Syntheses, characterization, and catalytic potential of novel vanadium and molybdenum Schiff base complexes for the preparation of benzimidazoles, benzoxazoles, and benzothiazoles under thermal and ultrasonic conditions

Kargar, Hadi; Kargar, Khadijeh; Fallah‐Mehrjardi, Mehdi; Munawar, Khurram Shahzad

doi:10.1007/s00706-021-02780-0

Cited by 19 publications

(4 citation statements)

References 63 publications

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“…It was established that the peak of the other protonated OH is hidden and relatively unshielded compared to the other OH proton, this is due to intramolecular hydrogen bonding with the azo group of the ligand [39] . While the singlet signal that appeared at δ 11.2 ppm is denoted to −NH proton [28,40] . The observed singlet signal appeared at δ 9.14 ppm is relative to of (CH=N) proton [41] .…”

Section: Resultsmentioning

confidence: 98%

“…This step is observed at (260–638 °C) with strong DTG peaks at (431 and 369 °C). The definitive decomposition product is metal oxide polluted with carbon [26,40,55] …”

Section: Resultsmentioning

confidence: 99%

“…[39] While the singlet signal that appeared at δ 11.2 ppm is denoted to À NH proton. [28,40] The observed singlet signal appeared at δ 9.14 ppm is relative to of (CH=N) proton. [41] Furthermore, the signals characterized by protons of pyridine and phenyl rings appear as multiplet signals at range δ (6.93-8.82 ppm).…”

Section: H-nmr Spectrum Of Ligandmentioning

confidence: 98%

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Bivalent Metal Chelates with Pentadentate Azo‐Schiff Base Derived from Nicotinic Hydrazide: Preparation, Structural Elucidation, and Pharmacological Activity

Abouel‐Enein

Emam

Abdel‐Satar

2023

Chemistry & Biodiversity

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Azo‐Schiff base ligand (N′‐((E)‐2‐hydroxy‐5‐((E)‐(2‐hydroxyphenyl)diazenyl)benzylidene)nicotinohydrazide) and its Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Pd(II) chelates were prepared and elucidated. The geometrical structures of the prepared chelates were characterized by several spectroanalytical techniques and thermogravimetric analysis. The obtained data revealed that the chelates have (1M:1L), (1M:2L), (1M:3L), and (1M:4L) molar ratios. The infrared spectra displayed that the H2L ligand behaves in a pentacoordinate fashion in chelates of Mn(II), Ni(II), and Cu(II) ions. However, in Zn(II) and Pd(II) chelates, the ligand is coordinated as a tetradentate species (NONO) through nitrogen atoms of azomethine and azo groups as well as oxygen atoms of phenolic hydroxy, and carbonyl groups. Besides, it was concluded that the oxygen atoms of carbonyl and hydroxy groups along with the azomethine nitrogen atom of the ligand are bounded with Co(II) ion in metal chelate (2). According to the measured molar conductance values, the chelates of Cu(II), Zn(II), and Pd(II) are weak electrolytes, but Mn(II), Co(II), and Ni(II) chelates are ionic. The azo‐Schiff base ligand and its prepared metal chelates were tested for their antioxidant and antibacterial properties. The Ni(II) chelate was found to be considered an effective antioxidant agent. In addition, the available antibacterial data suggest that the Ni(II) and Co(II) chelates may be employed as inhibitor agents against Proteus vulgaris, Escherichia coli, and Bacillus subtilis bacteria. Furthermore, the data showed that, in comparison to the ligand and other metal chelates, copper(II) chelate (4) exhibited higher action against Bacillus subtilis bacteria.

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Section: Resultsmentioning

confidence: 98%

“…This step is observed at (260–638 °C) with strong DTG peaks at (431 and 369 °C). The definitive decomposition product is metal oxide polluted with carbon [26,40,55] …”

Section: Resultsmentioning

confidence: 99%

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Bivalent Metal Chelates with Pentadentate Azo‐Schiff Base Derived from Nicotinic Hydrazide: Preparation, Structural Elucidation, and Pharmacological Activity

Abouel‐Enein

Emam

Abdel‐Satar

2023

Chemistry & Biodiversity

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“…Although mono-substituted benzimidazole derivatives are mostly used in drug design but the use of di-substituted benzimidazoles are limited. Only few structure of the di-substituted benzimidazole derivatives are also reported in the literature [24] , [25] , [26] . Nevertheless, 5-membered heterocycle substituted benzimidazoles have a great impact in therapeutic actions against bacterial, fungal and viral species [27] , [28] , [29] .…”

Section: Introductionmentioning

confidence: 99%

In silico anti-SARS-CoV-2 activities of five-membered heterocycle-substituted benzimidazoles

Mudi

Mahato

Verma

et al. 2022

Journal of Molecular Structure

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Humic acid: a rarely explored, robust, green catalyst for solvent-free synthesis of 4H-benzo[4,5]thiazolo[3,2-a]pyrimidine-3-carboxylate and benzo[d]thiazole

Nandi,

Mitra,

Ghosh

2024

Res Chem Intermed

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Syntheses, characterization, and catalytic potential of novel vanadium and molybdenum Schiff base complexes for the preparation of benzimidazoles, benzoxazoles, and benzothiazoles under thermal and ultrasonic conditions

Cited by 19 publications

References 63 publications

Bivalent Metal Chelates with Pentadentate Azo‐Schiff Base Derived from Nicotinic Hydrazide: Preparation, Structural Elucidation, and Pharmacological Activity

Bivalent Metal Chelates with Pentadentate Azo‐Schiff Base Derived from Nicotinic Hydrazide: Preparation, Structural Elucidation, and Pharmacological Activity

In silico anti-SARS-CoV-2 activities of five-membered heterocycle-substituted benzimidazoles

Humic acid: a rarely explored, robust, green catalyst for solvent-free synthesis of 4H-benzo[4,5]thiazolo[3,2-a]pyrimidine-3-carboxylate and benzo[d]thiazole

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