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1.
Three new complexes, {[Cu 3(2,3-pyma) 2(sip) 2(H 2O) 5]·5H 2O} n , {[Zn(H-2,3-pyma)(sip)(H 2O)]·H 2O} n , and {[Cd(H-2,3-pyma)(sip)(H 2O)]·H 2O} n (2,3-pyma = (2-pyridylmethyl,3-pyridylmethyl)amine and H 3sip = 5-sulfoisophthalic acid) were synthesized and structurally characterized by single-crystal X-ray diffraction. The Cu(II) complex crystallizes in neutral two-dimensional layers in which the Cu(II) centers are bridged by both the flexible 2,3-pyma and the rigid sip ligands. The Zn(II) and Cd(II) complexes contain neutral one-dimensional chains linked by the rigid sip anions, whereas the flexible H-2,3-pyma ions only act as terminal ligands. The Cu(II) complex shows weak antiferromagnetic interactions, while the Zn(II) and Cd(II) complexes exhibit fluorescent emissions in the solid state. 相似文献
2.
Hydrazinium metal ethylenediaminetetraacetate complexes of molecular formula (N 2H 5) 2[Mg(edta)·H 2O], (N 2H 5) 3[Mn(edta)··H 2O](NO 3)·H 2O, N 2H 5[Fe(edta)·H 2O], N 2H 5[Cu(Hedta)·H 2O] and N 2H 5[Cd(Hedta)·H 2O]·H 2O have been synthesized and characterized by elemental and chemical analysis, conductivity and magnetic measurements and spectroscopic
techniques.
The thermal behaviour of these complexes has been studied by thermogravimetry and differential thermal analysis. The data
set provided by the simultaneous TG-DTA curves of the complexes shows the occurrence of three or four consecutive steps such
as dehydration, ligand pyrolysis and formation of metal oxides. X-ray powder diffraction patterns of copper and cadmium complexes
show that they are not isomorphous. These studies suggest seven coordination for Mg,Mn, Fe complexes and six coordination
for Cu and Cd derivatives. 相似文献
3.
New series of manganese(III) complexes and amino acid Schiff bases have been prepared from 2-hydroxy-1-naphthaldehyde and α-amino acids [ L-aspartic acid (Asp), L-asparagine (Asn), L-glutamic acid (Glu) and L-glutamine (Gln)]. The structures of the ligands and manganese complexes were identified using elemental analyses, i.r, electronic spectra, 1H-n.m.r spectra, magnetic moment measurements and thermogravimetric analyses (t.g.a). The results suggest that H 2L 1: [ N-(2-hydroxy-1-naphthylidene) aspartic acid] and H 2L 3: [ N-(2-hydroxy-1-naphthylidene)glutamic acid] Schiff bases behave as trianionic tetradentate species and coordinate to Mn(III) ion according to the general formula [MnL] · xH 2O complexes. But, H 2L 2: [ N-(2-hydroxy-1-naphthylidene) asparagine] and H 2L 4: [ N-(2-hydroxy-1-naphthylidene)glutamine] Schiff bases behave as dianionic tridentate and coordinate to Mn(III) ion in the general formula for [MnL(OOCH 3)] · xH 2O complexes. 相似文献
4.
The present work describes the preparation and characterization of some metal ion complexes derived from 4-formylpyridine- 4 N-(2-pyridyl)thiosemicarbazone (HFPTS). The complexes have the formula; [Cd(HFPTS) 2H 2O]Cl 2, [CoCl 2(HPTS)]·H 2O, [Cu 2Cl 4(HPTS)]·H 2O, [Fe (HPTS) 2Cl 2]Cl·3H 2O, [Hg(HPTS)Cl 2]·4H 2O, [Mn(HPTS)Cl 2]·5H 2O, [Ni(HPTS)Cl 2]·2H 2O, [UO 2(FPTS) 2(H 2O)]·3H 2O. The complexes were characterized by elemental analysis, spectral (IR, 1H-NMR and UV–Vis), thermal and magnetic moment measurements. The neutral bidentate coordination mode is major for the most investigated complexes. A mononegative bidentate for UO 2(II), and neutral tridentate for Cu(II). The tetrahedral arrangement is proposed for most investigated complexes. The biological investigation displays the toxic activity of Hg(II) and UO 2(II) complexes, whereas the ligand displays the lowest inhibition activity toward the most investigated microorganisms. 相似文献
5.
