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1.
Mononuclear O,O-coordinated complexes K 2(MLCl 2) M = Zn(II), Cd(II) and dinuclear complexes (MZnLCl 2R 2) x along with dinuclear N, N-coordinated complexes (M′ZnH 2LCl 2R 2) y (where M = Zn(II), Cd(II), Hg(II) and M′ = M and Sn(IV); R = Cl, CH 3; x = 0, ?2; y = 0, +2) of N′-1-, N′-2-dihydroxy- N-1-, N-2-dipyridin-2-ylethanedimidamide (H 2L) have been prepared. All complexes have been characterized by 1H NMR, IR, EI-mass spectroscopy and elemental microanalysis. These results are in agreement with our prediction for structures of mono and dinuclear complexes of H 2L and L ?2 with Zn(II) in the gas phase by theoretical studies. 相似文献
2.
Potentially tetradentate ligands N, N"-di(2-hydroxybenzyl)ethylenediamine (L 1) and N, N"-di(2-hydroxybenzyl) o-phenylenediamine (L 2) and complexes of Cu(II), Co(II), and Ni(II) with L 1and L 2were synthesized. The EPR and electronic spectroscopy methods were used to reveal the octahedral structure of the Cu(II) complex with L 1in the solid state. In water–alcohol solutions, the Cu(II) and Ni(II) complexes with both ligands have distorted octahedral structures. The Co(II) complexes form dioxygen adduct with L 1. In the presence of oxygen, the ligands in the obtained complex compounds can undergo oxidative dehydrogenation with selective formation of the respective disalicylaldimines. In the case of L 2, the oxidative dehydrogenation is observed for the complexes of all studied metals in comparatively mild conditions ( T= 30°C, methanol and other solvents), while in the case of L 1, it occurs only with the Co(II) complexes in the presence of pyridine. 相似文献
3.
Zn(II) complexes of N-(quinolin-8-yl)picolinamide (HL1) (1) and N2,N6-di(quinolin-8-yl)pyridine-2,6-dicarboxamide (H2L2) (2) have been synthesized by deprotonation of the ligands and characterized by IR, NMR, and Single crystal X-ray crystallography. The mononuclear [Zn(L1)2] (3) and homodinuclear [Zn2(L2)2] (4) complexes are characterized by distorted octahedral geometries stabilized by hydrogen bonding and weak π···π interaction. The complexes demonstrate intense fluorescence bands in comparison with their corresponding ligands with well-distinguished intensity. The complexes act as efficient catalysts in various transesterification reactions. Among those, the best results have been achieved with complex 3 in conversion of 4-nitrophenylacetate into methyl acetate within 3 h. 相似文献
4.
Schiff bases o-vanilidene-1-aminobenzene (HL 1) and o-vanilidene-2-methyl-1-aminobenzene (HL 2) lead to the formation of mono- and bis-[(Cl)Zn(L 1)] ( 1), [(Cl)Zn(L 2)] ( 2), [(Cl)Hg(L 1)] ( 3), [(Cl)Hg(L 2)] ( 4), [Zn(L 1) 2] ( 5), [Zn(L 2) 2] ( 6), [Hg(L 1) 2] ( 7), and [Hg(L 2) 2] ( 8) complexes by reactions of zinc(II) and mercury(II) chlorides in different mole ratio(s). Complexes 1– 8 have been characterized by elemental analyses (Zn, Hg, C, H, Cl, and N), melting point and spectral (IR, 1H-NMR), PXRD, molar conductivity measurement, and TGA. Conductivity measurements suggest non-electrolytes. Structural compositions have been assigned by mass spectral studies. Four-coordinate geometry may be assigned to these complexes tentatively. Structural study reveals that in 1– 4 two metal centers are held together by two bridged (μ 2-Cl) chlorides, whereas 5– 8 contain two bidentate Schiff-base ligands around one metal-producing monomers. 相似文献
5.
The complexes MLCl 2 · nH 2O and ML 2Cl 2 · nH 2O, where M = Cu(II), Zn and n = 1–4, were isolated and identified due to the reactions of Cu(II) and Zn(II) chlorides with 2,4,7-trinitrofluorene (L 1), 2,4,7-trinitrofluorenone (L 1a), and 2,4,5,7-tetranitrofluorene (L 2). It was shown that, during complex formation, L 1 and L 2 were oxidized to fluorenones (L 1a, L 2a) and as neutral ligands formed 1: 1 and 2: 1 complexes with metal cations. A single crystal of tetranitrofluorenone (L 2a) was isolated, and its crystal and molecular structure was determined. The complexes were studied by X-ray powder diffraction
analysis, their spectral (IR and UV) characteristics were determined, and the structures for the complexes were proposed. 相似文献
6.
