Synthesis, structural characterization and antioxidant activity of some vanadium(IV), Mo(VI)/(IV) and Ru(II) complexes of pyridoxal Schiff base derivatives

Elsayed, Shadia A.; Noufal, Aya M.; El‐Hendawy, Ahmed M.

doi:10.1016/j.molstruc.2017.05.020

Cited by 51 publications

(28 citation statements)

References 62 publications

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“…In the spectra of all complexes, the bands corresponding to ν(NH) and ν(C─S) were absent, and a new band was observed for ν(C─S) at 727–767 cm −1 revealing that the coordination takes place through a thiolate sulfur after enolization and deprotonation: (─N─C─S) thiol form (Scheme b). This is also confirmed by the appearance of a new azomethine band near 1600 cm −1 , and the shift of ν(N─N) band to higher wavenumber . The bands due azomethine were shifted to lower energies implying the involvement of azomethine‐N in coordination.…”

Section: Resultsmentioning

confidence: 52%

“…The new bands appearing in the range 449–472 cm −1 are due to ν(M─N), while that of ν(M─O) is near 500 cm −1 . For the VO(IV) complexes, the new bands observed at 960–970 cm −1 are attributed to ν(V─O) . Moreover, the bands due to phen and bpy appear at 1580, 1515, 1495 and 1420 cm −1 .…”

Section: Resultsmentioning

confidence: 88%

“…The strong absorption band located at 1918–1946 cm −1 in the spectra of the complexes is attributed to coordination of terminal CO . Further strong bands appearing near 1090 and 740 cm −1 are attributed to ν(PPh 3 ) vibrations …”

Section: Resultsmentioning

confidence: 91%

“…All the oxovanadium(IV) complexes were synthesized following a general procedure based on literature methods …”

Section: Methodsmentioning

confidence: 99%

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Oxovanadium(IV) and ruthenium(II) carbonyl complexes of ONS‐donor ligands derived from dehydroacetic acid and dithiocarbazate: Synthesis, characterization, antioxidant activity, DNA binding and in vitro cytotoxicity

Sarhan

Elsayed

Mashaly

et al. 2018

Applied Organom Chemis

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A series of new complexes of oxovanadium(IV) [VO(L)(B)] and ruthenium(II) [Ru(CO)(PPh3)2(L)] (1.1- 1.3, 2.1–2.3) (H2L = dehydroacetic acid Schiff base of S‐methyldithiocarbazate, H2smdha (1) or S‐benzyldithiocarbazate, H2sbdha (2); B = 2,2′‐bipyridine (bpy) or 1,10‐phenanthroline (phen)) have been synthesized. The structure of these complexes was authenticated using elemental analyses and spectroscopic techniques, and their magnetic properties and electrochemical behaviour were studied. The molecular structures of oxovanadium(IV) complexes [VO(smdha)(bpy)]⋅CH2Cl2 (1.1) and [VO(sbdha)(phen)]⋅2H2O (2.2) were confirmed using single‐crystal X‐ray crystallography. Analytical data showed that the ligands 1 and 2 are chelated to the metal centres in a bi‐negative tridentate fashion through azomethine N, thiol S and deprotonated hydroxyl group. The antioxidant activity of the synthesized compounds was tested against 2,2‐diphenyl‐1‐picrylhydrazyl) radical, which showed that the complexes demonstrate a better scavenging activity than their corresponding ligands. The cupric ion reducing antioxidant capacity method was also employed and the total equivalent antioxidant capacity values were found to be higher for the oxovandium(IV) complexes. DNA binding affinity of the compounds was determined using UV–visible and fluorescence spectra, revealing an intercalation binding mode. Higher cytotoxicity for the complexes compared to their ligands was found against human liver hepatocellular carcinoma (HepG2) and breast adenocarcinoma (MCF7) cell lines using MTT assay.

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Section: Resultsmentioning

confidence: 52%

Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 91%

“…All the oxovanadium(IV) complexes were synthesized following a general procedure based on literature methods …”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Oxovanadium(IV) and ruthenium(II) carbonyl complexes of ONS‐donor ligands derived from dehydroacetic acid and dithiocarbazate: Synthesis, characterization, antioxidant activity, DNA binding and in vitro cytotoxicity

Sarhan

Elsayed

Mashaly

et al. 2018

Applied Organom Chemis

Self Cite

View full text Add to dashboard Cite

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“…A careful comparison of these bands with the electronic spectra of complexes showed that there was an increase in intensity and a decrease in frequency due to extended conjugation in the ligand after complexation. Further, weak bands appearing at 319 and 422 nm were attributed to the metal-to-ligand charge transfer transitions (MLCT), transitions arising possibly due to transfer of electron from the filled d-orbital of coordinated oxygen to the vacant d-orbital of metal [33,34].…”

Section: Electronic Spectra Magnetic Moment and Molar Conductivitymentioning

confidence: 99%

Synthesis, characterization and antioxidant activity of Schiff base and its metal complexes with Fe(II), Mn(II), Zn(II), and Ru(II) ions: Catalytic activity of ruthenium(II) complex

Turan

Buldurun

2018

Eur. J. Chem.

