共查询到20条相似文献,搜索用时 31 毫秒
1.
Bing-Fan Long Qin Huang Shu-Long Wang Yan Mi Meng-Fan Wang Ting Xiong 《Journal of Coordination Chemistry》2019,72(4):645-663
Five cobalt(II) complexes based on 1H-indazole-3-carboxylic acid (H2L), [Co(phen)(HL)2]·2H2O (1), [Co(5,5′-dimethyl-2,2′-bipy)(HL)2] (2), [Co(2,2′-bipy)2(HL)2]·5H2O (3), [Co2(2,9-dimethyl-1,10-phen)2(L)2] (4) and [Co2(6,6′-dimethyl-2,2′-bipy)2(L)2]·H2O (5) (2,2'-bipy = 2,2′-bipyridine, phen = 1,10-phenanthroline), have been synthesized and structurally characterized by elemental analyses, IR and UV-vis spectroscopies and single-crystal X-ray crystallography. The results indicate that 1–3 possess mononuclear Co(II) structures, while 4 and 5 exhibit binuclear structure. 1D water tape which is linked by the multiple hydrogen bonds was embedded in the 3D motif of complex 3. Complexes 4 and 5 show two orthogonal planes of motif that was constituted by phen/2,2′-bipy and indazole acid, respectively. The intermolecular interactions including hydrogen bonding and π-π stacking interactions are stabilizing these complexes. The interactions of the synthesized complexes with calf-thymus DNA (CT-DNA) have been investigated by UV-vis absorption titration, ethidium bromide displacement assay and viscosity measurements. The results reveal that the complexes could interact with CT-DNA via a groove binding mode. Their behavior rationalization was further theoretically studied by molecular docking. 相似文献
2.
Ningning Zhao Kang Wang Wenjun Li Yongzhong Bian Changyan Sun Zhidong Chang Hongxia Fan 《Solid State Sciences》2011,13(11):1948-1953
A series of transition metal coordination polymers [Co(H3L)2(4,4′- bpy)(H2O)2]n?n(4,4′-bpy) (1), [Ni(H2L)(4,4′-bpy)(H2O)2]n (2), [Co2(L)(phen)2(H2O)4]n?(H2O)2n (3), and [Ni2(L)(phen)2(H2O)4]n?(H2O)2n (4) have been assembled from a semirigid multicarboxylate ligand 3,3′-(1,4-phenylenebis(oxy))diphthalic acid (H4L) with the help of 4,4′-bipyridine (4,4′-bpy) ligand or 1,10-phenanthroline (phen) ligand. X-ray single crystal diffraction analysis reveals that complex 1 crystallizes in the space group of P − 1 and displays a one-dimensional (1D) chain structure constructed from 4,4′-bpy ligand and H3L ligand, which was further interlinked to form a three-dimensional network via hydrogen bonds. In complex 2, Ni(II) atoms are coordinated by L ligand in monodentate fashion to form alternate left- and right-helices, which are further bridged together by the coordination interactions between Ni(II) atoms and 4,4′-bpy, leading to a 2-fold (4, 4)-connected interpenetrating network. Isostructural complexes 3 and 4 belong to the space group P − 1 and display a 1D chain structure constructed from phen and L ligands, which was further interlinked to form a 2D plane via π–π interactions. In addition, their thermal and luminescent properties were also investigated. 相似文献
3.
《Journal of Coordination Chemistry》2012,65(3):358-372
Mn(II), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) complexes of multifunctional triaminoxime have been synthesized and characterized by elemental analyses, IR, UV–Vis spectra, magnetic moments, 1H- and 13C-NMR spectra for ligand and its Ni(II) complex, mass spectra, molar conductances, thermal analyses (DTA, DTG and TG) and ESR measurements. The IR spectral data show that the ligand is bi-basic or tri-basic tetradentate towards the metals. Molar conductances in DMF indicate that the complexes are non-electrolytes. The ESR spectra of solid copper(II) complexes [(HL)(Cu)2(Cl)2] · 2H2O (2) and [(L)(Cu)3(OH)3(H2O)6] · 7H2O (6) show axial symmetry of a d x²???y 2 ground state; however, [(HL)(Co)] (4) shows an axial type with d Z 2 ground state and manganese(II) complex [(L)(Mn)3(OH)3(H2O)6] · 4H2O (10) shows an isotropic type. The biological activity of the ligand and its metal complexes are discussed. 相似文献
4.