The new Mannich bases bis(1,4-diphenylthiosemicarbazide methyl) phosphinic acid H 3L 1 and bis(1,4-diphenylsemicarbazide methyl) phosphinic acid H 3L 2 were synthesised from the condensation of phosphinic acid, formaldehyde with 1,4-diphenyl thiosemicarbazide and 1,4-diphenylsemicarbazide,
respectively. Monomeric complexes of these ligands, of general formulae K 2[Cr III(L
n
)Cl 2], K 3[Mn II(L
n
)Cl 2] and K[M(L
n
)] (M = Co(II), Ni(II), Cu(II), Zn(II) or Hg(II); n = 1, 2), are reported. The mode of bonding and overall geometry of the complexes were determined through physico-chemical
and spectroscopic methods. These studies revealed octahedral geometries for the Cr(III), Mn(II) complexes, square planar for
Co(II), Ni(II) and Cu(II) complexes and tetrahedral for the Zn(II) and Hg(II) complexes. 相似文献
7.
Two novel Schiff base ligands (L a and L b) were prepared from the condensation of quinoline 2‐aldehyde with 2‐aminopyridine (ligand L a) and from the condensation of oxamide with furfural (ligand L b). Mixed ligand complexes of the type M +2L a/b L c were prepared, where (L a and L b) the primary ligands and L c was 2,6‐pyridinedicarboxylic acid as secondary ligand. Metal ions used were Fe(II), Co(II), Ni(II) and Zn(II) for mixed ligands L a L c and Fe(II), Co(II), Ni(II), Cu(II), Hg(II) and Zn(II) for L bL c mixed ligands. L a and L b Schiff base ligands were both characterized using elemental analyses, molar conductance, IR, 1H and 13C NMR. Mass spectra for L b, [Zn(L a)L cCl]Cl and [Cu(L b)L cCl]Cl were also studied. ESR spectrum of the [Cu(L b) L cCl]Cl complex was also recorded The metal complexes were synthesized and characterized using elemental analyses, spectroscopic (IR, 1H NMR, UV‐visible, diffused reflectance), molar conductance, magnetic moment and thermal studies. The IR and 1H NMR spectral data revealed that 2,6‐pyridinedicarboxalic acid ligand coordinated to the metal ions via pyridyl N and carboxylate O without proton displacement. In addition, the IR data showed that L a and L b ligands behaved as neutral bidentate ligands with N 2 donation sites (quinoline N and azomethine N for L a and two azomethine N for L b). Based on spectroscopic studies, an octahedral geometry was proposed for the complexes. The thermal stability and degradation of the metal complexes were investigated by thermogravimetric analysis. The binding modes and affinities of L a, L b and Zn(II) complexes towards receptors of crystal structure of E. coli (PDB ID: 3 t88) and mutant oxidoreductase of breast cancer (PDB ID: 3 hb5) receptors were also studied. The antimicrobial activity against two species of Gram positive, Gram negative bacteria and fungi were tested for the Schiff base ligands, 2,6‐pyridinedicarboxylic acid and the mixed ligand complexes and revealed that the synthesized mixed ligand complexes exhibited higher antimicrobial activity than their free Schiff base ligands. 相似文献
8.
Three iso-structural Zn(II), Cd(II), and Hg(II) complexes with 1-benzyl-2-phenyl-1H-benzimidazole (BPB), ZnBPB, CdBPB, and HgBPB, respectively, were synthesized by reaction of the ligand with the corresponding metal chlorides in methanolic solutions. The complexes [MCl 2(BPB) 2], where M?=?Zn(II), Cd(II), or Hg(II), were characterized by elemental analysis, 13C, 1H, and [ 1H– 15N] heteronuclear multiple bond coherence NMR measurements, and Raman spectroscopy. The structures of the cadmium and mercury complexes were solved by single-crystal X-ray diffraction, while the structure of the zinc complex was determined by X-ray powder diffraction. The three compounds crystallize in the triclinic system in P-1 space group with the metal ions lying in a distorted tetrahedral environment. The zinc complex shows high luminescence in the solid state at room temperature. 相似文献
9.
