studies suggest six coordinate metal ions in these complexes. IR spectra reveal that napbhH2 coordinates in enol-form and keto-form to manganese and ruthenium metal ions in its complexes, respectively. ESR studies of the complexes are also reported. 相似文献
5.
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
6.
Olga Impert Grzegorz Wrzeszcz Tadeusz Muzioł Katarzyna Hrynkiewicz Natalia Olejnik 《Journal of Coordination Chemistry》2016,69(14):2107-2120
Three water-soluble ruthenium(III) compounds, Y[cis-RuCl2(pic)2]?nH2O (where pic = picolinate anion, Y = H(Hpic)2+ (1), H2pic+ (2) or K+ (3), n = 2, 1.5, and 2.5, respectively), were synthesized and their X-ray structures determined. Compound 1 was fully characterized both as solid and in aqueous solution by elemental analysis, magnetic susceptibility measurements, EPR, IR and UV-visible spectroscopy, cyclic voltammetry, microwave plasma atomic emission, and mass spectrometry, capillary electrophoresis and chromatographic methods. It was shown that the coordination geometry around the low spin (S = ½) RuIII center is distorted octahedral with the chlorido ligands in a cis configuration. Furthermore, all the measurements showed that the structures in the solid state and solution are absolutely identical with the cis-[RuCl2(pic)2]? anion being inert in aqueous solution. Microbial studies showed that 1 exerts a strong inhibition on the growth and increased mortality level of the bacterial strains – Escherichia coli, Pseudomonas sp., Sarcina sp., Micrococcus sp., Serratia sp., Bacillus cereus, Bacillus subtilis and yeast – Saccharomyces cerevisiae. 相似文献
7.
El-Sayed A.K. Yacoub Abdel-Ghany El-Kourashy M.A. Al-Hajjaji 《Arabian Journal of Chemistry》2013,6(1):111-114
2,4,6-Tri(2′-pyridyl)-s-triazine (TPTZ) complexes with iron(II) and ruthenium(III) were prepared. Their sorption and desorption features on silica gel have been investigated. Both complexes were strongly adsorbed. This has been utilized for separating and preconcentrating iron(II) and ruthenium(III) using TPTZ-impregnated silica gel. The chromatographic behavior of TPTZ on silica gel column was examined and found to be effective modifier for silica gel surface. The sorption capacity of silica gel for those metal-triazine complexes has been determined under static conditions and was found to be 5.28 × 10–3 mM (Fe(TPTZ)22+) and 2.9 × 10–3 mM (Ru(TPTZ)23+). Saturated methanolic solutions of KI or 25% NaClO4 solutions desorbed both complexes quantitatively from the silica gel surface. 相似文献
8.
《Journal of Coordination Chemistry》2012,65(21):3833-3848
Ruthenium(III) complexes of the type [RuX(EPh3)(L)2] (X?=?Cl or Br; E?=?P or As; L?=?2-hydroxychalcone) have been prepared by reacting [RuX3(EPh3)3] with 2-hydroxychalcones in benzene under reflux. The new complexes have been characterized by analytical and spectroscopic (infrared, electronic, electron paramagnetic resonance, and mass) methods. Redox potential studies of the complexes have been carried out to elucidate the electronic structure, geometry, and electrochemical features. On the basis of data obtained, an octahedral structure has been assigned for all the complexes. The new complexes exhibit catalytic activity for the oxidation of primary and secondary alcohols into their corresponding aldehydes and ketones in the presence of N-methylmorpholine-N-oxide as co-oxidant and they were also found to be efficient catalyst for the transfer hydrogenation of ketones. 相似文献
9.
10.
《Journal of Coordination Chemistry》2012,65(22):4082-4101
A new gadolinium(III) complex of 5-aminoorotic acid (HAOA) was synthesized by reaction of the respective inorganic salt in molar ratio of 1:3 to ligand. The structure of the complex was determined by elemental analysis, FT-IR, and FT-Raman spectroscopies. Significant differences in the IR and Raman spectra of the complex were observed as compared to the spectra of the free ligand. Detailed vibrational analysis of HAOA and Gd(III)-AOA systems revealed that the binding mode in the complex was bidentate through the carboxylic oxygens. The newly synthesized gadolinium(III) complex of 5-aminoorotic acid (GdAOA) showed antioxidant properties. The antioxidant activity of both HAOA and GdAOA was related with their electron donor properties. 相似文献
11.
