Hafnium acetylacetonate[1]
Names
IUPAC name
hafnium(4+); (Z)-4-oxopent-2-en-2-olate
Other names
tetrakis(acetylacetonato)hafnium, hafnium tetrakis(acetylacetonate)
Identifiers
3D model (JSmol)
  • InChI=1S/4C5H8O2.Hf/c4*1-4(6)3-5(2)7;/h4*3,6H,1-2H3;/q;;;;+4/p-4/b4*4-3-;
    Key: MCFIMQJAFAOJPD-MTOQALJVSA-J
  • [Hf+4].O=C(C)\C=C(/[O-])C.[O-]\C(C)=C/C(C)=O.[O-]\C(C)=C/C(C)=O.[O-]\C(C)=C/C(C)=O
Properties
C20H28HfO8
Molar mass 574.93 g·mol−1
Appearance White to off-white powder
Density 1.42 g/cm3
Melting point 193 °C (379 °F; 466 K) (decomposes)
Solubility in benzene good
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Hafnium acetylacetonate, also known as Hf(acac)4, is a coordination compound with formula Hf(C5H7O2)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 is D2, 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.[2]

Uses

Along with titanium tetrabutoxide (TBT), hafnium acetylacetonate serves as a catalyst for the production of poly(butylene terephthalate).[3]

Related compounds

References

  1. ^ "Hafnium Acetylacetonate". American Elements. Retrieved 2015-04-05.
  2. ^ Zherikova, K. V.; Morozova, N. B.; Kuratieva, N. V.; Baidina, I. A.; Igumenov, I. K. (November 2005). "Synthesis and structural investigation of hafnium(IV) complexes with acetylacetone and trifluoroacetylacetone". Journal of Structural Chemistry. 46 (6): 1039–1046. doi:10.1007/s10947-006-0239-2. S2CID 95300586.
  3. ^ Banach, T.E; Berti, C; Colonna, M; Fiorini, M; Marianucci, E; Messori, M; Pilati, F; Toselli, M (August 2001). "New catalysts for poly(butylene terephthalate) synthesis". Polymer. 42 (18): 7511–7516. doi:10.1016/S0032-3861(01)00219-1.
  4. ^ Morris, Melvin L.; Moshier, Ross W.; Sievers, Robert E. (1967). "Tetrakis(1,1,1‐trifluoro‐2,4‐pentanedionato)zirconium(and Hafnium)". Tetrakis(1,1,1-trifluoro-2,4-pentanedionato)zirconium (and Hafnium). Inorganic Syntheses. Vol. 9. pp. 50–52. doi:10.1002/9780470132401.ch15. ISBN 9780470131688.
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