共查询到20条相似文献,搜索用时 0 毫秒
1.
2.
《Journal of Saudi Chemical Society》2019,23(7):781-794
A new bioactive material of cobalt(II) with 5,10,15,20-tetrakis[4 (benzoyloxy)phenyl] porphyrin (TPBP) and bpy ligands ([CoII(TPBP)(bpy)2] 1) has been synthesized and characterized by Single-crystal X-ray diffraction (SCXRD), spectroscopic methods and quantum-chemistry calculations. In the crystalline structures of six coordinated Co(II) [CoII(TPBP)(bpy)2] 1, linear 1D polymeric chains were observed in which all the porphyrin units are aligned parallel to each other. The crystal packing is stabilized by inter-and intramolecular C–H⋯O and C–H⋯N hydrogen bonds, and by weak C–H⋯Cg π interactions. Interestingly, NBO–Second-order perturbation theory analysis, carried out at the UB3LYP/6-31G(d)/SDD DFT level of theory, demonstrated that a two-center bond between the nitrogen atoms and the cobalt ions (Co) was not found, the Co–Npy/bp interactions are coming from an electronic delocalization between the Npy/Nbp filled orbitals to the anti-bonding LP*(4) and LP*(5) metal NBOs. Mass spectroscopy, and elemental analysis were also investigated to confirm the molecular structure. The downfield shift and the peak broadening of the axial ligand resonances observed in the 1H NMR indicated the contiguity to the paramagnetic Co(II) center. Additionally, the photophysical properties have been evaluated by UV–visible absorption, and fluorescence emission spectroscopies. Finally, bioactivity investigations revealed that free porphyrin TPBP, CoIITPBP and complex 1 could be used as potential antioxidant agents. 相似文献
3.
Transition Metal Chemistry - The Fe(III) complex [FeIII(bpdc)(Hbpdc)] (1) (bpdc?=?2,2′-bipyridyl-6,6′-dicarboxylate and... 相似文献
4.
L. A. Glinskaya R. F. Klevtsova T. G. Leonova S. V. Larionov 《Journal of Structural Chemistry》2000,41(1):161-165
While seeking molecular precursors for ZnS films obtained by gas phase chemical deposition [1, 2] we synthesized mixed-ligand
compounds ZnL(ROCS2)2 [R = i-Pr. /-Bu; L = 2,2′-bipyridyl (2,2′-Bipy), 1,10-phenanthroline (Phen)] [3]. The volatile complex Zn(2,2′-Bipy)(i-PrOCS2)2 was used as a precursor to obtain electroluminescent ZnS:Mn films [4]. According to XRD data, the compound Zn(Phen)(i-BuOCS2)2 is monomeric. The c.n. of zinc is six. The Phen and 1-B11OCS2 ions behave as cyclic bidentate ligands [3, 5]. It was assumed that other mixed-ligand complexes with Phen and 2,2′-Bipy
have an analogous structure [3]. Here we report on the structure of the known mixed-ligand complex of zinc(II) ethylxanthate
with 2,2′-bipyridyl [6, 7]. It was found that the behavior of alkylxanthate ligands in mixed-ligand complexes of zinc(II)
is more complex.
Translated from Zhumal Stmktumoi Khimii, Vol. 41, No. 1, pp. 196-201, January–February, 2000. 相似文献
5.
R. T. Kuznetsova G. V. Maier O. O. Sikorskaya I. N. Lapin V. A. Svetlichnyi L. A. Antina G. B. Guseva 《High Energy Chemistry》2012,46(2):122-126
Spectra of nonstationary transient absorption of metal bis(dipyrrolylmethene) complexes in cyclohexane and ethanol, which
exhibit different photophysical and photochemical properties in these solvents, have been measured and the yields of excited
triplet states have been evaluated. It has been shown that the yield of triplets is determined by the intramolecular structure
and the difference in fluorescence and phototransformation yields is due to intermolecular interaction of the excited molecules
with the solvation shell. 相似文献
6.