《Journal of Coordination Chemistry》2012,65(24):4237-4254
Seven new transition metal complexes formulated as [M2(1,4-tpbd)(diimine)2(H2O)2]4+ [M = Zn, Co, Ni, Cd; 1,4-tpbd = N,N,N′,N′-tetrakis(2-pyridylmethyl)benzene-1,4-diamine; diimine is a N,N-donor heterocyclic base like 1,10-phenanthroline (phen), 2,2′-bipyridine (bpy), 4,5-diazafluoren-9-one (dafo)] have been synthesized and structurally characterized by X-ray crystallography: [Zn2(1,4-tpbd)(phen)2(H2O)2]4+ (1), [Zn2(1,4-tpbd)(bpy)2(H2O)2]4+ (2), [Co2(1,4-tpbd)(phen)2(H2O)2]4+ (3), [Ni2(1,4-tpbd)(phen)2(H2O)2]4+ (4), [Ni2(1,4-tpbd)(bpy)2(H2O)2]4+ (5), [Ni2(1,4-tpbd)(dafo)2(H2O)2]4+ (6) and [Cd2(1,4-tpbd)(phen)2(H2O)2]4+ (7). Single crystal diffraction reveals that the metals in the complexes are all in a distorted octahedral geometry. The interactions of the seven complexes with calf thymus DNA (CT-DNA) have been investigated by UV absorption, fluorescence, circular dichroism spectroscopy and viscosity measurements. The apparent binding constants (Kapp) are calculated to be 5.2?×?105 M?1 for 1, 1.05?×?105 M?1 for 2, 5.76?×?105 M?1 for 3, 4.57?×?105 M?1 for 4, 1.29?×?105 M?1 for 5, 1.7?×?105 M?1 for 6, 2.53?×?105 M?1 for 7, the binding propensity to the calf thymus DNA in the order: 3 (Co-phen) > 1 (Zn-phen) > 4 (Ni-phen) > 7 (Cd-phen) > 6 (Ni-dafo) > 5 (Ni-bpy) > 2 (Zn-bpy). Furthermore, these complexes display efficient oxidative cleavage of supercoiled DNA; the Zn(II)/H2O2 and Cd(II)/H2O2 systems efficiently cleave DNA attributed to the peroxide ion coordinated to the Zn(II) and Cd(II), which enhanced their nucleophilicity, this is rare. 相似文献
5.
Muharrem Kaya Cengiz Yenikaya Alper Tolga Colak Ferdag Colak 《Russian Journal of General Chemistry》2008,78(9):1808-1815
Two different metal complexes of [Co(HL)(L)(Ac)2]·4H2O (I) and [Ni2(L)2(Ac)2]·4H2O (II), have been synthesized with newly prepared amine-imine-oxime ligand [HL = 3-(4′-aminobiphenyl-4-ylimino)-butan-2-one oxime,
Ac = CH3COO−]. This ligand HL was prepared by the condensation of diacetylmonoxime with benzidine. The structure of the ligand and complexes
have been proposed by elemental analyses, IR, 1H, and 13C NMR, electronic spectra, magnetic susceptibility measurements, mass spectra, molar conductivity and thermo gravimetric analysis.
The molar conductance measurements of the complexes in DMF solution correspond to non electrolytic nature for the complexes.
Octahedral and tetrahedral geometries have been determined to the complexes of Co(III) and binuclear Ni(II) respectively.
The ligand and its metal complexes were tested in vitro for their biological effects. Their activities against two gram-positive
(Bacillus subtilis and Staphylococcus aureus) and one fungal specie (Candida albicans) were found. They were inactive against tested gram negative bacteria.
The text was submitted by authors in English. 相似文献
6.