《Journal of Saudi Chemical Society》2020,24(8):584-605
A europium salt-Na[Eu(5,5′-DMBP)(phen)3]·Cl3 (Eu(III)-CPLx) was prepared by using various precursors such as 5,5′-Dimethyl-2,2′-bipyridyl (5,5′-DMBP), 1,10-phenanthroline (phen) and europium chloride hexahydrate (EuCl3·6H2O) by a complexation method. The red emission fluorescent Na[Eu(5,5′-DMBP)(phen)3]·Cl3/D-Dextrose (Eu(III)-CPLx/D-Dex) composite was synthesized by using an adsorption method with Eu(III)-CPLx and D-Dextrose (D-Dex). The Eu(III)-CPLx and fluorescent (Eu(III)-CPLx/D-Dex) composites were characterized by numerous techniques. The fluorescent (Eu(III)-CPLx/D-Dex) composite demonstrated a strong red emission and controlled fluorescence quenching in the solid state and was consequently used in latent fingerprint (LFP) detection. The LFPs were developed by using a powder dusting method (PDM) with Eu(III)-CPLx and fluorescent Eu(III)-CPLx/D-Dex composites on different substrates under daylight and UV-light irradiation at 365 nm. The fluorescent Eu(III)-CPLx/D-Dex composite was effectively explored for developing LFP images on various substrates and also acts as a better labeling agent for LFP detection in forensic science crime scene investigations. 相似文献
12.
Synthesis,characterization, and antibacterial activity of a manganese(II) complex of triaryltriazole
《Journal of Coordination Chemistry》2012,65(9):1602-1607
A manganese(II) complex of 4-(4-methylphenyl)-3,5-bis(2-pyridyl)-4H-1,2,4-triazole (MBPT) was synthesized and characterized by X-ray crystallography. [Mn(MBPT)2(H2O)2](ClO4)2?·?4H2O is a divalent mononuclear manganese(II) complex with manganese coordinated to four nitrogens from two triazole ligands and two oxygens from two water molecules in a slightly distorted octahedral geometry. The complex and ligand were tested in vitro for their antibacterial activities. The title complex showed a wide range of bactericidal activities. 相似文献
13.
The ruthenium(III) complex bearing benzo[h]quinoline as a cyclometalated ligand was synthesized and characterized by ESI-MS, elemental analysis, cyclic voltammetry and crystallography. The complex serves as an efficient catalyst for the aerobic oxidative dehydrogenation of benzylamines to the corresponding benzonitriles under mild conditions. 相似文献
14.
New azido-bridged [MnIII(salabza)(μ-1,3-N3)]n (1), and [CuII4(salabza)2(μ-1,1-N3)2(N3)2(HOCH3)2],(2) complexes with an unsymmetrical Schiff base ligand, {H2salabza = N,N’-bis(salicylidene)-2-aminobenzylamine}, have been synthesized, characterized by spectroscopic and electrochemical methods, and their crystal structures have been determined by X-ray diffraction. In complex 1, each manganese(III) atom is coordinated with N2O2 donor atoms from salabza and two adjacent Mn(III) centers are linked by an end-to-end (EE) azide bridge to form a helical polymeric chain with octahedral geometry around the Mn(III) centers. Complex 2 is a centrosymmetric tetranuclear compound containing two types of Cu(II) centers with square pyramidal geometry. Each terminal copper atom is surrounded by N2O2 atoms of a salabza ligand, and the oxygen atom of the methanol molecule. Each central copper(II) ion is coordinated with two phenoxo oxygen atoms from one salabza, one terminal azido, and two end-on (EO) bridging azido ligands. The central copper(II) ions are linked to each other by the two end-on (EO) azido groups. 相似文献
15.
