Hafnium acetylacetonate, also known as Hf(acac)
4, is a
coordination compound
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. Many ...
with formula Hf(C
5H
7O
2)
4. This white solid is the main
hafnium complex of
acetylacetonate. The complex has a square
antiprismatic geometry with eight nearly equivalent Hf-O bonds. The molecular
symmetry
Symmetry (from grc, συμμετρία "agreement in dimensions, due proportion, arrangement") in everyday language refers to a sense of harmonious and beautiful proportion and balance. In mathematics, "symmetry" has a more precise definit ...
is ''D''
2, i.e., the complex is chiral. It is prepared from hafnium tetrachloride and acetylacetone, and base.
Zr(acac)4 is very similar in structure and properties.
Uses
Along with titanium tetrabutoxide (TBT), hafnium acetylacetonate serves as a
catalyst for the production of poly(butylene terephthalate).
Related compounds
*Tetrakis(1,1,1-trifluoro-2,4-pentanedionato)hafnium
References
{{organic-compound-stub
Hafnium compounds
Acetylacetonate complexes