Synthesis, Structure and Luminescence Characterizations of Pyramid-like Lanthanide-Titanium-Oxo Clusters EuTi9 and TbTi9

[Display omitted] •Two lanthanide − titanium oxo clusters EuTi9 and TbTi9 protected by four kinds of ligands were prepared.•The EuTi9 and TbTi9 cluster core containing ten metal ions shows pyramid-like structure.•EuTi9 and TbTi9 display the temperature-dependent luminescence properties. Two pyramid-like lanthanide − titanium − oxo clusters formulated as LnTi9(µ2-O)5(µ3-O)7(µ3-OH)2(OiPr)(acac)2(TCA)10(THF) (LnTi9, Ln = Eu / Tb, HTCA = 2-thiophenecarboxylic acid) were prepared through the reaction of Ln(acac)3, 2-thiophenecarboxylic acid (HTCA), Ti(OiPr)4 and THF. The 10-nuclearity-metal-core [LnTi9(µ2-O)5(µ3-O)7(µ3-OH)2]13+ is protected by four kinds of ligands. EuTi9 and TbTi9 exhibit characteristic emissions of Eu3+ / Tb3+ under ultraviolet excitation. The temperature-dependent luminescence results show EuTi9 shows a good linear relationship between the luminescence intensity and temperature range of 80–320 K, while TbTi9 has high temperature-sensitivity in different temperature ranges.