Jiyong Deng Yu Liu Yafei Wang Hua Tan Zhiyong Zhang Gangtie Lei Junting Yu Meixiang Zhu Weiguo Zhu Yong Cao 《European Polymer Journal》2011,(9):1836-1841
A series of fluorene-alt-oxadiazole copolymers containing a pendent phosphor chromophore of the (piq)2Ir(pic) complex were synthesized via the palladium-catalyzed Suzuki coupling reaction, where piq is 1-phenylisoquinoline and pic is picolinic acid. These copolymers exhibited a similar absorption spectrum with a peak at about 330 nm and a typical emission peak at 408 nm in CH2Cl2 from the fluorene-alt-oxadiazole backbone. However, a significantly red-shifted emission peak at about 625 nm was observed in the neat films of these copolymers, which are attributed to the pendent iridium (III) complex unit. Using these copolymers as single emission layer, the polymer light-emitting devices with a configuration of ITO/PEDOT:PSS/copolymers/LiF/Al exhibited a saturated red emission with a peak at 632 nm. Significant influence of the attached iridium (III) complex ratio on EL performance was presented. A maximum current efficiency of 1.2 cd/A at 63 mA/cm2 and a maximum luminance of 1125 cd/m2 at 12 V were achieved from the device with the copolymer containing iridium (III) complex in a 3% molar ratio. 相似文献
16.
M. Helena Garcia Pedro Florindo M. Teresa Duarte Etienne Goovaerts 《Journal of organometallic chemistry》2009,694(3):433-274
A new family of three-legged piano stool structured organometallic compounds containing the η5-cyclopentadienylruthenium(II)/iron(II) fragments {M(η5-C5H5) (DPPE)}+, {Ru(η5-C5H5)(PPh3)2}+ and {Ru(η5-C5H5)(TMEDA)}+ with coordinated thiophene based chromophores, namely 5-(2-thiophen-2-yl-vinyl)-thiophene-2-carbonitrile (L1) and 5-[2-(5-Nitro-thiophen-2-yl)-vinyl]-thiophene-2-carbonitrile (L2) has been synthesized and fully characterized by 1H, 13C, 31P NMR, IR and UV-Vis spectroscopies. Also, electrochemical studies were carried out by cyclic voltammetry and all experimental data are interpreted and compared with related compounds under the scope of NLO properties. Compounds [Ru(η5-C5H5)(DPPE)(NC(C4H2S)C(H)C(H)(C4H3S))][CF3SO3] (1′Ru) [Fe(η5-C5H5)(DPPE)(NC(C4H2S)C(H)C(H)(C4H3S))] [PF6] (1Fe) and [Ru(η5-C5H5)(DPPE)(NC(C4H2S)C(H)C(H)(C4H2S)NO2)][CF3SO3] (4′Ru) were also crystallographically characterized. 相似文献
17.
Xiao-Long Zhao Hua-Qian Zhao Xue-Xue Xu Zhen-Sheng Li Ke-Zhi Wang 《Journal of Coordination Chemistry》2017,70(12):2094-2112
G-quadruplex structures are attractive targets for the development of anticancer drugs, as their formation in human telomere could impair telomerase activity, thus inducing apoptosis in cancer cells. In this work, a thiophene-containing dinuclear ruthenium(II) complex, [Ru2(bpy)4(H2bipt)]4+ {bpy = 2,2′-bipyridine, H2bipt = 2,5-bis[1,10]phenanthrolin[4,5-f]-(imidazol-2-yl)thiophene}, was prepared and the interaction between the complex and human telomeric DNA oligomers 5′-G3(T2AG3)3-3′ (HTG21) has been investigated by UV-Vis, fluorescence and circular dichroism (CD) spectroscopy, fluorescence resonance energy transfer (FRET) melting assay, polymerase chain reaction (PCR) stop assay, fluorescent intercalator displacement (FID) titrations, Job plot and color reaction studies. The results indicate that the complex can well induce and stabilize the formation of antiparallel G-quadruplex of telomeric DNA in the presence or absence of metal cations, and the ΔTm value of the G-quadruplex DNA treated with the complex was obtained to be 12.8 °C even at levels of 50-fold molar of duplex DNA (calf-thymus DNA), suggesting that the complex exhibits higher G-quadruplex DNA selectivity over duplex DNA. The complex shows high interaction ability with G-quadruplex DNA at (1.17 ± 0.12) × 107 M?1 binding affinity using a 2:1 [complex]/[quadruplex] binding mode ratio. A novel visual method has been developed here for making a distinction between G-quadruplex DNA and duplex DNA by our ruthenium complex binding hemin to form the hemin-G-quadruplex DNAzyme. 相似文献
18.
