Spectroscopic Characterization of Some Tetradentate Schiff Bases and Their Complexes with Nickel, Copper and Zinc

Abd-Elzaher, Mokhles M.

doi:10.1002/jccs.200100027

Cited by 119 publications

(58 citation statements)

References 26 publications

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“…δOH disappears and new bands will appear in the spectra of complexes molecules around the range of 469 to 688 cm -1 and 528 to 660 cm -1 are assign to (M-O) and (M-N) bonding [10]. For the L 5 the infrared spectra of these complexes display a broadband at 3292-3466 cm -1 because of the presence of water molecules [11]. The absorption bands at 1610 , 1529 cm -1 are dedicate to the existence of (C=N) group of azomethine.…”

Section: Infrared Spectramentioning

confidence: 98%

Synthesis, Characterization and Antibacterial Activityof Schiff Bases Derived from 4-Dimethylaminobenzaldehyde with Some Amino Acids and 4-Aminoantipyrine toward Cu (II), Ni (II), Co (II), Cd (II) and Mn (II) Ions

Ferjani¹,

Ahmad²,

Harun³

et al. 2017

IOSR JAC

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A new chain of Schiff base complexes made up of Cu (II), Co (II), Cd (II),Ni (II), and Mn (II) ions derivatives were obtained by the condensation of 4-dimethyl-aminobenzaldehyde, and 4-aminoantipyrin and some amino acids. The structures of all synthesized complexes were established on the basis of their elemental analysis (UV, FTIR, and 1 HNMR). The study of X-ray crystallographic shows that the compound (Z)-4-((4-(dimethylamino)benzylidene)amino)-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one (L 5 ) crystallized in monoclinic system with space group of C2/c and the unit cell dimensions are a= 17.7916, b= 6.8610, c= 29.7199, α =90.000 β =101.326 γ = 90.000., Z = 8 and V = 3557.20 Å 3 .The antibacterial activity of the complexes are tested against Bacillus subtilis, Bacillus cereus and Pseudomonas aeruginosa.

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Section: Infrared Spectramentioning

confidence: 98%

Synthesis, Characterization and Antibacterial Activityof Schiff Bases Derived from 4-Dimethylaminobenzaldehyde with Some Amino Acids and 4-Aminoantipyrine toward Cu (II), Ni (II), Co (II), Cd (II) and Mn (II) Ions

Ferjani¹,

Ahmad²,

Harun³

et al. 2017

IOSR JAC

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“…The disappearance of this band in the corresponding metal complexes indicates involvement of phenolic oxygen in coordination to the metal after deprotonation. This is further confirmed by the shift in the position of ν(C-O)) band to lower wave numbers by 20-30 cm -1 [14]. The participation of azomethine nitrogen is proved by the shift of strong and sharp bands at 1613 and 1602 cm -1 for H2L 1 and H2L 2 , respectively to a lower frequencies after complexation [15].…”

Section: Resultsmentioning

confidence: 54%

Synthesis, Characterization, X-Ray Diffraction Studies and Biological Properties of Ni(II) and Pd(II) Complexes of Tetradentate Schiff Bases

Shaikh¹

2018

Asian J. Chem.

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INTRODUCTIONSchiff bases have an important position in the development of coordination chemistry due to their synthetic accessibility and physico-chemical properties. Transition metal complexes of azomethines have photochemical, catalytic, medicinal and electrochemical applications [1][2][3]. Tetradentate ONNO type Schiff bases have been reported for designing macrocyclic biomolecules that help in understanding biological processes [4,5]. Palladium(II) complexes have been investigated for its catalytic activity [6], photoluminescence properties as well as antitumor, anti-HIV and antimicrobial activities [7].The reactions of tetradentate Schiff bases acquired from salicylaldehyde and diamines are a subject of interest of many authors [8,9] due to the ease of preparation and variable geometries. In the present paper, an attempt has been made to synthesize Ni(II) and Pd(II) complexes of tetradentate Schiff bases and further investigate the structure these complexes by spectral characterization and powder X-ray diffraction studies. EXPERIMENTALAll the chemicals used were of analytical reagent grade purchased from SDFCL Mumbai, India and used as such without further purification. Magnetic susceptibility and electronic spectral data confirm the diamagnetic nature and square planar geometry for the complexes. The powder X-ray diffraction data suggested monoclinic crystal system for these complexes. The ligands and their metal complexes have been screened for antimicrobial activities.