Tris[2-( N-ethyl)benzimidazylmethyl]amine (Etntb) and two of its complexes, [Zn(Etntb)(cinnamate)]NO 3·2DMF (1) and [Ni(Etntb)(cinnamate)·(H 2O)]NO 3 (2) have been synthesized and characterized by physico-chemical and spectroscopic methods. Single-crystal X-ray diffraction revealed that the complexes have different structures. In complex 1, the coordination sphere around Zn(II) is distorted trigonal bipyramidal, whereas the coordination sphere around Ni(II) is distorted octahedral in complex 2. The DNA-binding properties of the free ligand and its complexes have been investigated by electronic absorption, fluorescence, and viscosity measurements. The results suggest that the ligand and both complexes bind to DNA via an intercalative mode, and their binding affinity for DNA follows the order 1 > 2> ligand. 相似文献
6.
Novel mononuclear oxovanadium(IV) and manganese(III) complexes [VO(L 1) 2·H 2O] ( 1); [VO(L 2) 2·H 2O] ( 2); [VO(L 3) 2·H 2O] ( 3); [Mn(L 1) 2]ClO 4·H 2O ( 4); [Mn(L 2) 2] ClO 4·H 2O ( 5); [Mn(L 3) 2]ClO 4·H 2O ( 6) were prepared by condensation of 1 mol of VOSO 4·5H 2O or Mn(OAc) 3· 2H 2O with 2 mol of ligand HL 1, HL 2 or HL 3 (where HL 1 = 4-[(2-hydroxy-ethylamino)-methylene]-5-methyl-2- phenyl-2,4-dihydro-pyrazol-3-one; HL 2=4-[(2-hydroxy-ethylamino)-methylene]-5-methyl-2- p-tolyl-2,4-dihydro-pyrazol-3-one; HL 3=4-{4-[(2-hydroxy-ethyl-amino)-methyl]-3-methyl-5-oxo-4,5-dihydropyrazol-1-yl} benzene sulfonic acid). The resulting complexes
were characterized by elemental analyses, molar conductance, magnetic and decomposition temperature measurements, electron
spin resonance, FAB mass, IR and electronic spectral studies. From TGA, DTA and DSC, the thermal behaviour and degradation
kinetic were studied. Electronic spectra and magnetic susceptibility measurements indicate distorted octahedral stereochemistry
of oxovanadium(IV) complexes and regular octahedral stereochemistry of manganese(III) complexes. Hamiltonian and bonding parameters
found from ESR spectra indicate the metal ligand bonding is partial covalent. The X-ray single crystal determination of one
of the representative ligand was carried out which suggests existence of amine-one tautomeric form in the solid state. The
1H-NMR spectra support the existence of imine-ol form in solution state. The LC-MS studies sustain the 1H-NMR result. The electronic structure of the same representative ligand was optimized using 6-311G basis set at HF level
ab initio studies to predict the coordinating atoms of the ligand. 相似文献
7.
Copper(II) hydrazine carboxylate monohydrate, Cu(N 2H 3COO) 2·H 2O and chromium (II, III) hydrazine carboxylate hydrates, Cu(N 2H 3COO) 2·H 2O and Cu(N 2H 3COO) 2·3H 2O have been prepared and characterised by chemical analysis, IR, visible spectra and magnetic measurements. Thermal analysis
of the copper complex yields a mixture of copper metal and copper oxide. Chromium complexes on thermal decomposition yield
Cr 2O 3 as residue. Decomposition of chromium(HI) complex under hydrothermal conditions yield CrOOH, a precursor to CrO 2. 相似文献
8.
New mixed-ligand complexes with empirical
formulae: Mn(2-bpy) 1.5L 2·2H 2O,
M(2-bpy) 2L 2·3H 2O
( M(II)=Co, Cu), Ni(2-bpy) 3L 2·4H 2O
and M(2,4’-bpy) 2L 2·2H 2O
(where 2-bpy=2,2’-bipyridine, 2,4’-bpy=2,4’-bipyridine; L=HCOO – ) have been
obtained in pure solid-state. The complexes were characterized by chemical
and elemental analysis, IR and VIS spectroscopy, conductivity (in methanol
and dimethylsulfoxide). The way of metal-ligand coordination discussed. The
formate and 2,4’-bpy act as monodentate ligands and 2-bpy as chelate
ligand. The new complexes with ligand isomerism were identified. During heating
the complexes lose water molecules in one or two steps. Thermal decomposition
after dehydration is multistage and yields corresponding metal oxides as final
products. A coupled TG-MS system was used to analysis principal volatile thermal
decomposition (or fragmentation) products of Ni(2,4’-bpy) 2(HCOO) 2·2H 2O under dynamic air or argon atmosphere. 相似文献
9.
