Hydrazone Schiff base-manganese(II) complexes: Synthesis, crystal structure and catalytic reactivity

Pouralimardan, Omid; Chamayou, Anne‐Christine; Janiak, Christoph; Hosseini‐Monfared, Hassan

doi:10.1016/j.ica.2006.08.056

Cited by 296 publications

(145 citation statements)

References 54 publications

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“…Also there is a report on the synthesis, crystal structures and spectral properties of nickel(II) complex of 2-formylpyridine semicarbazone [10]. The choice of di-2-pyridyl ketone is mainly due to the fact that this heteroaromatic moiety can provide a further binding site for metal cations [11][12][13]. It is rigid, and provides two aromatic nitrogens whose unshared electron pairs are beautifully placed to act co-operatively in binding cations.…”

Section: Introductionmentioning

confidence: 99%

Copper(II) complexes derived from di-2-pyridyl ketone-N4-phenyl-3-semicarbazone: Synthesis and spectral studies

Reena

Kurup

2010

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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(5) of di-2-pyridyl ketone-N 4 -phenyl-3-semicarbazone (HL) were synthesized and characterized by elemental analyses and electronic, infrared and EPR spectral techniques. In all these complexes the semicarbazone undergoes deprotonation and coordinates through enolate oxygen, azomethine and pyridyl nitrogen atoms. All the complexes are EPR active due to the presence of an unpaired electron. EPR spectra of all the complexes in DMF at 77 K suggest axial symmetry and the presence of half field signals for the complexes 1 and 3 indicates dimeric structures.

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Section: Introductionmentioning

confidence: 99%

Copper(II) complexes derived from di-2-pyridyl ketone-N4-phenyl-3-semicarbazone: Synthesis and spectral studies

Reena

Kurup

2010

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…The considerable high δ of these hydrogen chemical shifts is related to the proton-attachment to high electronegative atoms (oxygen and nitrogen). This assignment is supported by the apparent intensity decrease of these signals in the deuterated ligand spectrum [43][44][45]. These findings clarified that the ligand exhibits the keto form only and no evidence for the presence of the enol form.…”

Section: Nmr Spectramentioning

confidence: 76%

“…Two bands observed at 1641 and 1605 cm -1 related to the two C=N of imine and oxime groups [49], while the bands observed at 1144 and 1025 cm -1 were attributed to the υN-O group [50]. The Presence of NH groups was supported by the bands recorded at 3338, 3290 and 3260 cm -1 [51][52][53]. Based on variation in the IR spectra of the metal complexes in comparison to that of the ligand, it could be presumed that the ligand performed either as a neutral (bidentate or tridentate), or monobasic .…”

Section: Nmr Spectramentioning

confidence: 99%

Preparation, characterization and Microbicide activities of N'-((3-(hydroxyimino)butan-2-ylidene)-2-(phenylamino)acetohydrazide and its complexes

et al. 2017

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, UO 2 2+ and VO 3 -). The ligand, N'-((3-(hydroxyimino) butan-2-ylidene)-2-(phenylamino)acetohydrazide was prepared by refluxing an equimolar amount of phenyl amino acetohydrazide with 2,3-butanedione monoxime. The synthesized compounds were characterized using elemental and thermal analyses, NMR, IR, U.V spectroscopy, magnetic and conductance measurements. The results demonstrated that complexes (2), (3), (5-7), (10) and (12) were formed in 1L:1M molar ratio. Complexes (4), (8), (9), (13) and (14) were found to afford M 2 L formulae while complex (11) adopted ML 2 formulae. The ligand acted as a neutral (bidentate [11], tridentate [6,7], monobasic (tridentate [2,3,5,12]), dibasic (tridentate [10], tetradentate [4,8,9,13,14]) chelating to the metal ions via nitrogen atoms of aceto-amino and azomethine groups, carbonyl oxygen atom in its enolic or ketonic form and/or protonated or deprotonated oximino nitrogen atom, adopting an octahedral, tetrahedral or square planar geometry around metal ions. The antimicrobial activity of the ligand, as well as the metal complexes, was examined using Amphotericin B and Amoxicillin as drugstandards against Aspergillus niger (A.niger) and Escherichia coli (E. coli) ,respectively. The ligand demonstrates a high cytotoxicity against A.niger whereas it recorded a moderate activity against E. coli. It is interestingly found that zinc(II) complex (6), copper(II) complexes (8) and (10) recorded higher activities than the Amphotericin B drug with 122%, 116% and 111.1% percentages respectively against A.niger. Zinc(II) complex (6) was also the most sensitive complex against E. coli with (94.1 %) comparable to Amoxicillin.

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“…In the last few years, the compounds derived from the condensation reactions of carbonyl-containing compounds with substituted benzohydrazides have received considerable attention [1][2][3][4]. In this paper the title compound (Fig.…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of N’-(3-bromo-2-hydroxybenzylidene)-4-methylbenzohydrazide methanol solvate, C16H17BrN2O3

Liu

2012

Zeitschrift für Kristallographie - New Crystal Structures

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C 16 H 17 BrN 2 O 3 ,t riclinic, P1 (no. 2), a =7 .338(2) Å, b =9 .210(2) Å,c =1 2.718(2) Å,a =9 7.981(2)°, Source of materialThetitle compound was synthesized by the reaction of 3-bromo-2-hydroxybenzaldehyde (1 mmol, 0.20 g) with 4-methylbenzohydrazide (1 mmol, 0.15 g) in absolute methanol (30 ml)a t ambient condition. Colourless needle-shaped single crystals were obtained by slow evaporation of the solution at room temperature afterseveral days. Experimental detailsTheamide Hatomwas locatedinadifferencemap andwas refined isotropically, with N-H =0.90(1) Å. Theremaining Hatomswere positioned geometrically and allowed to ride on their parent atoms, with C-H =0.93 Åfor aromatic and CH and 0.96 Å for CH 3 atoms, and with O-H =0.82 Å. The U iso values were constrained to be 1.5U eq of the carrier atom for methyl and hydroxyl Hatoms and 1.2U eq for the remaining Hatoms. Arotating group model was used for the methyl groups.

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Hydrazone Schiff base-manganese(II) complexes: Synthesis, crystal structure and catalytic reactivity

Cited by 296 publications

References 54 publications

Copper(II) complexes derived from di-2-pyridyl ketone-N4-phenyl-3-semicarbazone: Synthesis and spectral studies

Copper(II) complexes derived from di-2-pyridyl ketone-N4-phenyl-3-semicarbazone: Synthesis and spectral studies

Preparation, characterization and Microbicide activities of N'-((3-(hydroxyimino)butan-2-ylidene)-2-(phenylamino)acetohydrazide and its complexes

Crystal structure of N’-(3-bromo-2-hydroxybenzylidene)-4-methylbenzohydrazide methanol solvate, C16H17BrN2O3

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