Synthesis and characterisation of Cu(II), Ni(II), Mn(II), Zn(II) and VO(II) Schiff base complexes derived fromo-phenylenediamine and acetoacetanilide (original) (raw)
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Solid metal complexes of Co(II), Ni(II),and Cu(II) have been preparation and characterization using anew Schiff base (ANPHA) derived from anew azo dye were β-[(p-(Nitrophenyl)azo] diketonilide and 4-aminoantipyrine were characterized by several techniques, including elemental analysis (C.H.N), molar conductance, magnetic measurements, electronic spectral and IR spectral studies. The data show that these complexes have composition of [ML 2 ] type. The electronic spectral, and magnetic susceptibility data of the complexes suggest octahedral geometry of all complexes, and the ligand (ANPHA) behaves mono basic tridentate manner, by coordination through the azomethine nitrogen atom and oxygen groups.
Journal of Coordination Chemistry, 2003
Cu(II), Ni(II) and Zn(II) complexes with the Schiff base derived from 1,2-bis-(o-aminophenoxy)ethane with salicylaldehyde have been prepared. The complexes have been characterized by elemental analysis, magnetic measurements, 1 H NMR, 13 C NMR, UV, visible and IR spectra as well as conductance measurements. The ligand is coordinated to the central metal as a tetradentate ONNO ligand. The four bonding sites are the central azomethine nitrogen and aldehydic OH groups. The ligand was used for complexation studies. Stability constants were measured by a conductometric method. Furthermore, the stability constants for complexation between ZnCl 2 and Cu(NO 3) 2 salts and N,N 0-bis(salicylidene)-1,2-bis-(o-aminophenoxy)ethane (H 2 L) in 80% dioxane/water and pure methanol were determined from conductance measurements. The magnitudes of these ion association constants are related to the nature of the solvation of the cation and the complexed cation. The mobilities of the complexes are also dependent, in part, upon solvation effects.
Journal of Coordination …, 2003
Cu(II), Ni(II) and Zn(II) complexes with the Schiff base derived from 1,2-bis-(o-aminophenoxy)ethane with salicylaldehyde have been prepared. The complexes have been characterized by elemental analysis, magnetic measurements, 1 H NMR, 13 C NMR, UV, visible and IR spectra as well as conductance measurements. The ligand is coordinated to the central metal as a tetradentate ONNO ligand. The four bonding sites are the central azomethine nitrogen and aldehydic OH groups. The ligand was used for complexation studies. Stability constants were measured by a conductometric method. Furthermore, the stability constants for complexation between ZnCl 2 and Cu(NO 3) 2 salts and N,N 0-bis(salicylidene)-1,2-bis-(o-aminophenoxy)ethane (H 2 L) in 80% dioxane/water and pure methanol were determined from conductance measurements. The magnitudes of these ion association constants are related to the nature of the solvation of the cation and the complexed cation. The mobilities of the complexes are also dependent, in part, upon solvation effects.
Synthesis and Reactivity in Inorganic and Metal-organic Chemistry, 2003
Cu(II), Co(II), Ni(II) and Zn(II) metal complexes of a new heterocylic Schiff base derived from 1-amino-5-benzoyl-4-phenyl-1H-pyrimidine-2one with 3-hydroxy-salicylaldehyde have been synthesized and characterized on the basis of elemental analyses, electronic, IR and 1 H NMR spectra, molar conductivity measurements, magnetic moment measurements and thermogravimetric analyses (TGA). It has been found that the Schiff base behaves as a neutral bidentate (NO) or tridentate (ONO) ligand forming chelates with 1:2 (metal:ligand) stoichiometry and
Spectrochimica Acta Part A: Molecular and …, 2008
The Benzothiazol-2-yl-(4-chloro-benzylidene)-amine was prepared by the reaction of 2aminobenzothiazole with 4-chlorobenzaldehyde, the prepared ligand was identified by Micro elemental Analysis, FT.IR and UV-Vis spectroscopic techniques. Treatment of the prepared ligand with the following selected metal ions (Co(II),Ni(II),Cu(II) and Zn(II)) in aqueous ethanol with a 1:2 M:L ratio, yielded a series of complexes of the general formula [M(L) 2 Cl 2 ]. The prepared complexes were characterized using flame atomic absorption, (C.H.N) Analysis, FT.IR and UV-Vis spectroscopic methods as well as magnetic susceptibility and conductivity measurements. From the obtained data the octahedral structure was suggested for all prepared complexes.
Applied Organometallic Chemistry, 2019
Coordination compounds of Cu (II), Y (III), Zr (IV) and La (III) with the tetradentate Schiff base (H 2 L) obtained through the condensation of pphenylenediamine with salicylaldehyde under reflux conditions. The complexes were characterized by elemental analysis, magnetic susceptibility, molar conductance and also, with various spectroscopic techniques such as 1 H NMR, UV-Vis., IR and XRD techniques. Electrolytic nature of complexes was ascertained by molar conductance values. In these four complexes, the ligand chelates act in a tetradentate manner via azomethine nitrogen and oxygen atoms of phenolic groups. Electronic spectroscopic data are in agreement with an octahedral geometrical structure. Thermal degradation analyses in nitrogen gas were used to investigate the number and location of water molecules. The chemical formulae of metal complexes were confirmed by microanalytical data. The activation thermodynamic parameters, such as, E * , ΔH * , ΔS * and ΔG * were calculated from the DTG curves using Coats Redfern (CR) and Horowitz-Metzeger (HM) methods at n = 1 or n ≠ 1. Nematicidal activities indicate that the ligand exhibit greater activity when compared to its complexes. In addition metal complexes displayed good moderate nematicidal activities.
Four new Schiff base complexes derived from Ni(II), Cu(II), Rh(III), and Pt(IV) with 4-dimethylaminobenzaldehyde and 4-aminoantipyrine were prepared and investigated using some elemental analysis such as molar conductivity measurements, thermogravimetric analysis, magnetic moments, infrared, electronic and mass spectra. The elemental analysis for C, H, and N showed the formation of 1:1[M:L] complexes. The molar conductivity measurements revealed that the complexes are nonelectrolyte in nature. The thermogravimetric analysis data exhibited the presence of coordinated and hydrated water molecules. The magnetic moment results showed paramagnetic phenomena for nickel and copper complexes and diamagnetic phenomena for Rhodium and platinum complexes. The infrared spectral data of the prepared complexes displayed the proper coordination sites of the present Schiff base towards the metal ions. The electronic absorption spectral data of the prepared complexes confirmed the electronic transit...
Polyhedron, 2006
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