Synthesis, characterization and structure assessment of mononuclear and binuclear low-spin manganese(II) complexes derived from oxaloyldihydrazones, 1,10-phenanthroline and 2,2′-bipyridine

Syiemlieh, Ibanphylla; Kumar, Arvind; Kurbah, Sunshine D.; Lal, Ram A.

doi:10.1016/j.molstruc.2018.04.043

Cited by 10 publications

(5 citation statements)

References 71 publications

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“…In the UV‐area, H 2 L1 and H 2 L2 exhibited two characteristic high‐energy bands of π → π* transition at 248 and 249 nm and n → π* transition at 326 and 291 nm, respectively. Moreover, an observable absorption band at 393 and 353 nm for H 2 L1 and H 2 L2, respectively, due to the electronic transition of the ligand charge transfer . The binding of the coordinated ligands to cis ‐(MoO 2 ) 2+ ions caused an observable shift of the above characteristic bands.…”

Section: Resultsmentioning

confidence: 98%

“…Dihydrazones are the most common chelating ligands for the coordination with transition metal ions of different oxidation states. In this context, aroyldihydrazones, specifically oxalyldihydrazones, are stereochemically and geometrically reactive, providing highly stable metal complexes of wide applications in different scientific areas (e.g. biological chemosensors and organic photovoltaic materials).…”

Section: Introductionmentioning

confidence: 99%

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Bis‐dioxomolybdenum (VI) oxalyldihydrazone complexes: Synthesis, characterization, DFT studies, catalytic epoxidation potential, molecular modeling and biological evaluations

Adam

Ahmed

Elhady

et al. 2020

Applied Organom Chemis

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Two cis‐bis‐dioxomolybdenum oxalylsalicylidenedihydrazone complexes (MoO2L1 and MoO2L2) were synthesized via the complexation of dioxomolybdenum (VI) acetylacetonate with oxalylsalicylidenedihydrazone (H2L1) and p‐sodium sulfonate oxalylsalicylidenedihydrazone (H2L2) bis‐Schiff base chelating ligands, respectively. The structures of the newly synthesized complexes were confirmed by 1H‐ and 13C‐NMR, IR, ultraviolet–visible and mass spectra, as well as elemental analyses (EA) and conductivity measurements. The spectrophotometric continuous variation method revealed the formation of 2: 1 (metal: ligand molar ratios). DFT studies were applied for the ligands and their Mo‐chelates. Interestingly, the bis‐MoO2(VI) oxalyldihydrazone complexes showed remarkable catalytic sufficiency towards the selective (ep)oxidation of 1,2‐cyclooctene, benzyl alcohol and thiophene using H2O2 or tert‐butyl hydroperoxide (tBuOOH) at 85 °C. Under aqueous conditions, the MoO2L2 (with p‐sodium sulfonate substituent) exhibited superior that of the MoO2L1 (without p‐NaSO3―group), highlighting the role of sodium sulfonate substituent in the catalytic progress of the Mo‐chelate. The ligands (H2L1 and H2L2) and their corresponding Mo‐complexes (MoO2L1 and MoO2L2) were assessed for their antitumor and antimicrobial activities. Furthermore, the antioxidant activity was also evaluated using the 2,2‐diphenyl‐1‐picrylhydrazyl (DPPH) and superoxide dismutase (SOD) assays. The binding nature between the Mo‐complexes and calf thymus DNA (ctDNA) was also studied within spectroscopic and hydrodynamic techniques.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Bis‐dioxomolybdenum (VI) oxalyldihydrazone complexes: Synthesis, characterization, DFT studies, catalytic epoxidation potential, molecular modeling and biological evaluations

Adam

Ahmed

Elhady

et al. 2020

Applied Organom Chemis

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“…Hydrazones that are recently recognized as polyfunctional ligands have a high tendency to form stable metal complexes with d-block elements like Mn(II) due to its complexing ability through keto-enol tautomerism and availability of donor sites [4]. Although many hydrazone complexes of transition metals [M = Co II , Ni II , Cu II , Mn II , Pd II , Ru II and V IV ] are being investigated [5,6], only very few papers on aryl oxalic dihydrazone complexes were published [7,8]. This may be due to the weak dissolvability of oxalic dihydrazone ligands in commonly used organic solvents.…”

