Synthesis, characterization and magnetic study of two new octahedral iron(III) complexes with pendant zwitterionic Schiff bases

Jana, Subrata; Bhattacharyya, Arpita; Ghosh, Biswa Nath; Herrero, Santiago Montero; Jiménez‐Aparicio, Reyes; Chattopadhyay, Shouvik

doi:10.1016/j.ica.2016.09.005

Cited by 15 publications

(2 citation statements)

References 68 publications

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“…Simultaneously fitting the susceptibility and magnetization data required only the inclusion of axial ZFS, affording g = 2.07(1) and D = 3.62(2) cm -1 , with this D value consistent with values reported previously for significantly distorted octahedral HS-Fe(III) complexes. 77,78 Efforts to fit the data with a negative D value afforded a poorer fit. Definitive determination of the sign of D might be possible with low temperature EPR spectroscopy.…”

Section: Solid State Magnetic Measurementsmentioning

confidence: 99%

Valence tautomerism and spin crossover in pyridinophane–cobalt–dioxolene complexes: an experimental and computational study

et al. 2019

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Section: Solid State Magnetic Measurementsmentioning

confidence: 99%

Valence tautomerism and spin crossover in pyridinophane–cobalt–dioxolene complexes: an experimental and computational study

et al. 2019

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“…Magnetic susceptibilities are a very useful technique for determining the stereochemistry of metal ions in complexes . They also provide essential information about the number of unpaired electrons, leading to the determination of the geometry of complexes . The magnetic moment readings were the range 4.67–4.79 BM, specifying their paramagnetic nature owing to the presence of three unpaired electrons, which also implies octahedral geometry for Co(II) complexes .…”

Section: Resultsmentioning

confidence: 99%

Synthesis, characterization, and biological screening of metal complexes of novel sulfonamide derivatives: Experimental and theoretical analysis of sulfonamide crystal

Sumrra

Hassan

Imran

et al. 2020

Applied Organom Chemis

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This study reports the synthesis of sulfonamide‐derived Schiff bases as ligands L1 and L2 as well as their transition metal complexes [VO(IV), Fe(II), Co(II), Ni(II), Cu(II), and Zn(II)]. The Schiff bases (4‐{E‐[(2‐hydroxy‐3‐methoxyphenyl)methylidene]amino}benzene‐1‐sulfonamide (L1) and 4‐{[(2‐hydroxy‐3‐methoxyphenyl)methylidene]amino}‐N‐(5‐methyl‐1,2‐oxazol‐3‐yl)benzene‐1‐sulfonamide (L2) were synthesized by the condensation reaction of 4‐aminobenzene‐1‐sulfonamide and 4‐amino‐N‐(3‐methyl‐2,3‐dihydro‐1,2‐oxazol‐5‐yl)benzene‐1‐sulfonamide with 2‐hydroxy‐3‐methoxybenzaldehyde in an equimolar ratio. Sulfonamide core ligands behaved as bidentate ligands and coordinated with transition metals via nitrogen of azomethine and the oxygen of the hydroxyl group. Ligand L1 was recovered in its crystalline form and was analyzed by single‐crystal X‐ray diffraction technique which held monoclinic crystal system with space group (P21/c). The structures of the ligands L1and L2 and their transition metal complexes were established by their physical (melting point, color, yields, solubility, magnetic susceptibility, and conductance measurements), spectral (UV–visible [UV–Vis], Fourier transform infrared spectroscopy, 1H NMR, 13C NMR, and mass analysis), and analytical (CHN analysis) techniques. Furthermore, computational analysis (vibrational bands, frontier molecular orbitals (FMOs), and natural bonding orbitals [NBOs]) were performed for ligands through density functional theory utilizing B3LYP/6‐311+G(d,p) level and UV–Vis analysis was carried out by time‐dependent density functional theory. Theoretical spectroscopic data were in line with the experimental spectroscopic data. NBO analysis confirmed the extraordinary stability of the ligands in their conjugative interactions. Global reactivity parameters computed from the FMO energies indicated the ligands were bioactive by nature. These procedures ensured the charge transfer phenomenon for the ligands and reasonable relevance was established with experimental results. The synthesized compounds were screened for antimicrobial activities against bacterial (Streptococcus aureus, Bacillus subtilis, Eshcheria coli, and Klebsiella pneomoniae) species and fungal (Aspergillus niger and Aspergillus flavous) strains. A further assay was designed for screening of their antioxidant activities (2,2‐diphenyl‐1‐picrylhydrazine radical scavenging activity, total phenolic contents, and total iron reducing power) and enzyme inhibition properties (amylase, protease, acetylcholinesterase, and butyrylcholinesterase). The substantial results of these activities proved the ligands and their transition metal complexes to be bioactive in their nature.

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Synthesis, characterization and X-ray crystal structure of an iron(III) complex of a tripodal pyridoxal Schiff base ligand: effects of positional disorder on its magnetic properties

et al. 2018

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Synthesis, characterization and magnetic study of two new octahedral iron(III) complexes with pendant zwitterionic Schiff bases

Abstract: Research paper Synthesis, characterization and magnetic study of two new octahedral iron(III) complexes with pendant zwitterionic Schiff bases

Cited by 15 publications

References 68 publications

Valence tautomerism and spin crossover in pyridinophane–cobalt–dioxolene complexes: an experimental and computational study

Valence tautomerism and spin crossover in pyridinophane–cobalt–dioxolene complexes: an experimental and computational study

Synthesis, characterization, and biological screening of metal complexes of novel sulfonamide derivatives: Experimental and theoretical analysis of sulfonamide crystal

Synthesis, characterization and X-ray crystal structure of an iron(III) complex of a tripodal pyridoxal Schiff base ligand: effects of positional disorder on its magnetic properties

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