Synthesis, spectroscopic characterization, theoretical and antimicrobial studies of Ca(II), Fe(III), Pd(II), and Au(III) complexes of amoxicillin (amox) antibiotic drug are presented in the current paper. Structure of 1: 1 (metal: amox) complexes were elucidated on the basis of elemental analyses, and IR, Raman, 1H NMR, and electronic spectral data. According to molar conductance measurements the complexes had electrolyte nature. Amoxicillin reacted with metal ions as a tridentate ligand coordinated with metal ions via–NH 2,–NH, and β-lactam carbonyl groups. The complexes were formulated as [Ca(amox-Na)(H 2O)]·Cl 2·4H 2O ( 1), [Fe(amox-Na)(H 2O) 3]·Cl 3·3H 2O ( 2), [Pd(amox-Na)(H 2O)]·Cl 2 ( 3), and [Au(amox-Na)(H 2O)]·Cl 3 ( 4). Kinetic thermodynamic parameters ( E*, Δ S*, Δ H*, and Δ G*) were calculated based on the Coats–Redfern and Horowitz–Metzger methods using thermo gravimetric curves of TG and DTG. Nanosize particles of amoxicillin complexes have been studied by XRD, SEM, and TEM methods. Theoretical studies of the synthesized complexes have been performed. 相似文献
10.
( E)-4-(4-Methoxyphenoxy)-4-oxobut-2-enoic acid and its Ce(IV), Th(IV), and UO 2(II) complexes were synthesized and characterized by MS, elemental analysis, IR, UV, TG-DTA, and NMR. The complexes have composition [CeL 2(OH) 2 · 2H 2O] · H 2O, [ThL 2(OH) 2 · 2H 2O] · H 2O, and [UO 2L 2 · 2H 2O] · H 2O. Molar conductance data confirm that the three complexes are nonelectrolytes. The IR and NMR results show that the carboxylates coordinate to the metal ions bidentate, and the ester carboxylic groups do not take part in coordination. Luminescence spectra of the ligand and complexes in DMSO at room temperature were also studied showing strong luminescence of the metal ions. 相似文献
11.
A new macrocyclic ligand, 1,3,5-triaza-2,4:7,8:19,20-tribenzo-9,12,15,18-tetraoxacyclounkosa-1,5-diene (L) was synthesized
by reaction of 2,6-diaminopyridine and 1,10-bis(2-formylphenyl)-1,4,7,10-tetraoxadecane. Then, its Cu II, Ni II, Pb II, Co III and La III complexes were synthesized by the template effect by reaction of 2,6-diaminopyridine and 1,10-bis(2-formylphenyl)-1,4,7,10-tetraoxadecane
and Cu(NO 3) 2· 3H 2O, Ni(NO 3) 2· 6H 2O, Pb(NO 3) 2, Co(NO 3) 2· 6H 2O, La(NO 3) 3·6H 2O respectively. The ligand and its metal complexes have been characterized by elemental analysis, IR, 1H and 13C NMR, u.v–vis spectra, magnetic susceptibility, conductivity measurements and mass spectra. All complexes are diamagnetic
and the Cu II complex is binuclear. The Co III complex was oxidized to Co III. 相似文献
12.
New compounds with formulae Y(2,4′-bpy)1.5Cl3·8H2O (I), Y(2,4′-bpy)0.5Br3·8H2O (II), La(2,4′-bpy)Cl3·5H2O (III) and La(2,4′-bpy)1.5Br3·5H2O (IV) were prepared and characterized by chemical and elemental analysis, IR spectroscopy and powder X-ray diffraction. The thermal properties of compounds in the solid state were studied using TG-DTA techniques under dry air atmosphere. The thermal behavior of investigated compounds was studied in the temperature range 298–1273 K. They are stable up to 323 K. The complexes decompose in several stages, accompanied by endo- and exothermic effects. In all cases, the first step of pyrolysis is partial or total dehydration. When the temperature rises, deamination takes place. The solid final products of decomposition are Y2O3 and La2O3, respectively. Additionally, for all complexes mass spectrometry was used to analyze principal volatile thermal decomposition and fragmentation products evolved during pyrolysis under dry air atmosphere. 相似文献
13.
