The effect of fluorinated substituents on some solution properties of metal acetylacetonates

Watkins, Charles L.; Harris, Marvin E.

doi:10.1016/0022-1902(78)80222-x

Cited by 10 publications

(1 citation statement)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This value is not so far from that of [Al(acac) 3 ]. The electron densities of O atoms in [Al(hfa) 3 ] are slightly reduced by the electron withdrawing CF 3 groups as compared with those in [Al(acac) 3 ] in view of the molecular orbital calculations for the ligands . The geometrical arrangements of the six O atoms in [Al(acac) 3 ] and [Al(hfa) 3 ] were distorted from a regular octahedron, as shown in the crystal structures of the complexes .…”

Section: Resultsmentioning

confidence: 89%

Fluorination Effects on Rotational Correlation Times of Tris(β-diketonato)aluminum(III) in CO₂ by ²⁷Al NMR Relaxation Measurements

2011

View full text Add to dashboard Cite

(27)Al NMR longitudinal relaxation times, T(1,obs)((27)Al), of [Al(acac)(3)] and [Al(hfa)(3)] (Hacac = acetylacetone, Hhfa = hexafluoroacetylacetone) in CH(3)CN and CO(2) were measured over a wide range of temperature and pressure. The rotational correlation times, τ(r), of the tris(β-diketonato)aluminum(III) complexes were determined from T(1,obs)((27)Al) using (27)Al quadrupole coupling constants, eQq/h((27)Al), which were also obtained to be 3.11 and 3.22 MHz for [Al(acac)(3)] and [Al(hfa)(3)], respectively, in CD(3)CN by the dual spin probe technique in the present study. At each temperature, τ(r) increased almost linearly with increasing viscosity, η, in both CH(3)CN and CO(2); however, τ(r) in CO(2) at near critical densities deviated appreciably upward, as shown in a similar analogue of bis(acetylacetonato)beryllium(II), [Be(acac)(2)] (Umecky; et al. J. Phys. Chem. B 2002, 106, 11114). The η/T dependence of τ(r) was examined to discuss intermolecular interactions between the complexes and solvent molecules in terms of the fluorination and geometrical effects. The degree of solute-solvent interactions increases in the order [Be(acac)(2)] < [Al(hfa)(3)] < [Al(acac)(3)] in CH(3)CN and [Al(acac)(3)] < [Be(acac)(2)] < [Al(hfa)(3)] in CO(2). The results suggest that dipolar CH(3)CN molecules interact with negatively charged oxygen atoms in the complexes, whereas nonpolar CO(2) prefers fluorinated substituents as well as quasi-aromatic rings in the ligands. Moreover, the relationship between the rotational and translational motions of tris(acetylacetonato)metal(III), [M(III)(acac)(3)], in CO(2) was investigated.

show abstract

Section: Resultsmentioning

confidence: 89%

Fluorination Effects on Rotational Correlation Times of Tris(β-diketonato)aluminum(III) in CO₂ by ²⁷Al NMR Relaxation Measurements

2011

View full text Add to dashboard Cite

show abstract

A comparative 13C and 19F NMR study of some nickel, zinc and cobalt monothio-β-diketonate complexes

Haworth¹,

Maas²,

Das³

1981

Journal of Inorganic and Nuclear Chemistry

View full text Add to dashboard Cite

13C and 19F nuclear magnetic resonance studies on some monothio-β-diketonate complexes

Das

Haworth

1981

Journal of Inorganic and Nuclear Chemistry

View full text Add to dashboard Cite

The effect of fluorinated substituents on some solution properties of metal acetylacetonates

Cited by 10 publications

References 45 publications

Fluorination Effects on Rotational Correlation Times of Tris(β-diketonato)aluminum(III) in CO₂ by ²⁷Al NMR Relaxation Measurements

Fluorination Effects on Rotational Correlation Times of Tris(β-diketonato)aluminum(III) in CO₂ by ²⁷Al NMR Relaxation Measurements

A comparative 13C and 19F NMR study of some nickel, zinc and cobalt monothio-β-diketonate complexes

13C and 19F nuclear magnetic resonance studies on some monothio-β-diketonate complexes

Contact Info

Product

Resources

About

The effect of fluorinated substituents on some solution properties of metal acetylacetonates

Cited by 10 publications

References 45 publications

Fluorination Effects on Rotational Correlation Times of Tris(β-diketonato)aluminum(III) in CO2 by 27Al NMR Relaxation Measurements

Fluorination Effects on Rotational Correlation Times of Tris(β-diketonato)aluminum(III) in CO2 by 27Al NMR Relaxation Measurements

A comparative 13C and 19F NMR study of some nickel, zinc and cobalt monothio-β-diketonate complexes

13C and 19F nuclear magnetic resonance studies on some monothio-β-diketonate complexes

Contact Info

Product

Resources

About

Fluorination Effects on Rotational Correlation Times of Tris(β-diketonato)aluminum(III) in CO₂ by ²⁷Al NMR Relaxation Measurements

Fluorination Effects on Rotational Correlation Times of Tris(β-diketonato)aluminum(III) in CO₂ by ²⁷Al NMR Relaxation Measurements