Synthesis,spectral characterization and anticancer studies of three novel ruthenium(III) 2,2′‐bipyridine complexes
下载免费PDF全文
![点击此处可从《应用有机金属化学》网站下载免费的PDF全文](/ch/ext_images/free.gif)
A series of three new ruthenium(III) bipyridine complexes, [RuCl3(bipy)L] (L = C6H5CHO (Ru1), 4‐CH3OC6H4CHO (Ru2) and 4‐NO2C6H4CHO (Ru3); bipy = 2,2′‐bipyridine), have been synthesized and characterized using microanalysis, magnetic, spectroscopic (IR, UV–visible, electron spin resonance) and cyclic voltammetric techniques. All the ruthenium(III) complexes were found to be stable, paramagnetic and octahedrally coordinated. Electron spin resonance spectra showed an axial symmetry and indicated a tetragonal distortion for the octahedral complexes. All complexes were tested for their cytotoxicities against Ehrlich ascites carcinoma (EAC), superoxide dismutase‐like activities and cytoprotective effects of normal human red blood cells against photo‐irradiation. All the compounds were found to be cytotoxic with half maximal inhibitory concentration (IC50) against EAC at concentrations of 70, 90 and 76 µg for Ru1, Ru2 and Ru3, respectively. Moreover, mean levels of DNA and RNA were significantly elevated in liver tissues of tumorized animals and significantly reduced after treatment of tumorized mice with the complexes. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
19.
A mononuclear ruthenium complex [Ru(bpy)2(bpp)](PF6) (1) and its halogenated and nitro derivatives [Ru(bpy)2(Xbpp)](PF6) (bpy = 2,2′-bipyridine; bpp = 3,5-bis(2-pyridyl)pyrazole; X = Cl, 2; X = Br, 3; X = I, 4; X = NO2, 5) have been synthesized and characterized by 1H NMR, 13C NMR, HRMS, elemental analysis. Complexes 2–5 have been further confirmed by X-ray diffraction. Their UV–Vis and emission spectroscopies, electrochemical measurements and acid–base properties are described. The results presented here reveal that the introduction of Cl, Br, I and NO2 groups to the coordinated bpp− ligand makes the absorption and emission maxima of the parent complex 1 blue-shifted, the oxidation potential of the RuII/RuIII couple increased and the pKa value decreased obviously. In addition, significant quenching of the emission by these groups is also observed. 相似文献
20.
《Journal of Coordination Chemistry》2012,65(24):4292-4303
N,N′-bis((2-hydroxyphenyl)(phenyl)methylidene)propane-1,2-diaminato-N,N′,O,O′)-(nitrato-O)-manganese(III) methanol solvate ([Mn(C29H24N2O2)(NO3)CH3OH]) was synthesized and characterized by FTIR, UV–Vis, TG–FTIR, TG/DSC, molar conductivity, magnetic moment measurement and single crystal X-ray analysis. In the structure, the Mn(III) ion adopts a distorted octahedral geometry with two nitrogen and two oxygen atoms from the Schiff base ligand in the equatorial plane, and the nitrate ion and methanol molecule in the axial position. The effects of organic solvents of various polarities on the UV–Vis spectra of the ligand and complex were investigated. The manganese(III) complex is easily dissolved in organic polar aprotic solvents and has moderate solubility in organic polar protic solvents. 相似文献