Solvent—Solute interaction. Solvation of vanadyl acetyl-acetonate in non-aqueous media

Urbanczyk, Andrzej; Kalinowski, Marek K.

doi:10.1007/bf00798641

Cited by 5 publications

(3 citation statements)

References 25 publications

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“…We found that the wavenumber of the lowest energy transition decreases with b, the solvent basicity. The correlations made from data reported by other authors in the literature 24,25,37 also show the same trend.…”

Section: Solvatochromism In Organic Solventssupporting

confidence: 81%

“…VO(acac) 2 has long been used as a solvatochromic probe. 17,24 It is stable, soluble in a wide range of organic solvents and its visible absorption spectrum (Vis) is strongly solvent dependent. The five coordinated square pyramidal VO(acac) 2 may become six coordinated, with the addition of a solvent molecule in the axial position.…”

Section: Solvatochromism In Organic Solventsmentioning

confidence: 99%

“…The five coordinated square pyramidal VO(acac) 2 may become six coordinated, with the addition of a solvent molecule in the axial position. [24][25][26][27] The d-d absorption spectra of vanadyl complexes are interpreted considering C 4V symmetry for the square pyramid, and three transitions are expected, considering the following energy levels:…”

Section: Solvatochromism In Organic Solventsmentioning

confidence: 99%

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Structural characterization and DFT study of VIVO(acac)2 in imidazolium ionic liquids

Mota¹,

Hallett

Kuznetsov³

et al. 2011

Phys. Chem. Chem. Phys.

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We report the structural characterization of vanadyl acetylacetonate in imidazolium room temperature ionic liquids--bbimNTf(2), bmimNTf(2), C(3)OmimNTf(2), bm(2)imNTf(2), bmimPF(6), bmimOTf, bmimBF(4), bmimMeCO(2), bmimMeSO(4), bmimMe(2)PO(4) and bmimN(CN)(2)--and organic solvents. The complex was characterized by visible electronic (Vis) and EPR spectroscopies. VO(acac)(2) shows solvatochromism in the selected ionic liquids and behaves as in organic solvents, evidencing coordination of the ionic liquid anion in the solvents with higher coordinating ability. The Lewis basicity order obtained for the IL anions was: PF(6)(-) < NTf(2)(-) < OTf(-)≈ MeCO(2)(-) < MeSO(4)(-) < BF(4)(-)≈ N(CN)(2)(-) < Me(2)PO(4)(-). The solvent effect on the spectroscopic data was tentatively examined using linear solvation energy relationships based on the Kamlet-Taft solvent scale (α, β and π*), however no suitable correlation was found with all data. The EPR characterization showed the presence of two isomers in bmimOTf, bmimMeCO(2) and bmimMe(2)PO(4), suggesting coordination of the ionic liquid anions in both equatorial and axial positions. The full geometry optimization of cis-/trans-VO(acac)(2)(OTf)(-) and cis-/trans-VO(acac)(2)(OTf)(mmim) structures was done at the B3P86/6-31G* level of theory. The calculations confirm that the anion OTf(-) is able to coordinate to VO(acac)(2) with the trans isomer being more stable than the cis by 4.8 kcal mol(-1).

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Section: Solvatochromism In Organic Solventssupporting

confidence: 81%

Section: Solvatochromism In Organic Solventsmentioning

confidence: 99%