The Co(II), Zn(II), Ni(II), Cu(II), and Fe(II) complexes of 1-phenylbenzimidazole were synthesized and characterized by NMR and elemental analyses. The crystal structures of dichlorobis(1-phenyl-1? H-benzimidazole- κN3 )cobalt(II) and dichlorobis(1-phenyl-1? H-benzimidazole- κN3 )zinc(II) have been determined by single-crystal X-ray diffraction. 相似文献
10.
New bidentate Schiff-base ligands 2-(2,4-di- p-tolyl-3-azabicyclo[3.3.1]nonan-9-ylidene)hydrazinecarbothioamide HL 1 and 2-(2,4-di- p-tolyl-3-azabicyclo[3.3.1]nonan-9-ylidene)hydrazinecarboxamide HL 2 were synthesized from the condensation of 2,4-di- p-tolyl-3-azabicyclo[3.3.1]nonan-9-one with thiosemicarbazide and semicarbazide, respectively. Homoleptic complexes of these ligands, of general formula K[Cr(L n ) 2Cl 2], K 2[Mn(L n ) 2Cl 2], K 2[Fe(L 1) 2Cl 2] and [M(L n ) 2] (where M = Co(II), Ni(II) Cu(II), Zn(II), Cd(II), and Hg(II) ions; n = 1 or 2) are reported. The mode of bonding and overall geometry of the complexes were determined through IR, UV-Vis, NMR and mass spectral studies, magnetic moment measurements, elemental analysis, metal content, and conductance. These studies revealed octahedral geometry for Cr(III), Mn(II), and Fe(II) complexes, square planar for Cu(II), Co(II), and Ni(II) complexes and tetrahedral for Zn(II), Cd(II), and Hg(II) complexes. 相似文献
11.
Six Schiff-bases HL 1-HL 4, L 5 and L 6 [HL 1 = 2,6- bis[1-(2-aminoethyl)pyrolidine-iminomethyl]-4-methyl-phenol, HL 2 = 2,6- bis[1-(2-aminoethyl)piperidine-iminomethyl]-4-methyl-phenol, HL 3 = N-{1-(2-aminoethyl)pyrolidine}salicylideneimine, HL 4 = N-{1-(2-aminoethyl)piperidine}salicylideneimine, L 5 = 2-benzoyl pyridine- N-{1-(2-aminoethyl)pyrolidine}, L 6 = 2-benzoylpyridine- N-{1-(2-aminoethyl)piperidine}] have been synthesized and characterized. Zn(II) complexes of those ligands have been prepared by conventional sequential route as well as by template synthesis. The same complexes are obtained from the two routes as evident from routine physicochemical characterizations. All the Schiff-bases exhibit photoluminescence originating from intraligand (π–π*) transitions. Metal mediated fluorescence enhancement is observed on complexation of HL 1-HL 4 with Zn(II), whereas metal mediated fluorescence quenching occurs in Zn(II) complexes of L 5 and L 6. 相似文献
12.
Five novel coordination polymers, [(Cu(L 1) 2OH) · Cl · 3H 2O] ( 1 ) [L 1 = bis( N‐imidazolyl)methane], [Cd(L 1) 2(NCS) 2] ( 2 ), [Zn(L 1) 2(NCS) 2] ( 3 ), [Cu(L 1) 2(NO 3) 2] ( 4 ), and [Cu(L 2) 1.5(NCS) 2] ( 5 ) [L 2 = 1,4‐bis( N‐imidazolyl)butane] were obtained from self‐assembly of the corresponding metal salts with flexible ligands and their structures were fully characterized by X‐ray diffraction (XRD) analysis, Fourier Transform Infrared (FT‐IR) spectroscopy, elemental analysis and thermogravimetric (TGA) measurements. X‐ray diffraction analyses revealed that complexes 1 , 2 , 3 , and 4 exhibit 1D double‐stranded chain structures, which result from doubly bridged [CuOH], [ M(NCS) 2] ( M = Cd, Zn), and [Cu(NO 3) 2] units, respectively. The polymeric copper complex 5 displays 1D ladder structure., These complexes, with the exception of complex 1 , are stable up to 300 °C. 相似文献
13.
