SYNTHESIS, EPR, AND ELECTRONIC SPECTRAL STUDIES ON Cr(III) AND Mn(II) COMPLEXES OF SOME OXIMES

Chandra, Sulekh; Pipil, Poonam; Sharma, Shallu

doi:10.1081/sim-100104850

Cited by 10 publications

(3 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2). New bands between 515-560 and 410-460 cm À1 assigned to (M-O) and (M-N) [14] respectively, support the view that bonding of metal ions to the ligand is achieved through the phenolic oxygen atom and nitrogen atoms of the heterocyclic pyrazole ring. The IR spectrum of the UO 2 (VI) complex shows a strong absorption band at 910 cm À1 , which is assigned to the antisymmetric 3 (O¼U¼O) vibration [15].…”

Section: Ir Spectrasupporting

confidence: 50%

Synthesis, Spectroscopic and Magnetic Studies on Metal Complexes of 5-Methyl-3-(2-Hydroxyphenyl)Pyrazole

Khalil

2003

Journal of Coordination Chemistry

View full text Add to dashboard Cite

A tridentate ONN donor ligand, 5-methyl-3-(2-hydroxyphenyl)pyrazole; H 2 L, was synthesized by reaction of 2-(3-ketobutanoyl)phenol with hydrazine hydrate. The ligand was characterized by IR, 1 H NMR and mass spectra. 1 H NMR spectra indicated the presence of the phenolic OH group and the imine NH group of the heterocyclic moiety. Different types of mononuclear metal complexes of the following formulae [(HL) 2 M] Á xH 2 O (M¼VO, Co, Ni, Cu, Zn and Cd), [(HL) 2 M(H 2 O) 2 ] (M¼Mn and UO 2 ) and [(HL)LFe(H 2 O) 2 ] were obtained. The Fe(III) complex, [(HL)LFe(H 2 O) 2 ] undergoes solvatochromism.Elemental analyses, IR, electronic and ESR spectra as well as thermal, conductivity and magnetic susceptibility measurements were used to elucidate the structures of the newly prepared metal complexes. A squarepyramidal geometry is suggested for the VO(IV) complex, square-planar for the Cu(II), Co(II) and Ni(II) complexes, octahedral for the Fe(III) and Mn(II) complexes and tetrahedral for the Zn(II) and Cd(II) complexes, while the UO 2 (VI) complex is eight-coordinate. Transmetallation of the UO 2 (VI) ion in its mononuclear complex by Fe(III), Ni(II) or Cu(II) ions occurred and mononuclear Fe(III), Ni(II) and Cu(II) complexes were obtained. IR spectra of the products did not have the characteristic UO 2 absorption band and the electronic spectra showed absorption bands similar to those obtained for the corresponding mononuclear complexes. Also, transmetallation of the Ni(II) ion in its mononuclear complex by Fe(III) has occurred. The antifungal activity of the ligand and the mononuclear complexes were investigated.

show abstract

Section: Ir Spectrasupporting

confidence: 50%

Synthesis, Spectroscopic and Magnetic Studies on Metal Complexes of 5-Methyl-3-(2-Hydroxyphenyl)Pyrazole

Khalil

2003

Journal of Coordination Chemistry

View full text Add to dashboard Cite

show abstract

“…The entropy increasing after the dissociation, but some complexes that studies have been negative values. Suggesting these complexes molecules takes different geometries isomers [7,13]. After dissociation this possibilities are decrease for ions species in solution.…”

Section: Fig(9) the Enthalpy Of M(hanh) 2 In Dmfmentioning

confidence: 99%

“…Transition metal complexes of 2hydroxyaromatic oximes have attracted much attention as they give cis and trans geometrical isomers. Nickel complexes are known to assume trans structure while cobalt complexes have cis structure [12][13]. The complexation of transition metals as an electron acceptor with various electron donor bases including (Schiff bases or Oximes) as an acceptor to form charge-transfer complexes have been extensively studied [14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Spectral and Dissociation Thermodynamics Studies of Cobalt (II), Nickel (II) and Copper (II) Complexes with 2-Hydroxyacetophenone Derivatives

Naser¹

2011

JNUS

View full text Add to dashboard Cite

The ketone 2 -hydroxyacetophenone was treated with ammonia gas and hydroxylamine hydrochloride for the synthesis of its Schiff base and oxime respectively. The two ligands were used to synthesize Co(II), Ni(II) and Cu(II) complexes. The ligands and complexes have been characterized by IR and UV spectroscopy. Elemental analyses have been performed using C. H. N. for ligands and atomic absorption technique for complexes. The limiting molar conductivity of [M(HANH) 2 ] and [M(HAO) 2 ] complexes in DMF a nd DMSO at different temperature was measured. The dissociation constant, thermodynamic parameters of dissociation (ΔG, ΔH and ΔS) and the activation energy of the transport process (Ea) were calculated and discussed. The results show that the dissociation constant values in DMF are larger than that in DMSO. The dissociation process is endothermic for all complexes.

show abstract

Site-substitution in GdCrO3: Effects of Mn valence states on structural, magnetic and electric properties

Zuo,

Su,

Gong

et al. 2024

Journal of Alloys and Compounds

View full text Add to dashboard Cite

SYNTHESIS, EPR, AND ELECTRONIC SPECTRAL STUDIES ON Cr(III) AND Mn(II) COMPLEXES OF SOME OXIMES

Cited by 10 publications

References 41 publications

Synthesis, Spectroscopic and Magnetic Studies on Metal Complexes of 5-Methyl-3-(2-Hydroxyphenyl)Pyrazole

Synthesis, Spectroscopic and Magnetic Studies on Metal Complexes of 5-Methyl-3-(2-Hydroxyphenyl)Pyrazole

Synthesis, Spectral and Dissociation Thermodynamics Studies of Cobalt (II), Nickel (II) and Copper (II) Complexes with 2-Hydroxyacetophenone Derivatives

Site-substitution in GdCrO3: Effects of Mn valence states on structural, magnetic and electric properties

Contact Info

Product

Resources

About