Two d 10 metal complexes, {[Zn(Hbtc)(bmt)]·DMF·5H 2O} n ( 1) and {[Cd(Hbtc)(bmt)]·0.5DMF·0.5H 2O} n ( 2) (H 3btc?=?1,3,5-benzenetricarboxylic acid, bmt?=?2-((benzoimidazol-yl)methyl)-1 H-1,2,4-triazole), have been synthesized under solvothermal conditions by employing bmt and H 3btc. Single-crystal X-ray diffraction shows that Zn(II) ions are connected by bmt with bidentate-bridging coordination and by 1,3,5-benzenetricarboxylate with bis-monodentate coordination leading to the 2D structure of 1. Complex 2 exhibits a 2D layer structure, in which bmt coordinate tridentate-bridging to Cd(II) and 1,3,5-benzenetricarboxylates coordinate to Cd(II) unidentate/chelating. Photoluminescence and thermogravimetric analyses of the two complexes are investigated. 相似文献
14.
New bidentate amino-phosphoroamidite and diphosphoroamidite ligands derived from inexpensive ( R, R)-1,2-diaminocyclohexane have been synthesized and screened in the Cu-catalyzed asymmetric conjugate addition of Et 2Zn to 2-cyclohexenone. The highest 74% ee value was reached with the N, N′-dimethyl substituted P, N-ligand and Cu(OAc) 2·H 2O. 相似文献
15.
The Trihydrochloride Monohydrate of N -(Pyrid-2-ylmethyl)ethylenediamine- N , N′ , N′ -triacetic Acid and its Lanthanum(III) Complex We report the results of the investigation of N-(pyrid-2-ylmethyl)ethylenediamine- N, N′, N′-triacetic acid (H 3pedta) and its complexes with rare earth metal ions. The X-ray crystal structures of H 3pedta · 3 HCl · H 2O and of the lanthanum(III) complex [La(pedta)(H 2O)] · 2 H 2O were determined. The complex forms a polymer, lanthanum(III) has coordination number 10, one water molecule is coordinated. The water degradation of H 3pedta · 3 HCl · H 2O and of the complex was investigated by thermoanalysis. Luminescence studies of the corresponding europium(III) complex in aqueous solution show three coordinated water molecules. 相似文献
16.
Complexes of Co(II), Ni(II), Cu(II), Cd(II), Zn(II) and U(IV)O 2 with ( Z)-2-oxo-2-(2-(2-oxoindolin-3-ylidene)hydrazinyl)- N-phenylacetamide (H 2OI) are reported and have been characterized by various spectroscopic techniques like (IR, UV–Vis, ESR 1H and 13C NMR) as well as magnetic and thermal (TG and DTA) measurements. It is found that the ligand behaves as a neutral tridentate, neutral tetradentate, monoanionic tridentate, monoanionic tridentate and dianionic tridentate. An octahedral geometry for all complexes except [Cu 2(H 2OI)(OAc) 4](H 2O) 2 and [Cu(HOI)Cl](H 2O) 2 which have a square planar geometry. Furthermore, kinetic parameters were determined for each thermal degradation stage of some studied complexes using Coats–Redfern and Horowitz–Metzger methods. The bond lengths, bond angles, HOMO, LUMO and dipole moments have been calculated to confirm the geometry of the ligand and the investigated complexes. 相似文献
17.
