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Maravalli, P. B.; Gudasi, Kalagouda B.; Goudar, T. R.

doi:10.1023/a:1007032902220

Cited by 23 publications

(17 citation statements)

References 8 publications

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“…Also, the values of the activation energy (Δ G ) increase significantly for the subsequent decomposition stages of a given complex. This is due to the increase in the values of T Δ S significantly from one step to another, which overrides the values of Δ H …”

Section: Resultsmentioning

confidence: 99%

Synthesis, Spectral Characterization, Antitumor, Antioxidant, and Antimicrobial Studies of New Potential ONS Schiff Base Complexes

Alturiqi

Alaghaz

Ammar

2017

J Chinese Chemical Soc

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Novel Co(II), Ni(II), Cu(II), and Zn(II) complexes derived from 2‐aminopyridine‐3‐thiol and 4‐oxo‐4H‐chromene‐3‐carbaldehyde were synthesized and characterized by spectroscopic (IR, 1H NMR, UV–vis, ESR, and MS) and other analytical methods. Molar conductance data and magnetic susceptibility measurements provide evidence for the monomeric and monobasic nature of the complexes. The molar conductance measurement of the complexes in DMSO corresponds to their non‐electrolytic nature. All the complexes are of high‐spin type. On the basis of the different spectral studies, the six‐coordinated geometry may be assigned for all the complexes. IR spectral studies indicate the binding sites of the ligand with the metal ion. The Schiff base acts as tridentate ligand coordinated through deprotonated thiolic (SH) sulfur, azomethine (─CH═N─) nitrogen, and carbonyl (−C═O) oxygen atoms. The ligand field parameters were calculated for Co(II) and Ni(II) complexes and their values were found to be in the range reported for an octahedral structure. The data show that the complexes have an ML2‐type composition. The activation thermodynamic parameters are calculated using the Coast–Redfern, Horowitz–Metzger (HM), Piloyan–Novikova (PN), and Broido equations. The X‐ray diffraction data suggest a triclinic system for all compounds. Different surface morphologies were identified from SEM micrographs. Human tumor cell lines A427 (lung cancer cell line), LCLC‐103H (large cell lung cancer), SISO (uterine adenocarcinoma), and 5637(human bladder carcinoma) grown in RPMI‐1640 medium were elevated. The biological screening data show that the complexes show growth inhibitory activity against various microorganisms. The octahedral geometry of the complexes is confirmed using density functional theory (DFT) from DMOL3 calculations, electronic and magnetic moment measurements, ESR, and ligand field parameters.

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Section: Resultsmentioning

confidence: 99%

Synthesis, Spectral Characterization, Antitumor, Antioxidant, and Antimicrobial Studies of New Potential ONS Schiff Base Complexes

Alturiqi

Alaghaz

Ammar

2017

J Chinese Chemical Soc

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“…Also, the values of ∆ G increase appreciably for the subsequent decomposition stages of a given complex. This is due to the increasing values of T ∆ S from one step to another which dominate the values of ∆ H . The negative ∆ S values for the decomposition steps indicate that the activated complex is more ordered in its activated state .…”

Section: Resultsmentioning

confidence: 98%

Effect of the formation of silver nano‐binuclear complex on the refinement of cytotoxic and antibacterial potency of coumarin Schiff base: Spectroscopy, thermal, X‐ray diffraction analyses and density functional theory calculations

El-Ansary

Moustafa

Abdel-Kader

et al. 2019

Applied Organom Chemis

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A new Schiff base (SCH) was prepared using 8‐acetyl‐7‐hydroxy‐4‐methylcoumarin and sulfaclozine. Its silver complex was also synthesized. These compounds were subjected to elemental and spectral analyses. The silver complex was also subjected to thermogravimetric analysis, molar conductance measurements, scanning electron microscopy, energy‐dispersive X‐ray analysis and X‐ray diffraction measurements. The formula of the complex was determined as [(Ag2SCH(NO3)2]. The molar conductance indicates its non‐electrolyte character. The electronic structure and nonlinear optical parameters of SCH and its complex were investigated theoretically at the B3LYP/GENECP level. The geometry of the studied complex is non‐planar as indicated from the dihedral angles between central Ag metal ion and coordinated centres of SCH. Density functional theory calculations were also carried out to calculate the global properties of hardness, global softness and electronegativity. The calculated energy gap between HOMO and LUMO energies shows that charge transfer occurs within the studied complex. The total static dipole moment, the mean polarizability, the anisotropy of the polarizability and the mean first‐order hyperpolarizability were calculated and compared with those of urea as a reference material. The results of the mean first‐order hyperpolarizability showed that SCH and its silver complex are excellent candidates as nonlinear optical materials. The compounds were screened for their antimicrobial effect against various species of bacteria and fungi. Their anticancer activities were evaluated in vitro against the human cancer cell line MCF‐7 (human breast adenocarcinoma).

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“…5) The entropy values for all degradation steps of all degradation steps of all complexes were found to be negative, which indicates a more ordered activated state that may be possible through the chemisorption of some decomposition products [51][52][53].…”

Section: Discussionmentioning

confidence: 99%

Synthesis and thermal studies of mixed ligand complexes of Cu(II), Co(II), Ni(II) and Cd(II) with mercaptotriazoles and dehydroacetic acid

Fouad¹,

Bayoumi²,

El-Gahami³

et al. 2010

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Untitled

Cited by 23 publications

References 8 publications

Synthesis, Spectral Characterization, Antitumor, Antioxidant, and Antimicrobial Studies of New Potential ONS Schiff Base Complexes

Synthesis, Spectral Characterization, Antitumor, Antioxidant, and Antimicrobial Studies of New Potential ONS Schiff Base Complexes

Effect of the formation of silver nano‐binuclear complex on the refinement of cytotoxic and antibacterial potency of coumarin Schiff base: Spectroscopy, thermal, X‐ray diffraction analyses and density functional theory calculations

Synthesis and thermal studies of mixed ligand complexes of Cu(II), Co(II), Ni(II) and Cd(II) with mercaptotriazoles and dehydroacetic acid

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