Su-Ni Qin Zi-Lu Chen Dong-Cheng Liu Wan-Yun Huang Fu-Pei Liang 《Transition Metal Chemistry》2011,36(4):369-378
Four metal complexes of N,N′-bis(salicyl)-2,6-pyridine-dicarbohydrazide ligand (H6L), [CoII(H4L)(H2O)2]·2DMF (1), [ZnII(H4L)(H2O)2]·2DMF (2), [CdII(H4L)(Py)2]·DMF·Py (3), and [CoIICo2III(H4L)4(H2O)4]·DMF·H2O (4), were synthesized and characterized by elemental analysis, IR, and single-crystal X-ray diffraction analysis. Structural
studies revealed that complexes 1–3 present discrete mononuclear structures and complex 4 displays a centrosymmetric mixed-valence trinuclear structure. All four complexes are further extended into interesting two-
or three-dimensional supramolecular frameworks. The luminescent properties of 2 and 3 were studied, which show emissions with maxima at 485 nm upon excitation at 396 nm for 2 and 476 nm upon excitation at 397 nm for 3, respectively. 相似文献
7.
《Journal of Coordination Chemistry》2012,65(17):1513-1523
Three new copper(II) complexes with isonicotinic acid N-oxide (HL) and 1,10-phenanthroline (phen) as ligands, [Cu(L)(phen)(H2O)]2(NO3)2···2H2O (1), [Cu(L)(phen)(H2O)]2(ClO4)2···2H2O (2), and [Cu(L)(phen)Br]2- [Cu(L)(phen)(H2O)]2Br2···6H2O (3) have been synthesized and structurally characterized. The structures of all three complexes feature a Cu2 dimer formed by two Cu(II) ions interconnected by two bridging ligands. Each copper(II) ion has a distorted square pyramidal coordination geometry with elongated axial coordination by an aqua ligand or halogen anion. The isonicotinic acid N-oxide anion is bidentate, being coordinated to two Cu(II) ions through its N-O oxygen and one of its carboxylate oxygen atoms. Magnetic susceptibility measurements show a Curie–Weiss paramagnetic behavior characteristic of one unpaired electron for a copper(II) ion for all three complexes. 相似文献
8.
Norbani Abdullah Zainudin Arifin Edward R. T. Tiekink Naima Sharmin Nur Syamimi Ahmad Tajidi Siti Amira Mat Hussin 《Journal of Coordination Chemistry》2016,69(5):862-878
A covalent mononuclear complex, [Cu(p–HOC6H4COO)2(cyclam)] (1), and two ionic mononuclear complexes, [Cu(cyclam)(H2O)2](p–CH3OC6H4COO)2 (2) and [Cu(cyclam)(H2O)2](p–CH3(CH2)15OC6H4COO)2·H2O (3), were formed from reaction of cyclam with [Cu2(p–HOC6H4COO)4(H2O)2], [Cu2(p–CH3OC6H4COO)4(H2O)2] and [Cu2(p-CH3(CH2)15OC6H4COO)4(H2O)2], respectively. These complexes were isolated as purple crystals with molecular structures showing distorted octahedral N4O2 geometry. Complexes 1 and 2 were irreversibly reduced to Cu(I) and oxidized to Cu(III), while 3 was redox inactive. Complex 2 reacted with N-(hexadecyl)isonicotinamide (L) to form [Cu(cyclam)(L)2](p–CH3OC6H4COO)2 (4). These complexes were thermally stable (Tdec > 200 °C for 1–3 and 174 °C for 4). Complexes 3 and 4 behaved as ionic liquids (melting temperatures lower than 100 °C) and exhibited mesomorphism. 相似文献
9.
《Journal of Coordination Chemistry》2012,65(16):1409-1415
Two new complexes, [Zn(phen)2(H2O)2]2L·H2O (1) and [Cu(phen)(L)(H2O)2]L·3H2O (2), where HL?= 4-aminobenzenesulfonic acid and phen = o-phenanthroline, have been synthesized and their crystal structures determined by X-ray diffraction. In the complexes the Cu(II) and Zn(II) atoms revealed two different coordination environments. Complex 1 consists of a cation [Zn(phen)2(H2O)2]2+, in which Zn(II) is six-coordinated by four nitrogen atoms from two o-phenanthroline molecules and by two water molecules. Complex 2 has two crystallographically unique Cu(II) ions, where Cu(II) ion is five-coordinate with two nitrogen atoms of o-phenanthroline, two water molecules and one sulfonate oxygen atom. The electrochemical behavior and FT-IR of the two compounds have also been studied in detail. 相似文献
10.