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The synthesis, spectral, catalytic and antioxidant properties of ethyl-2-(2-hydroxy-3-methoxybenzylideneamino)-6-methyl-4,5,6-tetrahydrobenzo[b]thiophene-3-carboxylate (L) substituted iron(II), manganese(II), zinc(II), and ruthenium(II)-arene chlorides are described for the first time. The ligand and its metal complexes were characterized by elemental analysis, molar conductance, magnetic susceptibility measurements, and spectral ( 1 H NMR, 13 C NMR, FT-IR, UV-Vis and Mass) techniques. The FT-IR spectra showed that the ligand can act as bidentate or tridentate. Magnetic moments and electronic spectral studies revealed an octahedral geometry for all the complexes obtained. The thermal behavior of the complexes showed that the water molecules were separated in the first step followed immediately by decomposition of the anions and ligand molecules in the subsequent steps. Ru(II) complex was used as catalysts for the transfer hydrogenation of ketones. At the same time, the effect of various bases such as NaOH, KOH, KOBu t and NaOAc as organic base were investigated in the transfer hydrogenation of ketones by 2-propanol as the hydrogen source.The complexes and ligand were tested in vitro for their antioxidant activity. The experimental results showed that Ru(II) complex had more potent antioxidant activities than Zn(II), Fe(II), Mn(II) complexes and parent ligand.

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New magnetic supported hydrazone Schiff base dioxomolybdenum (VI) complex: An efficient nanocatalyst for epoxidation of cyclooctene and norbornene

Sarkheil

Lashanizadegan

2018

Applied Organom Chemis

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A new dioxomolybdenum (VI) complex with tridentate hydrazone Schiff base ligand (H2L) derived from 2‐hydroxy‐5‐nitrobenzaldehyde and benzhydrazide was synthesized and designated as [MoO2L (DMF)]·2H2O. The Fe3O4@SiO2‐CPS‐L‐MoO2 (EtOH) nanocatalyst was successfully prepared by grafting H2L ligand on modified Fe3O4 nanoparticles followed by reacting with MoO2 (acac)2. The complex and nanocatalyst were characterized by various techniques such as elemental analysis, mass, FT‐IR, UV–Vis, 1H NMR, 13C{1H}‐NMR, TGA, XRD, XPS, TEM, SEM and VSM. The catalytic activity of [MoO2L (DMF)]2H2O and Fe3O4@SiO2‐CPS‐L‐MoO2 (EtOH) were evaluated for the oxidation of various alkenes (cyclooctene, norbornene, cyclohexene, styrene and α‐methyl styrene) in the presence of tert‐butylhydroperoxide as oxidant. The results revealed that the catalysts were especially efficient for oxidation of cyclooctene and norbornene with 100% selectivity towards corresponding epoxide product. Fe3O4@SiO2‐CPS‐L‐MoO2 (EtOH) showed higher catalytic activity, shorter reaction time and higher turnover number (TON) compared with homogeneous complex [MoO2L (DMF)]·2H2O. Moreover, simple magnetic recovery from the reaction mixture and reuse for several times with no significant loss in activity were other advantages of the nanocatalyst.

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Synthesis, structural characterization and antioxidant activity of some vanadium(IV), Mo(VI)/(IV) and Ru(II) complexes of pyridoxal Schiff base derivatives

Cited by 51 publications

References 62 publications

Oxovanadium(IV) and ruthenium(II) carbonyl complexes of ONS‐donor ligands derived from dehydroacetic acid and dithiocarbazate: Synthesis, characterization, antioxidant activity, DNA binding and in vitro cytotoxicity

Oxovanadium(IV) and ruthenium(II) carbonyl complexes of ONS‐donor ligands derived from dehydroacetic acid and dithiocarbazate: Synthesis, characterization, antioxidant activity, DNA binding and in vitro cytotoxicity

Synthesis, characterization and antioxidant activity of Schiff base and its metal complexes with Fe(II), Mn(II), Zn(II), and Ru(II) ions: Catalytic activity of ruthenium(II) complex

New magnetic supported hydrazone Schiff base dioxomolybdenum (VI) complex: An efficient nanocatalyst for epoxidation of cyclooctene and norbornene

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