Synthesis, spectroscopic characterization, solid state d.c. electrical conductivity and biological studies of some lanthanide(III) chloride complexes with a heterocyclic Schiff base ligand

Mohanan, K.; Subhadrambika, N.; Joseyphus, R. Selwin; Swathy, S.; Nisha, V.P.

doi:10.1016/j.jscs.2012.07.007

Cited by 27 publications

(13 citation statements)

References 28 publications

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“…Some Schiff base complexes exhibit interesting physical and chemical properties [3][4][5][6], and potentially useful biological activities [7][8][9], used in analytical fields [10] and reported as effective corrosion inhibitors for some metals in acidic media [11] and important precursors for semiconducting materials [12,13]. The effect of variation of the metal ion and the substituted function group of Schiff base complexes on dc and ac conductivity have been studied by many authors [12][13][14][15]. Mohanan et al [12] studied the dc electrical conductivity of some lanthanide(III) complexes with a heterocyclic Schiff base ligand.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of variation of the metal ion and the substituted function group of Schiff base complexes on dc and ac conductivity have been studied by many authors [12][13][14][15]. Mohanan et al [12] studied the dc electrical conductivity of some lanthanide(III) complexes with a heterocyclic Schiff base ligand. They reported that the values of r ac for La(III) complex were lower than that of Gd(III) complex.…”

Section: Introductionmentioning

confidence: 99%

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Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

et al. 2015

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The synthesized Schiff base ligand 8-hydroxyquinoline-7-formylidene-4-amino-1-phenyl-2,3-dimethylpyrazolin-5-one (SQL) and its Cu(II), VO(IV) and UO 2 (II) complexes are characterized by various physicochemical techniques. The thermal properties, dielectric properties, alternating current conductivity (r ac ) and conduction mechanism of SQL and its complexes (1-6) are investigated in the frequency range of 0.1-100 kHz and temperature range 298-583 K. The temperature and frequency dependence of the real and the imaginary part of the dielectric constant are studied. The values of the thermal activation energy of conduction mechanism for SQL and its complexes under investigation are calculated at different test frequencies, and found to be in the range 0.0023-0.0798 eV for DE 1 and 0.0897-1.296 eV for DE 2 . The ac conductivity, r ac , is related to the frequency as r ac a x S where the behavior of the exponent S with temperature determines the operating conduction mechanism. The correlated barrier hopping model is found to be the dominant conduction mechanism for SQL and its complexes (1) and (3-5), and the values of the maximum barrier height (W m ) are calculated for SQL and its complexes (1) and (3-5). The quantum-mechanical tunneling is the dominant conduction mechanism for complexes (2) and (6).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

et al. 2015

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“…Broad bands appeared in the spectra of all complexes at 3408–3442 cm −1 due to ν(OH) . A weak band at 1700 cm −1 for the ligand corresponding to ν(C―O) of the carboxylic carbonyl group on the histidine moiety was shifted to a higher frequency by about 10–20 cm −1 , or disappeared, upon chelation, suggesting coordination of the carboxylate group with metal ions . The sharp band appearing at 1654 cm −1 might be assigned to ν(C―N) vibration of the ligand which shifted to lower frequency of 1593–1630 cm −1 for the complexes due to coordination with metal ions …”

Section: Resultsmentioning

confidence: 98%

Synthesis, characterization, spectroscopic and theoretical studies of transition metal complexes of new nano Schiff base derived from l‐histidine and 2‐acetylferrocene and evaluation of biological and anticancer activities

Mahmoud

Omar

Sayed

2018

Applied Organom Chemis

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A new Schiff base derived from the condensation of 2‐acetylferrocene with l‐histidine was prepared and characterized using elemental analyses and spectroscopic methods. Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) complexes of the Schiff base were prepared and characterized using various physicochemical methods such as elemental analysis, Fourier transform infrared and UV–visible spectroscopies, molar conductance, thermal analysis and scanning electron microscopy (SEM). Both ligand and complexes were investigated for their biological and anticancer activities. The elemental analyses showed that complexes were formed in a metal‐to‐ligand ratio of 1:1 stoichiometry. The spectral analyses proved that the ligand was tridentate and all complexes had an octahedral geometry, except the Zn(II) complex that was tetrahedral. SEM showed that the ligand and its Cd(II) complex were of nanometric structure. The molecular and electronic structure of the free ligand was optimized theoretically and the quantum chemical parameters were calculated. The molecular structure can be used to investigate the coordination sites and the total charge density around each atom. According to anticancer studies, Cd(II) complex was recommended to be used as anti‐breast cancer drug as it had very low IC50 (3.5 μg ml−1). Molecular docking was used to predict the binding between the free ligand and its Cd(II) complex and crystal structure of Staphylococcus aureus (PDB ID: 3Q8u), receptors of breast cancer mutant oxidoreductase (PDB ID: 3Hb5) and crystal structure of Escherichia coli (PDB ID: 3 T88) and to identify the binding mode and the crucial functional groups interacting with the three proteins.

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“…The free ligand exhibits IR peaks at 3142 cm -1 (O-H), 1635 cm -1 (C=N) and 1307 cm -1 phenolic (C-O) [19,20]. In complexes the peak due to (O-H) of the ligand disappeared indicating the co-ordination of phenolic oxygen to the metal ion via deprotonation.…”

Section: Infrared Spectramentioning

confidence: 99%

Synthesis and Spectroscopic Investigation of Novel Nickel(II) Complexes from Pentadentate Schiff Base Ligand

Geetha¹

2017

SOJMSE

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Synthesis, spectroscopic characterization, solid state d.c. electrical conductivity and biological studies of some lanthanide(III) chloride complexes with a heterocyclic Schiff base ligand

Cited by 27 publications

References 28 publications

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

Synthesis, characterization, spectroscopic and theoretical studies of transition metal complexes of new nano Schiff base derived from l‐histidine and 2‐acetylferrocene and evaluation of biological and anticancer activities

Synthesis and Spectroscopic Investigation of Novel Nickel(II) Complexes from Pentadentate Schiff Base Ligand

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