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S. Gross, G. Kickelbick, M. Puchberger, U. Schubert:
"Mono-, Di-, and Trimetallic Methacrylate-substituted Metal Oxide Clusters Derived from Hafnium Butoxide";
Monatshefte für Chemie, 134 (2003), 1053 - 1063.

The methacrylate-substituted clusters Hf₄O₂(OMc)₁₂, Hf₆O₄(OH)₄(OMc)₁₂(BuOH), Ti₄Hf₄O₆(OBu)₄(OMc)₁₆, and Ti₂Zr₅HfO₆(OMc)₂₀ (OMc=methacrylate) were prepared by reacting Hf(OBu)₄, or Hf(OBu)₄/Ti(OBu)₄ and Hf(OBu)₄/Zr(OBu)₄/Ti(OBu)₄ mixtures, respectively, with methacrylic acid. All clusters were characterized by X-ray structure analyses and are basically isostructural, although not in each case isomorphous, with the corresponding oxozirconium clusters. Low-temperature NMR studies revealed that the methacrylate ligands of Hf₄O₂(OMc)₁₂ are highly dynamic even at -80°C.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04405196