Syntheses, structural characterizations, and catalytic activities of manganese(II)-aroylhydrazone complexes

Nishana, Lahinakillathu; Sakthivel, Ayyamperumal; Kurup, M.R. Prathapachandra

doi:10.1016/j.molstruc.2023.135128

Cited by 14 publications

(41 citation statements)

References 70 publications

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“…In the IR spectra of the aroylhydrazones, prominent vibrational bands associated with ν (N–H) and ν (CO) are found at 3450 and 1674 cm −1 for DKMBH·H 2 O and at 3464 and 1661 cm −1 for APMBH·H 2 O, confirming the presence of the amido form of the aroylhydrazone in the solid state. 53,55 The in-plane N–H deformation is observed at 1184 cm −1 for DKMBH·H 2 O and at 1178 cm −1 for APMBH·H 2 O. In addition to this, the out-of-plane N–H deformation is assigned to the bands at 480 and 467 cm −1 for DKMBH and APMBH respectively.…”

Section: Resultsmentioning

confidence: 86%

“…Di-2-pyridyl ketone-4-methoxybenzhydrazone monohydrate was prepared by condensation of di-2-pyridyl ketone and 4-methoxybenxhydrazide in solvent methanol as per the reported method (Scheme S1, ESI†). 52,53…”

Section: Methodsmentioning

confidence: 99%

“…1 H NMR (400 MHz, DMSO-d 6 ): δ (ppm) 7.06–7.90 (m, aromatic protons), 7.90 (d, 1H, proton near to ring nitrogen), 8.60 (d, 1H, proton near to ring nitrogen), 10.98 (s, 1H, iminolic proton (HN–N)), 3.85 (s, 3H, methoxy proton (OCH 3 )). 52,53…”

Section: Methodsmentioning

confidence: 99%

“…The downfield singlet noted at 15.33 and 10.98 ppm is characteristic of the iminolic forms of the aroylhydrazones, DKMBHÁH 2 O and APMBHÁH 2 O respectively. 53,61…”

Section: H Nmr Spectrum Of Aroylhydrazonementioning

confidence: 99%

“…These non-covalent interactions are evident from the reported literature. 53,55 Three significant intermolecular hydrogen bonding interactions are present in this complex: one is between the oxygen atom O3 from the coordinating nitrate ion and hydrogen H3A attached to oxygen O3 in the coordinating water molecule with a donoracceptor distance of 2.785 Å (symm.op = À1 + x, y, z); the second one is between the azomethine nitrogen N4 and hydrogen H3B attached to the oxygen O3 in the coordinating water molecule with a donor-acceptor distance of 2.852 Å (symm.op = 1 À x, Ày, 2 À z); and the third one is between the oxygen atom of the nitrate ion and hydrogen H3 attached to the carbon C3 present in the pyrazine ring with a donor-acceptor distance of 3.181 Å (symm.op = x, y, 1 + z). And all are classical hydrogen bonding interactions (Fig.…”

Section: Thermal Analysis Of the Synthesized Compoundsmentioning

confidence: 99%

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Synthesis, spectral characterization, and catalytic efficiency of aroylhydrazone-based Cu(ii) complexes

Nishana,

Sakthivel,

Kurup

et al. 2023

New J. Chem.

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Section: Resultsmentioning

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…The downfield singlet noted at 15.33 and 10.98 ppm is characteristic of the iminolic forms of the aroylhydrazones, DKMBHÁH 2 O and APMBHÁH 2 O respectively. 53,61…”

Section: H Nmr Spectrum Of Aroylhydrazonementioning

confidence: 99%

Section: Thermal Analysis Of the Synthesized Compoundsmentioning

confidence: 99%

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Synthesis, spectral characterization, and catalytic efficiency of aroylhydrazone-based Cu(ii) complexes

Nishana,

Sakthivel,

Kurup

et al. 2023

New J. Chem.

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Aroylhydrazone‐based nickel(II) complexes: Synthesis and their structural, density functional theory (DFT), biological and catalytic studies

Nishana,

Sakthivel,

Prathapachandra Kurup

et al. 2024

Applied Organom Chemis

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Nickel(II) complexes of tridentate NNO donor aroylhydrazones, viz., di‐2‐pyridyl ketone‐4‐methoxybenzhydrazone monohydrate (DKMBH·H2O) and 2‐acetylpyrazine‐4‐methoxybenzhydrazone monohydrate (APMBH·H2O), were synthesized and characterized using various methods, including spectral techniques (Fourier transform infrared [FT‐IR], UV–vis) and analytical methods (elemental and X‐ray diffraction [XRD] analysis). Single‐crystal XRD was used to elucidate the crystal structures of nickel(II) complexes 1 and 2. The XRD analysis revealed that the respective ligands coordinated to the Ni(II) center through the deprotonated iminolate form in complex 1 and the neutral amido form in complex 2, resulting in distorted octahedral geometries. The ground state electronic configurations of the complexes were studied using the B3LYP/UB3LYP levels of DFT. Using absorption spectral titration methods, the interactions of complexes with CT‐DNA and bovine serum albumin (BSA) protein were examined. The observed data demonstrate that the complexes adopt an intercalative binding mode to bind to CT‐DNA and BSA protein. Additionally, the antioxidant activity of the nickel(II) complexes and their ligands was determined using 1,1‐diphenyl‐2‐picrylhydrazyl (DPPH). Complex 2 demonstrated the highest radical scavenging activity of the compounds studied (IC50 = 3.81 mM). Furthermore, molecular docking studies were performed to understand how the complexes can interact with the SARS‐CoV‐2 main protease. The results revealed that complex 2 had the highest docking score (−8.18 kcal/mol) when compared with the other complexes under study. Aside from their biological properties, the nickel complexes heterogenized on functionalized SBA‐15 showed promising catalytic activity, achieving 98% yield in the reduction of nitrobenzene, forming exclusively aniline as the end product.

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Manganese(II) complexes based on pyridyl- and quinolyl-containing dialkylphosphine oxides

Enikeeva,

Litvinov,

Islamov

et al. 2024

Inorganica Chimica Acta

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Syntheses, structural characterizations, and catalytic activities of manganese(II)-aroylhydrazone complexes

Cited by 14 publications

References 70 publications

Synthesis, spectral characterization, and catalytic efficiency of aroylhydrazone-based Cu(ii) complexes

Synthesis, spectral characterization, and catalytic efficiency of aroylhydrazone-based Cu(ii) complexes

Aroylhydrazone‐based nickel(II) complexes: Synthesis and their structural, density functional theory (DFT), biological and catalytic studies

Manganese(II) complexes based on pyridyl- and quinolyl-containing dialkylphosphine oxides

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