Methacrylate‐Substituted Titanium‐Yttrium Mixed‐Metal Oxo Clusters

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 Ti 4 Y 2 (μ 3 ‐O) 4 (μ 2 ‐methacrylate) 12 (μ 1 ‐methacrylate) 2 L 2 (L = MeOCH 2 CH 2 OH or methacrylic acid), with two [TiO 6 ] octahedra condensed to a zigzag chain of two [YO 8 ] dodecahedra and two [TiO 6 ] octahedra, were formed when the Ti/Y ratio in the precursor mixture was ⩾ 3.5. The structure of Ti 4 Y 2 O 4 (OMc) 12 (OCH 2 CH 2 OMe) 2 (McOH) 2 obtained with a Ti/Y ratio of 2 in the precursor mixture, consists of a ring of four corner‐sharing [TiO 6 ] octahedra to which two [YO 8 ] dodecahedra are condensed. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)