scholarly journals Preparation and Spectral Properties of Mixed-Ligand Complexes of VO(IV), Ni(II), Zn(II), Pd(II), Cd(II) and Pb(II) with Dimethylglyoxime andN-acetylglycine

2010 ◽  
Vol 7 (s1) ◽  
pp. S580-S586 ◽  
Author(s):  
Shayma A. Shaker
Keyword(s):  
Metal Ions ◽  
Electronic Spectra ◽  
Nmr Spectra ◽  
Magnetic Moments ◽  
Visible Region ◽  
Mixed Ligand ◽  
Mixed Ligand Complexes ◽  
Carboxyl Oxygen Atom ◽  
Absorption Bands ◽  
C Nmr

A number of mixed-ligand complexes of the general formula [M(D)(G)] where D=dimethylglyoximato monoanion, G=N-acetylglycinato and M=VO(IV), Ni(II), Zn(II), Pd(II), Cd(II) and Pb(II) were prepared. Each complex was characterized by elemental analysis, determination of metal, infrared spectra, electronic spectra, (1H and13C) NMR spectra, conductivity and magnetic moments. All these complexes were not soluble in some of the organic solvent but highly soluble in dimethylformamide. The conductivity data showed the non-electrolytic nature of the complexes. The electronic spectra exhibited absorption bands in the visible region caused by the d-d electronic transition such as VO(IV), Ni(II) and Pd(II). The IR and (1H,13C) NMR spectra which have indicate that the dimethylglyoxime was coordinated with the metal ions through the N and O atoms of the oxime group andN-acetylglycine was coordinated with metal ions through the N atom and terminal carboxyl oxygen atom.

Electrooxidation of 2-arylfurans

1981 ◽  
Vol 46 (4) ◽  
pp. 906-916 ◽  
Author(s):  
Miroslav Janda ◽  
Jan Šrogl ◽  
Hana Dvořáková ◽  
Dalimil Dvořák ◽  
Ivan Stibor
Keyword(s):  
Electronic Spectra ◽  
Nmr Spectra ◽  
Model Compounds ◽  
Methyl Group ◽  
C Nmr

Electrochemical methoxylation of 2-phenylfuran (I) and 2-(4-nitrophenyl)furan (VI) proceeded anomalously, affording 5-methoxy-2-phenylfuran (XI) and 5-methoxy-2-(4-nitrophenyl)furan (XIII), respectively. 2-Phenyl-5-methylfuran (II) and methyl-2-(2-methylphenyl)-3-furoate (VIII) behaved normally giving the respective 2,5-dimethoxy-2,5-dihydrofuran derivatives XII and XIV. The suggested ECNECB mechanism of the anomalous methoxylation was confirmed by methoxylation of compound II, in which the methyl group hinders the last CB step, and also of compound VIII in which the automaticity is suppressed by forced deviation from planarity. Forced deviation from planarity was moreover studied also on 2-(4-methylphenyl)furan (III), 5-methyl-2-(2-methylphenyl)furan (IV) and 3,5-dimethyl-2-(2-methylphenyl)furan (V) as model compounds. For all the derivatives the INDO charges were calculated and correlated with the 1H- and 13C-NMR spectra. The experimental electronic spectra were correlated with the theoretical ones (INDO-S-CI). All the results obtained confirm the suggested mechanism.

scholarly journals Synthesis and Spectroscopic Studies of New Palladium(II) Complexes of N-hydroxymethyl Saccharin (Sac-CH2OH) and Amines or Diaminas Ligands

2019 ◽  
Vol 35 (1) ◽  
pp. 186-192 ◽  
Author(s):  
Ahmed S. Al-Janabi ◽  
Adnan A. Al-Dulaimi ◽  
Hayfa M. Gergees ◽  
Mohammed H. Saleh
Keyword(s):  
1H Nmr ◽  
Nmr Spectra ◽  
Spectroscopic Studies ◽  
Mixed Ligand ◽  
1H Nmr Spectra ◽  
Ethylene Diamine ◽  
Mixed Ligand Complexes ◽  
Conductivity Measurements

Treatment of the chelated palladium(II) complex, trans-[Pd(K2-Sac-CH2O)2].2H2O with one mole equivalent of the diammines (L-L), L-L = 2,2'-bipyridine (bipy),. ethylene diamine (en), 1,10-phenanthroline (phen), or N,N-dimethyl ethylene diammine (dmen) in EtOH solvent afforded mixed ligand complexes of the type [Pd(K1-Sac-CH2O)2(L-L)] in 82-93% yield. While treatment of trans-[Pd(K2-Sac-CH2O)2].2H2O with two mole equivalents of the monoamines (L), L=pyridine (py), 3-methylpyridine (3-mpy) or 3-aminopyridine (3-apy) in EtOH solvent gave trans-[Pd(K1-Sac-CH2O)2(L)2] complexes in 86-89% yield The prepared complexes were characterized by elemental CHN analysis, .conductivity measurements,. infrared and 1H nmr spectra.

