An attempt towards coordination supramolecularity from Mn(II), Ni(II) and Cd(II) with a new hexadentate [N4O2] symmetrical Schiff base ligand: Syntheses, crystal structures, electrical conductivity and optical properties

Sarkar, Sushanta; Biswas, Susobhan; Liao, Meng‐Sheng; Kar, Tapas; Aydoğdu, Y.; Dağdelen, Fethi; Mostafa, Golam; Chattopadhyay, Asoke P.; Yap, Glenn P. A.; Xie, Rui-Hua; Khan, Abu T.; Dey, Kamalendu

doi:10.1016/j.poly.2008.07.034

Cited by 27 publications

(15 citation statements)

References 53 publications

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“…IR spectra of the complexes (1)(2)(3)(4)(5)(6) show that the ligand behaves as a bidentate ligand depending on the metal salt used. IR spectrum of the Schiff base ligand (SQL) shows a broad band assigned to phenolic OH group; t(OH) [5,21,22] and a strong band at 1305 cm -1 assigned to the stretching frequency of the phenolic C-O bond; t(C-O) [5,21,22], affected by complexation with different degrees.…”

Section: Ir Spectra and Mode Of Coordinationmentioning

confidence: 99%

“…4). The temperature dependences of e r and e i for complexes (1)(2)(3)(4)(5)(6) at test frequency 10 kHz are shown in Figs. 7 and 8, respectively.…”

Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 99%

“…The values of DE 1 and DE 2 for SQL and its complexes (1-6) are calculated and listed in Table 5. The variation of DE 1 and DE 2 can be attributed to the different behaviors of metal anions in SQL complexes (1)(2)(3)(4)(5)(6) and the different behaviors with temperature as shown in TGA curves [42]. As Table 1 shown in Table 5, SQL has the lowest values of the activation energies DE 1 = 0.0023-0.0079 eV and DE 2 = 0.089-0.205 eV, depending on the test frequencies.…”

Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 99%

“…This behavior can be explained in terms of quantum mechanics tunneling (QMT). For CBH model, the maximum barrier height, W m , as a function of temperature for SQL and its complexes (1,(3)(4)(5), is plotted in Fig. 12.…”

Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 99%

“…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].…”

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: Ir Spectra and Mode Of Coordinationmentioning

confidence: 99%

“…4). The temperature dependences of e r and e i for complexes (1)(2)(3)(4)(5)(6) at test frequency 10 kHz are shown in Figs. 7 and 8, respectively.…”

Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 99%

Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 99%

Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 99%

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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Synthesis, structural characterization, antimicrobial, antioxidant and DNA binding studies of some novel homo‐binuclear Schiff base metal (II) complexes

Aziz

Shawky

Khalil

2018

Applied Organom Chemis

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A novel bi‐nucleating Schiff base ligand, 6,6′‐(((1E,1′E)‐thiophene‐2,5‐diylbis (methaneylylidene))bis (azaneylylidene))bis (3,4‐dimethylaniline), and five binuclear M (II) complexes were synthesized. The bi‐nucleating Schiff base ligand and its metal complexes were characterized using various physicochemical techniques, e.g. elemental analyses, spectroscopic methods, conductivity and magnetic moment measurements. The low molar conductance of the complexes in dimethylsulfoxide shows their non‐electrolytic nature. The antibacterial activities were screened against pathogenic bacteria (Staphylococcus aureus, Escherichia coli, Pseudomonas putida and Bacillus subtilis). The antifungal activity was screened against Aspergillus niger, Aspergillus flavus and Rhizoctonia bataicola. The antimicrobial activity data showed that the metal complexes are more potent than the parent Schiff base ligand against microorganisms. The antioxidant activities of the synthesized compounds were investigated through scavenging activity against 2,2‐diphenyl‐2‐picrylhydrazyl, superoxide anion, hydroxyl and 2,2′‐azinobis (3‐ethylbenzothiazoline‐6‐sulfonic acid) radicals. The complexes have superior radical scavenging activity than the free ligand and the scavenging effects of the Cu (II) complex are stronger than those of the other complexes. DNA binding studies were performed using electronic spectroscopy, fluorometric competition studies and viscosity measurements. The data indicated that there is a marked enhancement in biocidal activity of the ligand under similar experimental conditions because of coordination with metal ions.

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Some novel hexa‐coordinated cadmium Schiff base complexes: X‐ray structure, Hirshfeld surface analysis, antimicrobial and thermal analysis

Mousavi

Montazerozohori

Naghiha

et al. 2020

Applied Organom Chemis

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A series of cadmium (II) complexes with the general formula of CdLX2, where X = Cl−, Br−, I−, SCN− and N3− and L is a tetradentate N4‐donor Schiff base ligand; were synthesized by a sonochemical process as a simple, cost effective and environmentally friendly method. The organic ligand was obtained by condensation reaction of triethylenetetraamine (trien) and cinnamaldehyde. The characterization of coordination compounds was carried out by FT‐IR, 1HNMR, 13CNMR, UV–visible spectroscopies and then conductivity measurements. The crystal structure of the cadmium azide complex was determined by single crystal X‐ray diffraction. This complex crystallizes in the monoclinic space group of C2/c. The cadmium ion is hexa‐coordinated by four nitrogen atoms from the tetradendate Schiff base ligand and two terminal azide nitrogen atoms. The crystal packing and Hirshfeld surface analysis of the CdL(N3)2 complex indicates the essential role of intermolecular interactions related to azido groups in the formation of supramolecular structure. The thermal behavior of complexes was studied by TG/DTG analysis. Moreover, an antibacterial bioassay of the cadmium complexes has been performed in vitro against two gram‐positive (Staphylococcus aureus and Bacillus subtilis) and two gram‐negative (Escherichia coli and Pseudomonas aeruginosa) bacterial strains. Furthermore antifungal activities of the compounds against two fungal strains of Aspergilus niger and Candida albicans were also investigated.

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An attempt towards coordination supramolecularity from Mn(II), Ni(II) and Cd(II) with a new hexadentate [N4O2] symmetrical Schiff base ligand: Syntheses, crystal structures, electrical conductivity and optical properties

Cited by 27 publications

References 53 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, structural characterization, antimicrobial, antioxidant and DNA binding studies of some novel homo‐binuclear Schiff base metal (II) complexes

Some novel hexa‐coordinated cadmium Schiff base complexes: X‐ray structure, Hirshfeld surface analysis, antimicrobial and thermal analysis

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