《Journal of Coordination Chemistry》2012,65(20):3296-3305
1-(2-Pyridyl)benzotriazole (L1) and 1-(4-pyridyl)benzotriazole (L2) with transition metal cations Co(II), Ni(II) and Cu(II) give four coordination complexes, [{Cu(L1)2(H2O)2} · 2NO3] (1), [{Co(L1)2(H2O)2} · 2NO3] (2), [Ni(L2)2(NO3)2(H2O)2] (3), and [Cu2(L2)2(CH3COO)4] (4). In 1–4, different supramolecular frameworks are formed through hydrogen bonding and/or π–π interactions. 相似文献
11.
Ezzat Khan Zarif Gul Adnan Shahzad Muhammad Saeed Jan Farhat Ullah M. N. Tahir 《Journal of Coordination Chemistry》2017,70(24):4054-4069
Coordination behavior of 4,5,6,7-tetrahydro-1H-indazole (H-Ind) with Cu(II), Co(II), and Ag(I) was studied. The ligand affords complexes bearing different geometries depending upon the metal and anion present in the starting salts. Five compounds with different structural perspectives, trans-[CuCl2(H-Ind)4] (1), trans-[CuBr2(H-Ind)4] (2), trans-[Cu(CH3COO)2(H-Ind)2] (3), trans-[CoCl2(H-Ind)4] (4), and [Ag(H-Ind)2]NO3 (5), were obtained. The ligand adopts tetrahydro-1H-indazole isomeric form in Cu(II) and Co(II) complexes and with Ag(I) ion the same ligand adopts tetrahydro-2H-indazole form. In the case of sterically demanding acetate counter ion in contrast to Cl or Br, the Cu(II) ion accepts two equivalents of the ligand and four-coordinated square planar complex was obtained. With AgNO3, the expected complex was obtained. The yield of reactions was >80% and all complexes were obtained as crystalline material from the reaction mixtures. Their structures were determined by X-ray diffraction and all complexes were tested for antibacterial (Enterobacter sakazkii, Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniea), antifungal (Aspergillus flavus, Aspergillus fumegatus, Aspergillus nigar, Fusarium oxysporium), and antioxidant (2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS) and 2,2-diphenyl-1-picrylhydrazyl (DPPH)) activities. The same were also tested as inhibitors against acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) . 相似文献
12.
《Journal of Coordination Chemistry》2012,65(6):1094-1106
Pyrazolone derivatives (Z)-4-((2-hydroxyethylimino)(p-tolyl)methyl)-3-methyl-1-phenyl-1H-pyrazol-5(4H)-one [PMP-EA] (1), (Z)-1-(3-chlorophenyl)-4-((2-hydroxyethylimino)(p-tolyl)methyl)-3-methyl-1H-pyrazol-5(4H)-one [MCPMP-EA] (2), and (Z)-4-((2-hydroxyethylimino)(p-tolyl)methyl)-3-methyl-1-p-tolyl-1H-pyrazol-5(4H)-one [PTPMP-EA] (3) have been synthesized and characterized. The molecular geometry of 2 has been determined by single-crystal X-ray study. These ligands exist in amine-one tautomeric form in the solid state. Three copper(II) complexes, [Cu(PMP-EA)(H2O)2] (4), [Cu(MCPMP-EA)(H2O)2] (5), and [Cu(PTPMP-EA)(H2O)2] (6), respectively, have been synthesized using these ligands and characterized by microanalytical data, molar conductivity, IR, UV–Visible, FAB-Mass, magnetic measurement, TG-DTA studies, and ESR spectral studies; Cu(II) is five-coordinated with [ML(H2O)2] composition. The interaction of the complexes with CT-DNA (calfthymus) was investigated using different methods. The results suggest that the copper complexes bind to DNA via intercalation and can quench the fluorescence intensity of EB bound to DNA. 相似文献
13.
