Tris(acetylacetonato)titanium(III)

Tris(acetylacetonato)­titanium(III)
Names
IUPAC name
4-oxopent-2-en-2-olate;titanium(3+)
Other names
tris(2,4-pentanedionato)titanium, titanium trisacetylacetonate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.034.708 Edit this at Wikidata
EC Number
  • 238-196-7
  • InChI=1S/3C5H8O2.Ti/c3*1-4(6)3-5(2)7;/h3*3,6H,1-2H3;/q;;;+3/p-3
    Key: SYIKXNDVCPYCLG-UHFFFAOYSA-K
  • CC(=CC(=O)C)[O-].CC(=CC(=O)C)[O-].CC(=CC(=O)C)[O-].[Ti+3]
Properties
C15H21O6Ti
Molar mass 345.194 g·mol−1
Appearance blue solid
Density 1.366 g/cm3
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tris(acetylacetonato)titanium(III), often abbreviated Ti(acac)3, is a coordination complex of titanium(III) featuring acetylacetonate (acac) ligands, making it one of a family of metal acetylacetonates. It is a blue air-sensitive solid that dissolves in nonpolar organic solvents. The compound is prepared by treating titanium trichloride with acetylacetone in the presence of base.[1] Being paramagnetic, it gives a contact-shifted proton NMR signal at 60 ppm upfield of TMS assigned to the methyl group.[2]

Structure

It is an octahedral complex. The Ti-O bonds lengths range from 2.023 to 2.013 Å, the large variation being attributed to the Jahn-Teller effect. Ti(acac)3 possesses helical chirality, giving rise to Δ- and Λ-enantiomers.

It is a precatalyst for Ziegler-Natta catalysis.[3]

References

  1. ^ Arslan, Evrim; Lalancette, Roger A.; Bernal, Ivan (2017). "An Historic and Scientific Study of the Properties of Metal(III) Tris-acetylacetonates". Structural Chemistry. 28: 201–212. doi:10.1007/s11224-016-0864-0. S2CID 99668641.
  2. ^ Eaton, D. R. (1965). "The Nuclear Magnetic Resonance of Some Paramagnetic Transition Metal Acetylacetonates". Journal of the American Chemical Society. 87 (14): 3097–3102. doi:10.1021/ja01092a015.
  3. ^ Zambelli, Adolfo; Oliva, Leone; Pellecchia, Claudio (1989). "Soluble Catalysts for Syndiotactic Polymerization of Styrene". Macromolecules. 22 (5): 2129–2130. Bibcode:1989MaMol..22.2129Z. doi:10.1021/ma00195a021.

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