New VO 2+, Mn 2+, Co 2+, Ni 2+ Cu 2+ and Zn 2+ complexes of 2,5-hexanedione bis(isonicotinylhydrazone) [H 2L] have been synthesized and characterized. The analyses confirmed the formulae: [VO(L)]·H 2O, [Mn 2(H 2L)Cl 2(H 2O) 6]Cl 2, [Co(L)(H 2O) 2]·2H 2O, [Ni(HL)(OAc)]·H 2O, [Cu(L)(H 2O) 2]·2H 2O, [Cu(L)]·2H 2O and [Zn(L)(H 2O) 2]. The formulae of [Ni(HL)(OAc)]·H 2O, [Zn(L)(H 2O) 2] and [Mn 2(H 2L)Cl 2(H 2O) 6]Cl 2, are supported by mass spectra. The molecular modeling of H 2L is drawn and showed intramolecular hydrogen bonding. The ligand releases two protons during reaction from the two amide groups (NHCO) and behaves as a binegative tetradentate (N 2O 2); good evidence comes from the 1H NMR spectrum of [Zn(L)(H 2O) 2]. The ligand has a buffering range 10–12 and p K's of 4.62, 7.78 and 9.45. The magnetic moments and electronic spectra of all complexes provide a square-planar for [Cu(L)]·2H 2O, square-pyramidal for [VO(L)]·H 2O and octahedral for the rest. The ESR spectra support the mononuclear geometry for [VO(L)]·H 2O and [Cu(L)(H 2O) 2]·2H 2O. The thermal decomposition of the complexes revealed the outer and inner solvents where the end product in most cases is metal oxide. 相似文献
18.
Two new palladium(II) complexes with 5-methyl-5-(4-pyridyl)-2,4-imidazolidenedione(mpyh) were synthesized: cis-[Pd(mpyh) 2Cl 2]·H 2O and cis-[Pd(mpyh) 2Br 2]·2H 2O. The molecular formulae of the complexes were confirmed by elemental analysis, IR, 1H NMR spectra and DTA study. The ligand is coordinated to the palladium ion with N-atom of the pyridine ring. The spectroscopic
data indicate a square planar geometry with two N-pyridine atoms and two halogene anions in cis position. The final product of the thermal decomposition of cis-[Pd(mpyh) 2Cl 2]·H 2O is metallic Pd, whereas for cis-[Pd(mpyh) 2Br 2]·2H 2O the residue consists of metallic Pd and C. The cytotoxic effects of the complexes were examined in vitro on some human tumor
cell lines. The cis-[Pd(mpyh) 2Cl 2]·H 2O proved to be more active as compared to the cis-[Pd(mpyh) 2Br 2]·2H 2O. 相似文献
19.
The trivalent ruthenium, rhodium and iridium complexes of dipicolinic acid and its mixed ligand complexes with several nitrogen, oxygen donor molecules, of types: Na[M(dipic) 2]·2H 2O and [M(dipic)(N-O)]· nH 2O (where M = Ru(III), Rh(III) or Ir(III); dipicH 2 = dipicolinic acid; NOH represents different nitrogen, oxygen donor molecules, viz., picolinic acid, nicotinic acid, isonicotinic acid, glycine, aminophenol, o- or p-aminobenzoic acid), have been synthesized and characterised on the basis of elemental analyses, electrical conductance, magnetic susceptibility measurements and spectral (electronic and infrared) data. The parent dipicolinic acid complexes are found to have a six-coordinate pseudooctahedral structure, whereas for mixed ligand complexes, a polymeric six-coordinate structure has been assigned. Various ligand field and nephelauxetic parameters have also been evaluated. 相似文献
20.
Seven new mononuclear complexes have been synthesized from 2,4-diiodo-6-propyliminomethyl-phenol in pyridine and Cu(OAc) 2 · H 2O, Ni(OAc) 2 · 4H 2O, Co(OAc) 2 · 4H 2O, Zn(OAc) 2 · 2H 2O, Cd(OAc) 2 · 2H 2O, Mn(OAc) 2 · 4H 2O, and Hg(OAc) 2. The complexes were characterized by UV, IR, ESI-MS, and elemental analyses; bis(2,4-diiodo-6-propyliminomethyl-phenol)-pyridine-copper(II) ( 1) was characterized by X-ray crystallography. The central metal in each complex is five-coordinate by two nitrogens and two oxygens from two 3,5-diiodosalicylaldehyde Schiff-base ligands and one nitrogen from pyridine. The 3,5-diiodosalicylaldehyde Schiff base is bidentate. All the complexes were assayed for antibacterial ( Bacillus subtilis, Staphylococcus aureus, Streptococcus faecalis, Pseudomonas aeruginosa, Escherichia coli, and Enterobacter cloacae) activities by the MTT method. Complex 1 showed the most favorable antimicrobial activity with minimum inhibitory concentrations of 6.25, 3.125, 6.25, 3.125, 6.25, 3.125 µg mL ?1 against B. subtilis, S. aureus, S. faecalis, P. aeruginosa, E. coli, and E. cloacae, respectively. 相似文献
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