本文通过修饰邻香草醛芳环上羟基的方法,得到两种Schiff碱配体:N,N′-二(2-氧乙酸-3-甲氧基)苄叉乙二胺(H2L1)和N,N′-二(2-氧乙酸-3-甲氧基)苄叉1,3-丙二胺(H2L2),利用水热合成方法以新合成的配体为基点设计合成了2个新的六配位Schiff碱锌(Ⅱ)配合物[Zn(L1)]·7H2O(1)和[Zn(L2)]·7H2O(2),通过元素分析、红外光谱和核磁共振光谱等测试手段对配合物进行了表征,并用X射线单晶衍射测得Zn(Ⅱ)配合物的晶体结构。X射线晶体学研究表明两种配合物晶体结构中都包含多个溶剂水分子,配合物1是以Zn(Ⅱ)为中心扭曲的三方棱柱构型,配合物2是以Zn(Ⅱ)为中心扭曲的八面体构型。初步研究了两种配合物的固体发光性,结果表明这两种配合物具有良好的光致发光的性能,有望在光学材料方面得到应用。 相似文献
14.
Four Co(III), Zn(II), Pd(II) and Cd(II) complexes with ligands derived in situ from acetylpyridine and ethyl hydrazinoacetate or hydrolysed ethyl hydrazinoacetate were prepared. An X-ray structural analysis showed that the Co(III) complex is octahedral with two tridentate ( E)-2-[ N′-(1-pyridin-2-yl-ethylidene)hydrazino]acetate (apha) ligands, each forming two five-membered rings with the metal ion. In the tetrahedral Zn(II) complex, only a single apha ligand was coordinated, in the same way as that in the Co(III) complex. In the case of the tetrahedral Cd(II) complex the non-hydrolysed form of ( E)-2-[ N′-(1-pyridin-2-yl-ethylidene)hydrazino]acetic acid ethyl ester (aphaoet) coordinated as a bidentate and the two remaining coordination sites were occupied by Cl ? and CH 3COO ? ions. In addition, the square-planar neutral Pd(II) complex was synthesized, having the same bidentate as in the Cd(II) complex and two Cl ? ions in the remaining coordination sites. Due to their being diamagnetic, all four complexes were characterized by 1H-NMR and 13C-NMR spectroscopy. 相似文献
15.
本文通过修饰邻香草醛芳环上羟基的方法,得到两种Schiff碱配体: N, N'-二(2-氧乙酸-3-甲氧基)苄叉乙二胺(H 2L 1)和 N, N′-二(2-氧乙酸-3-甲氧基)苄叉1,3-丙二胺(H 2L 2),利用水热合成方法以新合成的配体为基点设计合成了2个新的六配位Schiff碱锌(Ⅱ)配合物[Zn(L 1)]·7H 2O( 1)和[Zn(L 2)]·7H 2O( 2),通过元素分析、红外光谱和核磁共振光谱等测试手段对配合物进行了表征,并用X射线单晶衍射测得Zn(Ⅱ)配合物的晶体结构。X射线晶体学研究表明两种配合物晶体结构中都包含多个溶剂水分子,配合物1是以Zn(Ⅱ)为中心扭曲的三方棱柱构型,配合物 2构型是以Zn(Ⅱ)为中心扭曲的八面体构型。初步研究了两种配合物的固体发光性,结果表明这两种配合物具有良好的光致发光的性能,有望在光学材料方面得到应用。 相似文献
16.
Reactions of hydrated zinc(II) trifluoroacetate and sodium azide with two tridentate Schiff bases HL 1 (2-((E)-(2-(dimethylamino)ethylimino)methyl)-4-chlorophenol) and HL 2 (2-((E)-(2-(dimethylamino)ethylimino)methyl)-4-bromophenol) under the same reaction conditions yielded two dinuclear isostructural zinc(II) complexes, [Zn(L 1)(N 3)] 2 ( 1) and [Zn(L 2)(N 3)] 2 ( 2), respectively. The complexes were characterized systematically by elemental analysis, UV–Vis, FT-IR, and 1H NMR spectroscopic methods. Single-crystal X-ray diffraction studies reveal that each of the dinuclear complexes consists of two crystallographically independent zinc(II) ions connected by double bridging phenoxides. All zinc(II) ions in 1 and 2 are surrounded by similar donor sets and display distorted square–pyramidal coordination geometries. The ligands and complexes reveal intraligand 1( π → π*) flourescence. The enhancement of the fluorescence intensities for the complexes compared to the ligands indicates their potential to serve as photoactive materials. 相似文献
17.
