Preparation and spectroscopic properties of oxovanadium(IV) and dioxomolybdenum(VI) complexes with tetraaza[14]annulenes containing pyridine rings

Sakata, Kazunori; Kuroda, Masako; Yanagida, Satoko; Hashimoto, Mamoru

doi:10.1016/s0020-1693(00)90375-x

Cited by 25 publications

(8 citation statements)

References 39 publications

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“…The Ultraviolet-Vis spectra of tetradentate tetraaza ligand and the dixomolybdenum(VI) complexes were recorded in ethanol and these spectral bands are measured according to reported energy level scheme 49,50 . The spectra of the dixomolybdenum(VI) complexes with tetradentate ligand are similar as one another thereby suggesting a standard structure for all.…”

Section: Uv-visible Spectramentioning

confidence: 99%

New Insights into the Chemistry of cis-Dioxomolybdenum(VI) Schiff Base Complexes with Macrocyclic Ligands

2019

Chem Sci Trans

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Preparation of one parent dioxomolybdenum(VI) complex of formula [MoO 2 (L)](acac) 2 with a Schiff base, obtained from condensation of thenil with 2,3-diamino-5-chloropyridine and four new complexes having formula [MoO 2 (ML)](acac) 2 , derived from cyclization of [MoO 2 (L)](acac) 2 with β-diketones are reported in this research paper. The prepared five dioxomolybdenum(VI) complexes have been described by elemental analyses, molar conductance, UV-Vis, IR, NMR and thermal studies. The feasibility of coordination number of molybdenum metal is six. All five complexes of dioxomolybdenum(VI) have octahedral geometry. The octahedral coordination circle of molybdenum in synthesized dioxomolybdenum complexes is completed by two oxo oxygen atoms and four nitrogen atoms from derived ligand. The shape of synthesized dioxomolybdenum(VI) complexes have distorted octahedral. All the synthesized complexes showed moderate activity against S. aureus and S. typhi, the improvement in the antibacterial activity being explained on the basis of chelation hypothesis.

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Section: Uv-visible Spectramentioning

confidence: 99%

New Insights into the Chemistry of cis-Dioxomolybdenum(VI) Schiff Base Complexes with Macrocyclic Ligands

2019

Chem Sci Trans

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“…The UV-Vis spectra of the tetradentate tetraaza ligand and the dixomolybdenum(VI) complexes had been recorded in ethanol and these spectral bands are consistent with suggested strength energy level scheme. 71,72 The spectra of the dixomolybdenum(VI) complexes with tetradentate ligand are comparable to each other thereby suggesting a common structure for all. In view of the fact that Mo(VI) ion has no d-electron, the absorption bands of pure d-d origins are not expected to appear.…”

Section: Resultsmentioning

confidence: 89%

SYNTHESIS AND STUDIES OF SOME cis- MoO2(VI) COMPLEXES WITH NITROGEN DONOR MACROCYCLIC LIGANDS

Gautam¹,

Singh²,

Saxena³

et al. 2019

ECB

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“…e macrocyclic complexes of oxovanadium(IV) exhibit >C=N absorption around 1625-1618 cm −1 , which normally appears at 1660 cm −1 in free ligands [15][16][17][18]. e lowering of this band in the complexes (type I) indicates the coordination of nitrogen atoms of the azomethine groups to the vanadium [19,20]. e presence of a band at around 302 cm −1 may be assigned to (V-N) vibration [21].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Oxovanadium(IV) Complexes with Tetraaza Coordinating Ligands

Singh

Yadav

Yadava

et al. 2012

Journal of Chemistry

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Oxovanadium(IV) complexes of the type [VO(mac)]SO4(where mac = tetraaza macrocyclic ligands derived by condensation of thenil with 1,4-diaminobenzene or 3,4-diaminopyridine and their reaction withβ-diketones) have been prepared using vanadyl ion as kinetic template. The prepared macrocyclic complexes were characterized by elemental analyses, molar conductance, magnetic moments, and infrared, electronic, and electron spin resonance data. From the spectroscopic studies, five-coordinate square-pyramidal geometry for the VO2+complexes have been proposed wherein derived ligands act as tetradentate chelating agents.

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Preparation and spectroscopic properties of oxovanadium(IV) and dioxomolybdenum(VI) complexes with tetraaza[14]annulenes containing pyridine rings

Cited by 25 publications

References 39 publications

New Insights into the Chemistry of cis-Dioxomolybdenum(VI) Schiff Base Complexes with Macrocyclic Ligands

New Insights into the Chemistry of cis-Dioxomolybdenum(VI) Schiff Base Complexes with Macrocyclic Ligands

SYNTHESIS AND STUDIES OF SOME cis- MoO2(VI) COMPLEXES WITH NITROGEN DONOR MACROCYCLIC LIGANDS

Synthesis of Oxovanadium(IV) Complexes with Tetraaza Coordinating Ligands

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