Norbani Abdullah Suhana Mohd Said Yanti Yana Halid Megat Muhammad Ikhsan Megat Hasnan Naima Sharmin Siti Amira Mat Hussin 《Journal of Coordination Chemistry》2016,69(19):2954-2971
Nickel(II) carboxylates [Ni(CH3(CH2)14COO)2(H2O)2] (1) and [Ni(C6H5COO)2(H2O)2] (2) were obtained from reactions of NiCl2·6H2O with CH3(CH2)14COONa and C6H5COONa, respectively. Complex 1 reacted with pyridine (pyr) to form [Ni(CH3(CH2)14COO)2(pyr)2(H2O)2] (3) and [Ni2(μ2-H2O)(CH3(CH2)14COO)4(pyr)4] (4) in the same reaction mixture, and reacted with cyclam to form an ionic complex, [Ni(CH3(CH2)14COO)(cyclam)(H2O)]CH3(CH2)14COO·4H2O (5). In contrast, 2 reacted with cyclam to form [Ni(C6H5COO)2(cyclam)] (6). Finally, 6 reacted with p-(hexadecyloxy)pyridine (L) to form an ionic complex, [Ni(cyclam)(L)2](C6H5COO)2 (7). Complexes 3–6 were single crystals. All complexes have octahedral Ni(II) center(s) and were magnetic. Complexes with cyclam as co-ligand were more thermally stable than those with pyridine and its derivative, L. Complexes 3 and 4 were mesomorphic after partial loss of water and/or pyridine ligands on heating. The ionic complexes 5 and 7 were not mesomorphic, but showed good thermoelectrical behavior with negative Se values in CHCl3 (?0.28 mV K?1 for 5; -0.39 mV K?1 for 7) and positive Se values in C2H5OH (+0.25 mV K?1 for 5; +0.20 mV K?1 for 7). 相似文献
14.
《Journal of Coordination Chemistry》2012,65(10):1720-1728
The reaction of H2L (N,N ′-bis(5-ethyl-1,3,4-thiadiazol-2-yl)-2,6-pyridinedicarboxamide) with Ni(II) salts gave crystals of two new complexes, [Ni3(µ3-O)(H2L)(L)2] · 2DMF (1) and [Ni2(µ-H2O)(CH3OH)(DMF)(L)2] · H2O · CH3OH (2). The complexes were characterized by elemental analysis, IR, thermal analysis, and X-ray single crystal diffraction. Complex 1 is a trinuclear complex containing a triangle frame in the center formed by three Ni(II) atoms with a bridging µ3-O. Complex 2 is dinuclear formed by two Ni(II) atoms with a bridging H2O. H2L coordinates to metal centers as a pentadentate ligand in 1 and tetradentate in 2. Thermal analysis shows that the thermal stability of 1 is higher than that of 2. In addition, the magnetic properties of 2 are also reported. 相似文献
15.
在水热条件下,由联苯-2,4,4',6-四甲酸(H4bptc),4,4'-联吡啶(bipy),合成了3种锌配位聚合物[Zn(bptc)0.5]n (1),[Zn2(bptc)(H2O)3]n·nH2O (2),[Zn2(bptc)(H2O)(bipy)1.5]n·nH2O (3),用元素分析、红外光谱等方法对配合物的组成进行了表征,并通过单晶X-射线衍射方法测定了配合物的晶体结构.结果表明:配合物1具有双核结构,八元环金属簇Zn2(COO)22+自组装成具有(6,6)-连接拓扑结构;配合物2具有(4,5,6)-连接拓扑结构;配合物3在辅助配体的构筑下形成三维网络结构.用溴化乙锭荧光探针法测试了配合物对EB-DNA复合体系的荧光猝灭效应,实验结果显示配合物均能使EB-DNA复合体系的荧光发生不同程度的猝灭,由此推测配合物均与DNA发生了不同程度的插入作用,引入具有刚性平面辅助配体之后的配合物3,其作用力又强于不加辅助配体的配合物1和2. 相似文献
16.
