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M. Jupa, G. Kickelbick, U. Schubert:
"Methacrylate-Substituted Titanium-Yttrium Mixed-Metal Oxo Clusters";
European Journal of Inorganic Chemistry, 9 (2004), 1835 - 1839.

Upon reaction of titanium propoxide and yttrium 2-methoxyethoxide with a sevenfold excess of methacrylic acid, three different mixed-metal clusters were obtained, depending on the titanium to yttrium alkoxide ratio. Clusters of the type Ti₄Y₂(µ₃-O)₄(µ₂-methacrylate)₁₂(µ₁-methacrylate)₂L₂ (L = MeOCH₂CH₂OH or methacrylic acid), with two [TiO₆] octahedra condensed to a zigzag chain of two [YO₈] dodecahedra and two [TiO₆] octahedra, were formed when the Ti/Y ratio in the precursor mixture was >= 3.5. The structure of Ti₄Y₂O₄(OMc)₁₂(OCH₂CH₂OMe)₂(McOH)₂ obtained with a Ti/Y ratio of 2 in the precursor mixture, consists of a ring of four corner-sharing [TiO₆] octahedra to which two [YO₈] dodecahedra are condensed.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04969111