Composition and geometry of oxovanadium(IV) and (V)-aminoethanol–Schiff base complexes and stability of their peroxo complexes in solution

Ando, Ryuji; Nagai, Mayumi; Yagyu, Takeyoshi; Maeda, Masunobu

doi:10.1016/s0020-1693(03)00206-8

Cited by 22 publications

(8 citation statements)

References 23 publications

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“…In DMSO, the low concentration solution yields a much higher value of A = 173.9 × 10 −4 cm −1 (Table 3). This is close to the calculated value of A ,i of A = 178.5 × 10 −4 cm −1 for DMSO, 24 suggesting that the EPR spectrum shown in Fig. 6d is due to a fully solvent-coordinated V(IV)=O species.…”

Section: Solution Behavior Of Complexsupporting

confidence: 87%

A linear trinuclear mixed valence vanadium(v/iv/v) complex: synthesis, characterization, and solution behavior

et al. 2005

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The reaction between vanadium(III) acetylacetonate and N-hexanoylsalicylhydrazide (H3hshz) yields a linear trinuclear mixed valence vanadium(V/IV/V) complex, V3O3(hshz)2(OEt)2, 1 (where hshz3- is a triply deprotonated trianionic N-hexanoyl salicylichydrazidate), with a pseudo C2 symmetry. A V(IV)O2+ group is at the center of complex 1 and is spanned by two terminal vanadium(V) ions with a square pyramidal geometry bridged via hydrazido ligands. In the crystalline form, the oxo group of the central vanadium(IV) ion is weakly coordinated to one of the terminal square pyramidal vanadium(V) ions of the neighboring trinuclear complex to form a dimeric structure. These dimers are linked via bis mu-alkoxo bridges to form a one-dimensional zigzag chain structure. In chloroform or methylene dichloride, the weak linkages between the trinuclear complexes present in the crystalline form are broken, and only the mixed valence trinuclear complex can be identified. In dimethyl sulfoxide or dimethylformamide, the trinuclear complex partially dissociates, and the unligated ligands remain in equilibrium with the trinuclear complex.

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Section: Solution Behavior Of Complexsupporting

confidence: 87%

A linear trinuclear mixed valence vanadium(v/iv/v) complex: synthesis, characterization, and solution behavior

et al. 2005

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“…Using the additivity rule [45] a calculated value of A z = 169.9 Â 10 À4 cm À1 (C¼O 44.7 Â 10 À4 cm À1 , ArO À 38.6 Â 10 À4 cm À1 , O DMSO = 43.3 cm À1 [46]) has been obtained assuming that the two coordination water molecules have been replaced by two solvent molecules in the equatorial plane (DMSO). This value is in good agreement with the experimental A z value.…”

Section: Epr Spectrum In Solutionmentioning

confidence: 99%

Apigenin oxidovanadium(IV) cation interactions. Synthesis, spectral, bovine serum albumin binding, antioxidant and anticancer studies

Medina

Naso

Pérez

et al. 2017

Journal of Photochemistry and Photobiology A: Chemistry

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Continuing and expanding our previous work on flavonoid oxidovanadium(IV) (VO) metal complexes as possible anti-cancer agents, the VOapigenin compound was synthesized and characterized. An "acetylacetone-like" coordination through the C¼O and OÀ À moieties of the ligand to the metal center with one apigenin ligand per metal ion was assumed using different spectroscopies and elemental analysis as well as thermal measurements. The vibrational experimental spectrum of VOapigenin was supported by theoretical calculations. According to the structure of the flavonoid it exerted mild antioxidant properties that were enhanced by metal coordination. The compounds showed moderate anticancer activity on lung A549 and cervix HeLa cancer cell lines, displaying an incubation time dependent behavior. Cellular increase of reactive oxygen species (ROS) and glutathione depletion have been measured upon incubation with the compounds. These cell killing activities were reverted when natural antioxidants were incubated with the compounds and the addition of the antioxidant agent Nacetylcysteine generated depletion of the cellular ROS levels. Therefore, a stress oxidative mechanism of action has been assumed. Moreover, the compounds showed no toxicity against Artemia salina and were not mutagenic. Both apigenin and the complex could be transported and stored by bovine serum albumin with similar binding constants and mechanisms than other VOflavonoid complexes.

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“…e X-band ESR spectra of an oxovanadium(IV) complex was recorded in DMSO at room temperature and at nitrogen temperature (177 K). ESR spectra of the complexes were analyzed by the method of Mishra, Sand, and Ando et al [34,35] spectra show eight lines, which are due to hyper�ne splitting arising from the interaction of the unpaired electron with a 51 V nucleus having the nuclear spin . is con�rms the presence of a single oxovanadium(IV) cation as the metallic centre in the complex.…”

Section: Magnetic Moment Measurementsmentioning

confidence: 99%

New Insights into the Chemistry of Oxovanadium(IV) Complexes with N₄ Coordinating Ligands

Yadava

Yadav

Yadav³

et al. 2013

ISRN Inorganic Chemistry

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The syntheses of new oxovanadium(IV) complexes having general formula [VO(mac)]SO4 have been carried out by using in situ method of preparation where vanadyl ion acts as kinetic template for the ligands derived by condensation of 2,2′-pyridil with 1,2-diaminopropane and 1,3-diaminopropane. The complexes were characterized by elemental analyses, molar conductance, magnetic moments, and spectral (infrared, electronic, and electron spin resonance) data. All the oxovanadium(IV) complexes are five coordinate wherein derived ligands act as tetradentate chelating agents.

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Composition and geometry of oxovanadium(IV) and (V)-aminoethanol–Schiff base complexes and stability of their peroxo complexes in solution

Cited by 22 publications

References 23 publications

A linear trinuclear mixed valence vanadium(v/iv/v) complex: synthesis, characterization, and solution behavior

A linear trinuclear mixed valence vanadium(v/iv/v) complex: synthesis, characterization, and solution behavior

Apigenin oxidovanadium(IV) cation interactions. Synthesis, spectral, bovine serum albumin binding, antioxidant and anticancer studies

New Insights into the Chemistry of Oxovanadium(IV) Complexes with N₄ Coordinating Ligands

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Composition and geometry of oxovanadium(IV) and (V)-aminoethanol–Schiff base complexes and stability of their peroxo complexes in solution

Cited by 22 publications

References 23 publications

A linear trinuclear mixed valence vanadium(v/iv/v) complex: synthesis, characterization, and solution behavior

A linear trinuclear mixed valence vanadium(v/iv/v) complex: synthesis, characterization, and solution behavior

Apigenin oxidovanadium(IV) cation interactions. Synthesis, spectral, bovine serum albumin binding, antioxidant and anticancer studies

New Insights into the Chemistry of Oxovanadium(IV) Complexes with N4 Coordinating Ligands

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New Insights into the Chemistry of Oxovanadium(IV) Complexes with N₄ Coordinating Ligands