Institute of Materials Chemistry, Vienna University of Technology, 1060 Wien (Austria).
Chemistry. 2014 Jan 7;20(2):493-8. doi: 10.1002/chem.201302892. Epub 2013 Dec 4.
Mixed-metal clusters have been obtained from the reaction of titanium alkoxides with either strontium or lead acetate and methacrylic acid. The structures of the clusters are derived from the metallacycle Ti8 O8 (methacrylate)16 . The Sr and Pb atoms in Sr2 Ti8 O8 X2 (OOCMe)2 (methacrylate)16 (X: acetate or OiPr) and Pb2 Ti8 O8 (OBu)2 X2 (methacrylate)16 (BuOH)2 (X: acetate or methacrylate) occupy the central cavity of the Ti8 O8 ring. In addition to the crown-ether-like coordination of the ring oxygen atoms to the Sr or Pb atoms, bridging carboxylate ligands support the coordination of the latter atoms. In the compound Pb2 Ti6 O5 (OiPr)3 X(methacrylate)14 (X: OiPr or methacrylate), the lead atoms are coordinated by a fragment of the Ti8 O8 (methacrylate)16 metallacycle.
混合金属簇已通过钛醇盐与锶或乙酸铅和甲基丙烯酸的反应得到。这些簇的结构来源于金属环 Ti8 O8（甲基丙烯酸酯）16。Sr2 Ti8 O8 X2（OOCMe）2（甲基丙烯酸酯）16（X：乙酸盐或OiPr）和 Pb2 Ti8 O8（OBu）2 X2（甲基丙烯酸酯）16（BuOH）2（X：乙酸盐或甲基丙烯酸酯）中的 Sr 和 Pb 原子占据 Ti8 O8 环的中心腔。除了环氧原子对 Sr 或 Pb 原子的冠醚样配位外，桥连羧酸盐配体还支持后者原子的配位。在化合物 Pb2 Ti6 O5（OiPr）3 X（甲基丙烯酸酯）14（X：OiPr 或甲基丙烯酸酯）中，Pb 原子由 Ti8 O8（甲基丙烯酸酯）16 金属环的片段配位。