Self‐assembly of Zn (II) or Cd (II) nitrates, flexible bis (pyridyl)‐diamine, as well as arenesulfonic acids, leads to the formation of ten coordination polymers, namely, [Zn(L1)(H2O)3]·2(p‐TS)·2H2O ( 1 ), [Zn(L1)(H2O)2]·2(p‐TS)·2H2O ( 2 ), [Zn(L1)2(p‐TS)2] ( 3 ), [Zn(H2L1)(H2O)4]·2(1,5‐NDS)·2H2O ( 4 ), [Zn(H2L2)(H2O)4]·2(1,5‐NDS)·4MeOH ( 5 ), [Cd(L1)(p‐TS)(NO3)]·H2O ( 6 ), [Cd(L1)(1,5 ‐NDS)0.5(H2O)]·0.5(1,5‐NDS)·H2O ( 7 ), [Cd(L2)(H2O)2]·(p‐TS)·(NO3)·3H2O ( 8 ), [Cd(L2)(1,5‐NDS)] ( 9 ) and [Cd(L2)(1,5‐NDS)]·MeOH ( 10 ) (L1 = N,N′‐bis (pyridin‐4‐ylmethyl) ethane‐1,2‐diamine, L2 = N,N′‐bis (pyridin‐3‐ylmethy l)ethane‐1,2‐diamine, p‐HTS = p‐toluenesulfonic acid, 1,5‐H2NDS = 1,5‐naphthalene disulfonic acid), which have been characterized by elemental analysis, IR, TG, PL, powder and single‐crystal X‐ray diffraction. Complexes 1 , 4 , 5 and 6 present linear or zigzag chain structures accomplished by the interconnection of adjacent M (II) cations through L1 ligands or protonated H2L12+/H2L22+ cations, while complexes 2 , 3 and 8 show similar (4,4) layer motifs constructed from the connection of M (II) cations through L1 and L2. The same coordination modes of L1 and L2 in complexes 7 and 9 join adjacent Cd (II) cations to form double chain structures, which are further connected by bis‐monodentate 1,5‐NDS2? dianions into different (6,3) and (4,4) layer motifs. The L2 molecules in complex 10 join adjacent Cd (II) cations together with 1,5‐NDS2? dianions to form 3D network with hxl topology. Therefore, the diverse coordination modes of the bis (pyridyl) ligand with chelating spacer and the feature of different arenesulfonate anions can effectively influence the architectures of these complexes. Luminescent investigation reveals that the emission maximum of these complexes varies from 374 to 448 nm in the solid state at room temperature, in which complexes 4 , 5 , 7 , 9 and 10 show average luminescence lifetimes from 7.20 to 14.82 ns. Moreover, photocatalytic properties of complexes 7–10 towards Methylene blue under Xe lamp irradiation are also discussed. 相似文献
17.
《Journal of Coordination Chemistry》2012,65(16):2739-2759
Eight Cu(II) complexes with N-(p-, m- or o-trifluoromethylbenzyl)iminodiacetate chelators (x-3F ligands) have been synthesized to promote C–F/H interligand interactions involving the F3C-group: {[Cu(μ2-p-3F)(H2O)]·3H2O]}n (1), [Cu(m-3F)(H2O)2] (2), [Cu(p-3F)(Him)(H2O)] (3), [Cu(m-3F)(Him)(H2O)] (4), [Cu(o-3F)(Him)(H2O)] (5), [Cu2(p-3F)2(H5Meim)2(H2O)2] (6), [Cu(m-3F)(H5Meim)(H2O)] (7), and [Cu(o-3F)(H5Meim)(H2O)] (8) [Him and H5Meim = imidazole and the “remote” tautomer 5-methylimidazole, respectively]. The compounds were studied by single-crystal X-ray diffraction, FT-IR, electronic spectra and coupled thermogravimetric + FT-IR methods. The conformation of the iminodiacetate chelating moiety (IDA group) is fac-NO + O(apical) in 1 and mer-NO2 in 2–8. The fac-IDA conformation observed in 1 is related to its polymeric structure and the coordination of a O’-carboxylate donor, from an adjacent complex unit, trans to the Cu–N(IDA) bond. The mer-IDA conformation in 2 is in agreement with similar compounds with an aqua ligand trans to the corresponding Cu–N(IDA) bond. As expected, the ternary complexes 3–8 feature a mer-IDA conformation. Some of the studied complexes exhibit disorder in the –CF3 group and C–H?F interligand interactions along with conventional N–H?O and O–H?O interactions. The thermal decomposition of all studied compounds under air flow produces variable amounts of trifluorotoluene. 相似文献
18.