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“…The bathochromic shift in Table 4, which may be due to a LMCT transition. The measured l eff value of Cu-L is 1.74 BM; this value suggests the square-planar geometry [30]. On the other hand, the magnetic moment of Ni-L complex is (2.93) B.M; this value is within the range (2.9-3.3 BM), found for paramagnetic complex of Ni(II) with octahedral geometry Complexes of Schiff base of benzopyran-4-one derivative [31,32].…”

Section: Electronic Absorption Spectra and Magnetic Susceptibility Mementioning

confidence: 87%

Complexes of Schiff base of benzopyran-4-one derivative

Abdel-Kader

Amin

El-Ansary

2015

J Therm Anal Calorim

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New metal complexes of Schiff base (L) prepared from condensation reaction of 2-aminopyridine and 6-formyl-7-hydroxy-5-methoxy-2-methylbenzopyran-4-one with metal ions; Mn(II), Co(II), Ni(II) and Cu(II) are synthesized. Different analysis tools such as elemental analyses, FTIR, thermal analyses, conductivity, mass spectrometry, electronic spectra and magnetic susceptibility measurements are all used to elucidate the structures of the newly prepared metal complexes. The IR spectral data suggested that the ligand behaves as a monobasic bidentate ligand toward the central metal ion with ON donor atoms. The thermal decomposition kinetics of all complexes was estimated by Coats-Redfern. Ni-L and Co-L complexes were selected to study their thermal decomposition under non-isothermal conditions using Flynn-Wall-Ozawa and Starink methods at different three heating rates (5, 10 and 15°C min -1 ). The values of the activation energy (E) obtained by the all methods are in good agreement. All complexes are thermally stable as reflected from the high value of their activation energies. Ni-L complex has the highest thermal stability, and Mn-L complex has the lowest one indicating that Mn-L complex has fast rate of successive decomposition. The Schiff base L, Cu-L and Mn-L compounds were screened for in vitro cytotoxicity against normal standard fibroblast cells (3T3) using MTT assay. Among these compounds, Mn-L complex enhanced growth inhibition and cell death in a concentrationdependent manner for the standard fibroblast cells (3T3). Mn-L complex was then subjected against four human cancer cell lines; human hepatocellular carcinoma (Huh-7), human Hepatoblastoma (Hep G2) and human cervical cancer cells (HeLa & HeLa-Fas) for anticancer activity. Results indicate that Mn-L complex may be useful leads for anticancer drug development in the future.

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Spectroscopic Characterization of Some Tetradentate Schiff Bases and Their Complexes with Nickel, Copper and Zinc

Cited by 119 publications

References 26 publications

Synthesis, Characterization and Antibacterial Activityof Schiff Bases Derived from 4-Dimethylaminobenzaldehyde with Some Amino Acids and 4-Aminoantipyrine toward Cu (II), Ni (II), Co (II), Cd (II) and Mn (II) Ions

Synthesis, Characterization and Antibacterial Activityof Schiff Bases Derived from 4-Dimethylaminobenzaldehyde with Some Amino Acids and 4-Aminoantipyrine toward Cu (II), Ni (II), Co (II), Cd (II) and Mn (II) Ions

Synthesis, Characterization, X-Ray Diffraction Studies and Biological Properties of Ni(II) and Pd(II) Complexes of Tetradentate Schiff Bases

Complexes of Schiff base of benzopyran-4-one derivative

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