Tris(acetylacetonato)titanium(III), often abbreviated Ti(acac)
3, is a
coordination complex
A coordination complex consists of a central atom or ion, which is usually metallic and is called the ''coordination centre'', and a surrounding array of bound molecules or ions, that are in turn known as '' ligands'' or complexing agents. ...
of titanium(III) featuring
acetylacetonate
Acetylacetone is an organic compound with the chemical formula . It is a colorless liquid, classified as a 1,3-diketone. It exists in equilibrium with a tautomer . These tautomers interconvert so rapidly under most conditions that they are tr ...
(acac)
ligand
In coordination chemistry, a ligand is an ion or molecule ( functional group) that binds to a central metal atom to form a coordination complex. The bonding with the metal generally involves formal donation of one or more of the ligand's elec ...
s, 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
Titanium(III) chloride is the inorganic compound with the formula TiCl3. At least four distinct species have this formula; additionally hydrated derivatives are known. TiCl3 is one of the most common halides of titanium and is an important cataly ...
with
acetylacetone in the presence of base. Being paramagnetic, it gives a
contact-shifted
proton NMR
Proton nuclear magnetic resonance (proton NMR, hydrogen-1 NMR, or 1H NMR) is the application of nuclear magnetic resonance in NMR spectroscopy with respect to hydrogen-1 nuclei within the molecules of a substance, in order to determine the struct ...
signal at 60 ppm upfield of TMS assigned to the methyl group.
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
Helical may refer to:
* Helix, the mathematical concept for the shape
* Helical engine, a proposed spacecraft propulsion drive
* Helical spring, a coilspring
* Helical plc, a British property company, once a maker of steel bar stock
* Helicoil
A t ...
, giving rise to Δ- and Λ-
enantiomers.
It is a precatalyst for
Ziegler-Natta catalysis.
References
{{Acetylacetonate complexes
Acetylacetonate complexes