A V-shaped ligand bis( N-methylbenzimidazol-2-ylmethyl)benzylamine ( L) and its zinc(II) complex, [Zn L 2](pic) 2?·?2CH 3CN (pic?=?picrate), have been synthesized and characterized by physico-chemical and spectroscopic methods. Single-crystal X-ray crystallographic analysis revealed that the Zn(II) complex possesses a distorted trigonal bipyramidal geometry. Supramolecular interactions arising from various intra- or intermolecular π···π stacking interactions contributed to the form of the multidimensional configuration. Interactions of L and Zn(II) complex with DNA were monitored using spectrophotometric methods and viscosity measurements. The results suggest that L and Zn(II) complex both bind to DNA via intercalation and Zn(II) complex binds to DNA more strongly than L. Moreover, the Zn(II) complex also exhibited potential antioxidant properties in vitro. 相似文献
18.
A bidentate NO donor Schiff base, 2-(((2-chloro-5- (trifluoromethyl)phenyl)imino)methyl) phenol ( HL 1 ) and its complexes [Co(L 1) 2(H 2O) 2] ( 1 ), [Cu(L 1) 2] ( 2 ), [Mn(L 1) 2(H 2O) 2] ( 3 ), [Ni(L 1) 2(H 2O) 2] ( 4 ), [Pd 2(L 1) 2(OAc) 2·1.16H 2O] ( 5 ), [Pt(L 1) 2] ( 6 ) were synthesized and characterized by different physico-chemical techniques including elemental and thermal analysis, magnetic susceptibility measurements, molar electric conductivity, IR, 1H-NMR, 13C-NMR, UV–Vis, mass spectroscopies and X-ray powder diffraction (XRD). The molecular structures of ligand HL 1 and two complexes ( 2 and 5 ) were confirmed by X-ray crystallography analysis on the monocrystal. In this complexes, the metal ions are in distorted square-planar environments. The copper (II) complex is mononuclear and crystallized in a monoclinic space group P21/c, whereas palladium (II) complex is dinuclear and crystallized in the trigonal crystal system R-3. The toxicity of the ligand and complexes was evaluated on both plant and animal cells, using the plant species Triticum aestivum L. and the crustacean Artemia franciscana Kellogg. At concentrations up to 100 μM the compounds presented very little toxicity on Artemia franciscana Kellogg. Moreover, the palladium (II) complex was devoid of any toxicity on the plant cells. 相似文献
19.
Eight new macrocyclic complexes were synthesized by template reaction of 1,4-bis(3-aminopropoxy)butane or (±)-trans-1,2-diaminocyclohexane
with metal nitrate and 1,2-bis(2-formylphenyl)ethane and their structures were proposed on the basis of elemental analysis,
FT-IR, UV-Vis, molar conductivity measurements, 1H NMR and mass spectra. The metals to ligand molar ratios of the complexes were found to be 1: 1. The complexes are 1: 2 electrolytes
for Cd(II), Pb(II) and Zn(II) complexes and 1: 3 electrolytes for La(III) as shown by their molar conductivities (Λ m) in DMSO at 10 −3 mol L −1. Due to the existence of free ions in these complexes, such complexes are electrically conductive. The configurations of
Cd(II) and Zn(II) complexes were proposed to probably tetrahedral, La(III) complexes are octahedral and Pb(II) complexes are
octahedral geometry in the L 1 complex and tetrahedral geometry in the L 2 complex. 相似文献
20.
A new vic-dioxime 1,4,7-oxadithiononane-5,6-dionedioxime ( H2L) was prepared from reaction of 2,2-oxydiethanthiol with dichloroglyoxime. Mononuclear complexes of H2L with Ni(II), Co(II), Cu(II), Zn(II), and Cd(II) were also prepared and their structures were determined by means of 1H?NMR, 13C?NMR, IR, and mass spectroscopy. Ni(II), Co(II), and Cu(II) form square planar complexes of 1?:?2 molar ratio of metal to ligand through N,N-chelation, while Zn(II) and Cd(II) form 1?:?1 tetrahedral complexes with a N,O-chelation. 相似文献
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