Zhi-Min Wang Su-Mei Shen Xiu-Yin Shen Ya-Qin Xu Ai-Quan Jia 《Journal of Coordination Chemistry》2016,69(5):851-861
Five substituted-2,2′-bipyridine ligands L, (4-(p-methylphenyl)-6-phenyl-2,2′-bipyridine (L1), 4-(p-bromophenyl)-6-(p-bromophenyl)-2,2′-bipyridine (L2), 4-(p-bromophenyl)-6-phenyl-2,2′-bipyridine (L3), 4-phenyl-6-(p-bromophenyl)-2,2′-bipyridine (L4), and 4-(p-fluorophenyl)-6-(p-fluorophenyl)-2,2′-bipyridine (L5) were synthesized by stepwise formation. Reaction of cis-[RuCl2(bpy)2]?2H2O or cis-[RuCl2(phen)2]?2H2O and the substituted-2,2′-bipyridine ligands in the presence of KPF6 afforded the corresponding cationic polypyridine-ruthenium complexes of the type [(bpy)2Ru(L)](PF6)2 (bpy = 2,2′-bipyridine, 1–5) or [(phen)2Ru(L)](PF6)2 (phen = 1,10-phenanthroline, 6–10), respectively. All complexes have been spectroscopically characterized by UV–vis, luminescence, and electrogenerated chemiluminescence. The structures of 1?CH3COCH3, 3?CH3COCH3, 5?2CH3COCH3, 6, 8, 9, and 10 have been determined by single-crystal X-ray diffraction. 相似文献
7.
《Journal of Coordination Chemistry》2012,65(24):4358-4366
New mixed-ligand complexes, [M2(BAMP)(bipy)2][MCl4]2, M=Co+2(1), Cu+2(2), [M2(TAMEN)(bipy)2][MCl4]2, M=Fe+2(3), Co2+(4), and [Fe2(TAMEN)(bipy)2][FeCl6]2 (5), where BAMP and TAMEN stand for the Mannich bases N,N′-bis(antipyryl-4-methylene)-piperazine and N,N′-tetra(antipyryl-4-methylene)-1,2-ethane-diamine, respectively, have been obtained and characterized by elemental analyses, conductometric and magnetic susceptibility measurements at room temperature, mass spectrometry, UV-Vis, infrared, and mass spectroscopy, and 1H NMR spectra for the ligands. 相似文献
8.
Three new CoIII complexes: [Co(bpy)2(pdtb)]3+ (1), [Co(bpy)2(pdta)]3+ (2) and [Co(bpy)2(pdtp)]3+ (3) have been synthesized and characterized. The DNA binding behavior of the CoIII complexes has been investigated by spectroscopic methods and viscosity measurements. The results indicate that the size and shape of the intercalated ligand have a marked effect on the binding affinity of complexes involving CT-DNA. Complexes (2) and (3) have been found to promote cleavage of plasmid pBR 322 DNA from the supercoiled form I to the open circular form II upon irradiation. Photocleavage mechanisms are proposed. 相似文献
9.
《Journal of Coordination Chemistry》2012,65(13):2297-2307
A new cobalt(II) complex [Co(DCA)(bipy)(H2O)] (DCA?=?demethylcantharate, 7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylate, C8H8O5; bipy?=?2,2′-bipyridine, C10H8N2) was synthesized from cobalt acetate, demethylcantharidin, and bipy. This complex was characterized by elemental analysis, molar conductance, infrared spectra, and X-ray single-crystal diffraction. It crystallized in orthorhombic crystal system and Pbca space group. The DNA binding of the complex was investigated by electronic absorption spectra and viscosity measurements. The complex binds to DNA via partial intercalation with binding constant K b of 4.02?×?104?L?M?1. The complex could quench the intrinsic fluorescence of bovine serum albumin through static quenching. The binding constant K A was 7.28?×?106?L?M?1 and binding site was one. 相似文献
10.
E. V. Antina L. A. Antina G. B. Guseva M. B. Berezin A. I. V’yugin A. S. Semeikin A. A. Ksenofontov 《Russian Journal of Inorganic Chemistry》2014,59(6):578-586
The effect of the attachment position of a methylene spacer in 2,2′-, 2,3′-, and 3,3′-bis(dipyrromethene) N4-ligands (H2L) on physicochemical properties of their dinuclear homoleptic helicates [Zn2L2], such as specific features of their molecular structure, luminescence spectral characteristics, lability in acid solutions, and thermal stability in an argon atmosphere, has been examined. It has been shown that the substitution of the biladiene-type helicand by its 2,3- and especially 3,3′-analogues leads to a considerable enhancement of the chromophoric properties, an increase (up to 30-fold) of the fluorescence quantum yield, and an increase in the stability of corresponding dinuclear helicates [Zn2L2]. 相似文献
11.
E. V. Rumyantsev A. Desoki Yu. S. Marfin E. V. Antina 《Russian Journal of Inorganic Chemistry》2011,56(9):1487-1490
The formation kinetics of heteroligand Ni(II) complexes with alkylated dipyrrolylmethenes of symmetric and asymmetric structure was studied. The kinetic and activation parameters of the reactions were determined. The spectral and kinetic data obtained, as well as available data on the solvation of Ni(II) acetate in electron-donor solvents, allowed us to propose an associatively activated concerted mechanism. The Ni(II) complex formation is mainly determined by the rate of substitution of the entering ligand for solvent molecules in the initial Ni(II) complex, that is, by creation of conditions for efficient donor-acceptor interaction. 相似文献
12.