scholarly journals Preparation and Study of Some Mn(II), Co(II), Ni(II), Cu(II), Cd(II) and Pb(II) Complexes Containing Heterocyclic Nitrogen Donor Ligands

2010 ◽  
Vol 7 (4) ◽  
pp. 1598-1604 ◽  
Author(s):  
Shayma A. Shaker
Keyword(s):  
Metal Ions ◽  
Molar Conductivity ◽  
Mixed Ligand ◽  
Donor Ligands ◽  
Nitrogen Donor Ligands ◽  
Molar Ratios ◽  
Nitrogen Donor ◽  
Uv Visible ◽  
C Nmr

This paper presents a new mixed-ligand complexes with the general formula [M(BT)(BI)2X2] where BT=benzotriazole, BI=benzimidazole, X=SCN and M=Mn(II), Co(II), Ni(II), Cu(II), Cd(II) and Pb(II). The reaction was carried out by using the appropriate molar ratios of metal:ligand (1:1:2:2) (M:BT:BI:X) as required. The resulting products were found to be solids, not soluble in water and in ordinary organic solvents but highly soluble in DMSO. These complexes have been studied by UV-visible, IR and (1H,13C) NMR spectra, molar conductivity, elemental analysis of C, H, N, determination of metal and magnetic susceptibility. The result suggests that the benzimidazoleas as a monodentate was coordinated with the metal ions through the N atom. Nevertheless, the benzotriazole as bidentate was coordinated with the metal ions through the N2 and N3 atoms. SCN was coordinated with the metal ions through the nitogen atom.

f-f spectral studies of holmium(III) complexes

1983 ◽  
Vol 36 (4) ◽  
pp. 695 ◽  
Author(s):  
K Iftikhar ◽  
N Ahmad
Keyword(s):  
Coordination Number ◽  
Oscillator Strength ◽  
Magnetic Moment ◽  
Visible Region ◽  
Mixed Ligand ◽  
Oscillator Strengths ◽  
Mixed Ligand Complexes ◽  
Spectral Studies ◽  
Nitrogen Donors ◽  
Covalency Parameters

Holmium(III) mixed-ligand complexes containing ligands having oxygen and nitrogen donors have been spectrophotometrically investigated. The observed spectra in the visible region have been analysed to calculate covalency parameters (β, b� and δ), oscillator strengths and Judd-Ofelt parameters. The degree of covalency in the complexes increases with increase in coordination number. The hypersensitivity is correlated with the degree of covalency and number of coordinated ligands. The higher values of covalency parameters, oscillator strength and magnetic moment in the ten-coordinate HoIII is taken as evidence of participation of f-orbitals in bonding.

scholarly journals The effect of alkali metal ions on the electronic structure ofp-anisic acid1

2010 ◽  
Vol 24 (5) ◽  
pp. 449-459 ◽  
Author(s):  
M. Kalinowska ◽  
R. Świsłocka ◽  
E. Regulska ◽  
W. Lewandowski
Keyword(s):  
Metal Ions ◽  
Nmr Spectra ◽  
Alkali Metal Ions ◽  
Electronic Charge ◽  
Sodium Potassium ◽  
Electronic Charge Distribution ◽  
Anisic Acid ◽  
Ft Ir ◽  
C Nmr ◽  
Ft Raman

FT-IR (in solid state and solution), FT-Raman, UV and1H,13C NMR spectra of p-methoxybenzoic (p-anisic) acid and lithium, sodium, potassium, rubidium and caesiump-methoxybenzoates (p-anisates) were registered, assigned and analyzed. The structures of anisic acid and Li, Na and Kp-anisates were optimised at the B3LYP/6-311++G** level. The IR spectra and NPA, ChelpG and MK atomic charges were calculated. The effect of metal ions on the electronic charge distribution in ligand was discussed.

Kinetics of the reaction of p-dinitrobenzene with basic hydrogen peroxide

1987 ◽  
Vol 65 (2) ◽  
pp. 251-255 ◽  
Author(s):  
Raymond A. Heller ◽  
Richard Weiler
Keyword(s):  
Hydrogen Peroxide ◽  
Strong Evidence ◽  
Nmr Spectra ◽  
Visible Region ◽  
Kinetic Studies ◽  
Aqueous Dioxane ◽  
First Time ◽  
Kinetics Of ◽  
Basic Hydrogen Peroxide ◽  
C Nmr

Kinetic studies of the reaction of p-dinitrobenzene with H2O2 and NaOH in 10%, 30%, and 50% aqueous dioxane have been carried out at 30.0 °C. The reaction involves the formation of a reasonably stable intermediate which absorbs strongly in the visible region, with the rate of formation being about 18 times faster than the rate of conversion to final product which is p-nitrophenol. Proton and 13C nmr spectra of the kinetic solution provide strong evidence that the intermediate is p-nitrophenyl hydroperoxide, apparently the first time that a true aryl peroxide species has been identified.

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