在水热条件下,由联苯-2,4,4′,6-四甲酸(H4bptc),4,4′-联吡啶(bipy),合成了3种锌配位聚合物[Zn(bptc)0.5]n(1),[Zn2(bptc)(H2O)3]n·n H2O(2),[Zn2(bptc)(H2O)(bipy)1.5]n·n H2O(3),用元素分析、红外光谱等方法对配合物的组成进行了表征,并通过单晶X-射线衍射方法测定了配合物的晶体结构。结果表明:配合物1具有双核结构,八元环金属簇Zn2(COO)22+自组装成具有(6,6)-连接拓扑结构;配合物2具有(4,5,6)-连接拓扑结构;配合物3在辅助配体的构筑下形成三维网络结构。用溴化乙锭荧光探针法测试了配合物对EB-DNA复合体系的荧光猝灭效应,实验结果显示配合物均能使EB-DNA复合体系的荧光发生不同程度的猝灭,由此推测配合物均与DNA发生了不同程度的插入作用,引入具有刚性平面辅助配体之后的配合物3,其作用力又强于不加辅助配体的配合物1和2。 相似文献
19.
《Journal of Coordination Chemistry》2012,65(11):1859-1870
A series of metal complexes of Schiff bases derived from condensation of sulfa-guanidine with 1-benzoylacetone (H2L1), 2-hydroxybenzophenol (H2L2), dibenzoylmethane (H2L3), 5-methylisatine (H2L4), and 1-methylisatine (H2L5) have been synthesized. The complexes are characterized by elemental analysis, molar conductance, magnetic moment measurements, IR, UV–Vis, 1H NMR, and ESR spectra, as well as thermogravimetric analysis. The low molar conductance values indicate the complexes are nonelectrolytes. IR and 1H NMR spectra show that H2L1–H2L5 are coordinated to metal ions by two bidentate centers. Mn(II), Co(II), Ni(II), and Cu(II) complexes display paramagnetic behavior, whereas the Zn(II)-complex was diamagnetic. All studies confirm the formation of an octahedral geometry for [Cu2L1(AcO)2(H2O)6] · 3H2O (1), [Mn2L4(AcO)2(H2O)6] · 2H2O (6), [Ni2L4(AcO)2(H2O)6] · 2H2O (8), a tetrahedral geometry for [Cu2L2(AcO)2(H2O)2] (2), [Cu2(L4)2] (4), [Co2(L4)2] · 2H2O (7) and [ZnHL4(AcO)(H2O)] · 2H2O (9) and a trigonal bipyramid geometry for [Cu2L3(AcO)2(H2O)4] (3) and [Cu2HL5(AcO)3(H2O)3] · H2O (5). H2L4 was most effective on Gram negative, Gram positive bacteria, and fungi (diameters inhibition zone ranged between 10.5–27.5 mm) after 24 and 48 h, respectively. Complex 8 showed moderate antimicrobial activity. Its minimum inhibitory concentration (MIC) against Escherichia coli, Bacillus subtilis, Candida albicans and Aspargllus flavas was 20 mg L–1. The compound proved to be of moderate toxicity and its LD50 was 20 mg L–1. 相似文献
20.
The 2-methylimidazole complexes of Co(II), Ni(II), Cu(II) and Zn(II) orotates, mer-[Co(HOr)(H2O)2(2-meim)2] (1), mer-[Ni(HOr)(H2O)2(2-meim)2] (2), [Cu(HOr)(H2O)2(2-meim)] (3) and [Zn(HOr)(H2O)2(2-meim)] (4), were synthesized and characterized by elemental analysis, spectral (UV–Vis and FT-IR) methods, thermal analysis (TG, DTG and DTA), magnetic susceptibility, antimicrobial activity studies and single crystal X-ray diffraction technique. The complexes 1 and 2 have distorted octahedral geometries with two monodentate 2-methylimidazole and one bidentate orotate and two aqua ligands. The complexes 3 and 4 have distorted square pyramidal and trigonal bipyramidal geometry, respectively, with one 2-methylimidazole, bidentate orotate and aqua ligands. The orotate coordinated to the metal(II) ions through deprotonated nitrogen atom of pyrimidine ring and oxygen atom of carboxylate group as a bidentate ligand. The antimicrobial activities of 1 and 4 were found to be more active gram (+) than gram (−) and 4 could be use for treatment Staphylococcus aureus. 相似文献