IntroductionFunctional polymers bearing chiral moietiesand the extended conjugatedπ system have attract-ed considerable attention during the pastdecade[1,2 ] .The enantiodifferation properties ofsuch macromolecules give rise to multiple applica-tions in the fields of asymmetric catalysis,chiralsensors,polarized light emission and nonlinear op-tical materials[3 ,4] .Especially the incorporation ofoptically active binaphthyls in the main chain ofconjugated polymers can lead to an efficient ands… 相似文献
13.
CHEN Huili & YANG Pin Key Laboratory of Chemical Biology Molecular Engineering of Ministry of Education Institute of Molecular Science Shanxi University Taiyuan China 《中国科学B辑(英文版)》2005,48(1)
Base mismatches arise naturally in the life cycleof a cell as a result of either polymerase error or DNAdamage. Under most circumstances the cell correctsthese mispairings using a complex repair system toprevent mutations in the genetic code. Experimental… 相似文献
14.
《Journal of Coordination Chemistry》2012,65(14):2365-2376
The pseudo-tetrahedral complexes [CuL2]PF6·7H2O·CH3OH (1) and [AgL2]CF3SO3·H2O (2) (L?=?3,3′-bis(2-benzimidazolyl)-2,2′-bipyridine) have been synthesized and characterized through crystal structure analyses, electrochemistry, and spectroscopic methods. X-ray structural analyses of 1 and 2 indicate that sterically constrained N4 ligands L are cis and behave as bidentate chelates to a single metal ion in a pseudo-tetrahedral fashion through the benzimidazole. As two benzimidazolyl rings exhibit considerable steric hindrance, the bipyridine unit of L remains uncoordinated. The pseudo-tetrahedral cation [CuL2]+ shows a quasi-reversible CuI/CuII oxidation–reduction wave in the CV in DMF (counter-ion PF6?). The fluorescence titration of L with copper(I), silver(I), and also with pH have been conducted to examine the selectivity. The ligand shows remarkably high selectivity and sensitivity for Ag(I). 相似文献
15.
The [Pd(dpa)(tsser)] complex (1) is prepared from the reaction of PdCl2 and 2,2′-dipyridylamine (dpa) with 4-toluenesulfonyl-L-serine (tsserH2). This complex is characterized by spectral methods (IR, UV-Vis, 1H NMR, and luminescence), elemental analysis, thermal analysis (TG, DTA), and single crystal X-ray diffraction. X-ray structure determinations show that in this complex, PdII atoms are four-coordinated in a distorted square-planar configuration by two N atoms from a bidentate 2,2′-dipyridylamine ligand and one N atom and one O atom from a bidentate tsser2– ligand. 相似文献
16.
Two cobalt complexes, [Co(LSe)(phen)] · CH2Cl2
(1) and [Co(LSe)(N,N-Me2en)(CH3COO−)] (2) have been synthesized and characterized by elemental analyses, magnetic measurements, i.r. studies etc. Single crystal X- ray studies reveal that in complex (1) cobalt atom is in +2 oxidation state with trigonal bipyramidal geometry, while in complex (2) it is in +3 oxidation state and surrounded octahedrally. The asymmetric unit of complex (2) contains two crystallographically independent discrete molecules. Complex (1) was found to be paramagnetic with μeff = 2.19 BM indicating a low spin cobalt(II) d7 system, whereas complex (2) is found to be diamagnetic with cobalt(III) in low spin d6 state. The kinetic studies on the reduction of (2) by ascorbic acid in 80% MeCN–20% H2O (v/v) at 25 °C reveal that the reaction proceeds through the rapid formation of inner-sphere adduct, probably by replacing
the loosely coordinated AcO− group, followed by electron transfer in a slow step and is supported by a large Q (formation constant) value. 相似文献
17.
A series of FeIII complexes of stoichiometry [FeLX3].nH2O have been synthesized, where X=Cl–, HCO–2 and L is a flexible bidentate ligand, 1,3(bis-benzimidazolyl) propane and 1,4(bis-benzimidazolyl)butane. Mössbauer data reveals that the isomer shift values lie in the range typically observed for high spin FeIII complexes, while the slightly large quadrupole splitting parameter indicates a rhombically distorted FeIII centre. Cyclic voltammetric studies reveal that the E1/2 for the FeIII/FeII couple for the formate complex shifts more cathodically than for the chloride complex; implying that HCO–2 is more effective at lowering the Lewis acidity of the FeIII centre. 相似文献
18.
