Hafnium acetylacetonate
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]
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| Names | |
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| IUPAC name
hafnium(4+); (Z)-4-oxopent-2-en-2-olate | |
| Other names
tetrakis(acetylacetonato)hafnium, hafnium tetrakis(acetylacetonate) | |
| Identifiers | |
3D model (JSmol) |
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PubChem CID |
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| 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). | |
| Infobox references | |
Uses
Along with titanium tetrabutoxide (TBT), hafnium acetylacetonate serves as a catalyst for the production of poly(butylene terephthalate).[3]
References
- "Hafnium Acetylacetonate". American Elements. Retrieved 2015-04-05.
- 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.
- 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.
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