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Singh, Nand K.; Singh, Shikha

doi:10.1023/a:1011092801141

Cited by 53 publications

(16 citation statements)

References 14 publications

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“…The first two bands are within the ligand and the third and fourth bands are due to charge transfer transition while the last band is considered to arise from the 6 A 1 ! 4 T 1 transition; these bands suggest, distorted octahedral geometry around the iron(III) [55,57]. Ruthenium(III) complex (15), in DMF solution shows bands at 255, 315, 450 and 590 nm respectively.…”

Section: Electronic Spectramentioning

confidence: 99%

Synthesis, spectroscopic investigation and biological activity of metal complexes with ONO trifunctionalalized hydrazone ligand

El‐Tabl

El‐Saied

Al‐Hakimi

2007

Transition Met Chem

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Mn II , Fe III , Co II , Ni II , Cu II , Zn II , La III , Ru III , Hf IV , Zr IV and U VI complexes of 4-methylphenylamino acetoacetylacetone hydrazone have been synthesized and characterized by elementals analyses, i.r., u.v.-vis. spectra, magnetic moments, conductances, thermal analyses (d.t.a and t.g.a) and e.s.r measurements. The i.r. data show that, the ligand behaves as a neutral bidentate type (10), (13) and neutral tridentate type (4), (11), (12) and (21) monobasic bidentate type (7) or monobasic tridentate type (and (22) or dibasic tridentate type (5), (9) and (17) towards the metal ion. Molar conductances in DMF solution indicate that, the complexes are non-electrolytes. The e.s.r spectra of solid complexes (8) and (10) show axial type spectra with g k > g ? > 2:0023, a d (x 2 -y 2 ) ground state with significant covalent bond character. However, complex (12), shows an isotropic type, indicating a octahedral manganese(II) complex. Antibacterial and antifungal tests of the ligand and some of its metal complexes are also carried out and it has been observed that, the complexes are more potent bactericides and fungicides than the ligand.

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Section: Electronic Spectramentioning

confidence: 99%

Synthesis, spectroscopic investigation and biological activity of metal complexes with ONO trifunctionalalized hydrazone ligand

El‐Tabl

El‐Saied

Al‐Hakimi

2007

Transition Met Chem

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“…The magnetic moment value of [Ni((H 3 APET)Cl 2 ] Á ½H 2 O of 3.28 BM is expected for octahedral structure with 3 A 2g ground term [25]. Its electronic spectrum showed broad bands centered at 23695 ( 3 ) and 15625 cm À1 ( 2 ) assigned to 3 A 2g (F) !…”

Section: Electronic Spectra and Magnetic Momentsmentioning

confidence: 99%

Synthesis and spectral characterization of 1-(aminoformyl- N -phenylform)-4-ethylthiosemicarbazide and its metal complexes

El‐Gammal

El‐Asmy

2008

Journal of Coordination Chemistry

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The chelating characteristics of 1-(aminoformyl-N-phenylform)-4-ethylthiosemicarbazide (H 3 APET) towards Cr 3þ , Fe 3þ , Mn 2þ , Co 2þ , Ni 2þ , Cu 2þ , Cd 2þ , Zn 2þ and UO 2þ 2 ions have been investigated. The structures of the isolated complexes were assigned based on elemental and thermal analyses, spectra [IR, UV-visible, 1 H NMR, ESR (for Cu(II)) and mass] as well as magnetic measurements. The IR data reveal different coordination modes for H 3 APET. Based on magnetic and spectroscopic studies Zn 2þ , Fe 3þ , Cd 2þ , Ni 2þ , UO 2þ 2 and Mn 2þ complexes are octahedral, Co 2þ and Cr 3þ complexes are tetrahedral, while the Cu 2þ complex is square-planar. Thermal stability and degradation kinetics of the complexes were studied by TGA and DTA and the kinetic parameters were evaluated.

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“…35 The electronic spectrum of this complex in nujol mull shows several absorptions at 370, 451, 482 and 510 nm, the respectively, which are typical to octahedral Fe(III) complex. 36,37 However, in HCl, the complex exhibits two absorptions at λ max =471 nm (ε=150.9 M , configuration. It gives a signal at g=4.4 which is similar to Fe 3+ complexes.…”

Section: Iron(iii) Complexmentioning

confidence: 99%

Synthesis and Spectroscopic Characterization of Manganese(II), Iron(III) and Cobalt(III) Complexes of Macrocyclic Ligand. Potential of Cobalt(III) Complex in Biological Activity

El‐Tabl¹,

Shakdofa²,

El‐Seidy³

2011

Journal of the Korean Chemical Society

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ABSTRACT. A new series of manganese(II), iron(III) and cobalt(III) complexes of 14-membered macrocyclic ligand, (3,6, 10,13,16,19-hexaazabicyclo[6.6.6]icosane-1,8-diamine) have been prepared and characterized by elemental analyses, IR, UV-VIS, 1 H-and 13 C-NMR spectra, magnetic susceptibilities, conductivities, and ESR measurements. Molar conductance measurements in DMF solution indicate that the complexes are electrolytes. The ESR spectrum for cobalt(III) complex in CD3OD+10%D2O after exposure to 60 Co-γ-rays at 77 K using a 0.2217 M rad h -1 vicrad source showed g⊥>g||>ge, indicating that, the unpaired electron site is mainly present in the dz2 orbital with covalent bond character. In this case, the ligand hyperfine tensors are nearly collinear with γ-tensors, so there is no major tendency to bend. Therefore, little extra delocalization via the ring lobe of the dz 2 orbital occurs. However, the ESR spectrum in solid state after exposure to 60 Co-γ-rays at 77 K showed g||>g⊥>ge, indicating that, the unpaired electron site is mainly present in the dx2-y2 ground state as the resulting spectrum contains a large number of randomly oriented molecules provided that, the principle directions of g and A tensors. Manganese (II) complex 2, [H12LMn]Cl4.2H2O, showed six isotropic lines characteristic to an unpaired electron interacting with a nucleus of spin 5/2, however, iron(III) complex 3, [H12LFe]Cl5.H2O, showed spectrum of a high spin 57 Fe (I=1/2), d 5 configuration. The geometry of these complexes was supported by elemental analyses, IR, electronic and ESR spectral studies. Complex 1 showed exploitation in reducing the amount of electron adducts formed in DNA during irradiation with low radiation products.

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Untitled

Cited by 53 publications

References 14 publications

Synthesis, spectroscopic investigation and biological activity of metal complexes with ONO trifunctionalalized hydrazone ligand

Synthesis, spectroscopic investigation and biological activity of metal complexes with ONO trifunctionalalized hydrazone ligand

Synthesis and spectral characterization of 1-(aminoformyl- N -phenylform)-4-ethylthiosemicarbazide and its metal complexes

Synthesis and Spectroscopic Characterization of Manganese(II), Iron(III) and Cobalt(III) Complexes of Macrocyclic Ligand. Potential of Cobalt(III) Complex in Biological Activity

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