Cationic cyclometalated Ir(III) complexes (Ir1-Ir5) with fluorine-substituted 2-phenylpyridine (ppy) derivatives as C^N cyclometalating ligands and 2,2′-bipyridine (bpy) as the ancillary ligand, have been synthesized and fully characterized. The influences of the number and the position of fluorine atoms at the cyclometalating ligands on the photophysical, electrochemical and oxygen sensing properties of the Ir(III) complexes have been investigated systematically. The introduction of fluorine on the C^N cyclometalating ligands of the complexes results in blue-shifts of the maximum emission wavelengths, and increases in the photoluminescence quantum yields (ΦPL), phosphorescence lifetimes and energy gaps, compared to the non-fluorinated [Ir(ppy)2(bpy)]+PF6? (Ir0). Among them, 2-(2,4-difluorophenyl)pyridine-derived Ir4 shows the maximum blue-shift (514 nm vs. 575 nm for Ir0) and the highest ΦPL (50.8% vs. 6.5% for Ir0). The complex Ir3 with 2-(4-fluorophenyl)-5-fluoropyridine as C^N ligand exhibits the highest oxygen sensitivity and excellent operational stability in 10 cycles within 4000 s. 相似文献
19.
《Polyhedron》1999,18(20):2633-2640
Simple syntheses of the potentially tetradentate chelating ligands 6,6′-bis(3-pyrazolyl)-2,2′-bipyridine (H2L1), and 6,6′-bis(2-hydroxyphenyl)-2,2′-bipyridine (H2L2) are described: H2L1 is a new ligand, whereas H2L2 is known, but investigation of its coordination chemistry has been hampered by the lack of a simple synthesis. Complexes of both have been structurally characterised and reveal many interesting features. [Cu(HL1)(H2O)][PF6] is square pyramidal with an axial H2O ligand, but, in the solid state, forms a hydrogen-bonded dimer in which the peripheral pyrazolyl groups of HL1 (one protonated, one deprotonated) in one complex unit form a two-point ‘chelating’ hydrogen-bonding interaction with the axial water ligand of the second, and vice versa. In contrast, [Ag2(L1)2][BF4]2 is a dinuclear double helicate because of the preference of Ag(I) ions for a pseudo-tetrahedral geometry. [Cu(L2)] has a typical near-planar geometry with a N2O2 donor set, and monomeric units are associated into centrosymmetric dimers in the crystal via weak axial Cu⋯O(phenolate) interactions to give an asymmetric [Cu2(μ-phenolate)2] core. In {[Cu(L2)]2H}(PF6), the two monomeric [Cu(L2)] units are also associated via axial phenolate interactions to give a dimer with a [Cu2(μ-phenolate)2] core, but, in addition, the extra proton per dimer unit is located at the centre of a short, strong O⋯H⋯O hydrogen-bond that links a phenolate group from each of the two monomer units. The geometry of dimer formation is changed in order to allow the phenolate groups to approach one another closely enough for this hydrogen-bond to form. 相似文献
20.
Xian-Lan Hong Mao-Hua Zeng Li-Juan Liu Xiu-Li Ye Dao-Sheng Yi 《Journal of Coordination Chemistry》2017,70(8):1438-1450
A dioxovanadium(V) complex, [VO2(moptpy)](ClO4) (1, moptpy = 4′-(3-methoxyphenyl)2,2′:6′2″-terpyridine), was synthesized and characterized by elemental analysis, ESI-MS, UV–vis, IR, and 1H, 13C, and 51V NMR. The cytotoxicity in vitro of 1 was evaluated against cancer cell lines HepG-2 (hepatocellular carcinoma), SGC-7901 (gastric carcinoma), SiHa (cervical cancer), BEL-7402 (hepatocellular), and rat PC-12 (pheochromocytoma) by the MTT method. The results demonstrated that 1 exhibits superior anticancer activity in vitro with much lower values of 50% inhibitive concentration (IC50) against the selected cell lines than cisplatin, and 1 shows the highest cytotoxic activity toward SGC-7901 cells (IC50 = 1.3 ± 0.1 μM) among the selected cell lines. A series of cellular morphological and staining experiments were carried out, and the results indicated that 1 can effectively induce apoptosis of SGC-7901 cells through a ROS-mediated mitochondrial dysfunction pathway. In addition, cellular incorporation and cell cycle analysis were also performed, and it was concluded from the experimental observations that 1 can efficiently enter into the cell nuclei, and the complex inhibits cell growth in SGC-7901 cell at G0/G1 phase. 相似文献