Section: Introductionmentioning

confidence: 99%

N,N′-Bis[2-hydroxynaphthylidene]/[2-methoxybenzylidene]amino]oxamides and their divalent manganese complexes: Isolation, spectral characterization, morphology, antibacterial and cytotoxicity against leukemia cells

Ahmed

2020

Open Chemistry

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AbstractManganese(ii) complexes of oxalic dihydrazones {N,N′-bis[2-hydroxynaphthylidene]amino]oxamide (BHO) and N,N′-bis[2-methoxybenzylidene]amino]oxamide (BMO)} have been synthesized by a general methodology. Hydrazone ligands (BHO and BMO) were obtained by the condensation of oxalic dihydrazide with 2-hydroxynaphthalene-1-carbaldehyde and 2-methoxybenzaldehyde. From the data obtained from the spectral (mass, IR, 1H-NMR, UV-Vis, ESR), magnetic and thermal measurements in addition to the elemental analyses (CHNM), the structures of ligands and their complexes have been determined. The scanning electron microscope (SEM) was used to characterize the morphology of the complex surface. The ligands coordinated with the metal center in a bi-dentate way forming binuclear Mn–BHO and mononuclear Mn–BMO complexes. The manganese complexes are proposed to have octahedral stereochemistry. The ligands and manganese(ii) complexes have been assessed for their antibacterial and antileukemia activities. The proliferation hindrance for the free ligands was enhanced upon coordination with the manganese(ii) ions.

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“…The ligand 1,10phenanthroline often used in complex compounds because it's exhibit good ability to coordinate bonds with metal ions (6). Ion of Fe(III), Ni(II) and Zn(III) are ions of transition metals that can form complexes with ligand 1,10-phenanthroline (7,8). Interaction between metal ions with two lone pairs electrons in ligand 1,10-phenanthroline forms complexes bound to coordinate with different molecular geometries (9,10).…”

Section: Introductionmentioning

confidence: 99%

Study of Electronic Transition of Complex Fe (III), Ni (II) and Zn (II)-1.10-Phenanthroline: Modelling and UV-Vis Spectra Analysis

Rakhman

Zam

Umar

et al. 2020

Journal of the Turkish Chemical Society Section A: Chemistry

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Geometric modeling and geometric optimization of Fe(III)-1,10-phenantroline (Fe-Phen), Ni II)-1,10-phenantroline (Ni-Phen) and Zn(II)-1,10-phenantroline (Zn-Phen) compounds have been carried out computing using the semi-empirical method of PM3. The spectral measurements and the study of complex electronic compositions using the UV-Vis spectrophotometer and simulation of ZINDO/s (Zerner's Neglect of Differential Overlap) calculations. The optimum result of the geometry of complex molecule found there is a change of charge in each complex with stable energy. The UV-Vis spectra measurements showed λmax in the Fe-Phen complex: 315.50 nm, Ni-Phen complex: 325.00 nm and Zn-Phen complex: 315.00 nm. The electronic transition occurring at these three complexes shows the transition characteristics of electrons at the level of the molecular orbitals π to π* and the degree of the molecular orbitals n to π⃰. Electron transition energy in complex orbital molecules can be observed in the energy changes of each molecular orbitals.

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Synthesis, characterization and structure assessment of mononuclear and binuclear low-spin manganese(II) complexes derived from oxaloyldihydrazones, 1,10-phenanthroline and 2,2′-bipyridine

Cited by 10 publications

References 71 publications

Bis‐dioxomolybdenum (VI) oxalyldihydrazone complexes: Synthesis, characterization, DFT studies, catalytic epoxidation potential, molecular modeling and biological evaluations

Bis‐dioxomolybdenum (VI) oxalyldihydrazone complexes: Synthesis, characterization, DFT studies, catalytic epoxidation potential, molecular modeling and biological evaluations

N,N′-Bis[2-hydroxynaphthylidene]/[2-methoxybenzylidene]amino]oxamides and their divalent manganese complexes: Isolation, spectral characterization, morphology, antibacterial and cytotoxicity against leukemia cells

Study of Electronic Transition of Complex Fe (III), Ni (II) and Zn (II)-1.10-Phenanthroline: Modelling and UV-Vis Spectra Analysis

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