A series of acetylacetone-protected lanthanide–titanium–oxo clusters (LTOCs), formulated as [La₆Ti(μ₃-OH)₈(acac)₁₂(CH₃O)₂(CH₃OH)₆] (La₆Ti; Hacac = acetylacetone) and [Ln₉Ti₂(μ₄-O)(μ₃-OH)₁₄(acac)₁₇(CH₃O)₂(CH₃OH)₃] [Ln = Eu (Eu₉Ti₂) and Tb (Tb₉Ti₂)], were synthesized through the reactions of LnCl₃·6H₂O (Ln = La, Eu, and Tb), Hacac, Ti(OⁱPr)₄, and triethylamine in methanol. Crystal structural analysis shows that La₆Ti exhibits an hourglass-like structure consisting of two La₃Ti cubane subunits by sharing one Ti⁴⁺ ion, while Eu₉Ti₂ can be viewed as a combination of four Eu₃Ti cubane subunits by sharing three corners and one side. The photoluminescence (PL) measurements show that Tb₉Ti₂ exhibits excellent PL properties with a high quantum yield (QY) of 34.8%, while Eu₉Ti₂ only has a QY of 1.4% because of the different photosensitizations of ligands to Eu³⁺ and Tb³⁺ ions in the photophysical process.

中文翻译：

---

基于 β-二酮配体的镧系元素-钛-氧簇 Eu9Ti2 和 Tb9Ti2 的光致发光

一系列乙酰丙酮保护的镧系元素-钛-氧簇 (LTOCs)，表示为 [La ₆ Ti(μ ₃ -OH) ₈ (acac) ₁₂ (CH ₃ O) ₂ (CH ₃ OH) ₆ ] ( La ₆ Ti ; Hacac = 乙酰丙酮) 和 [Ln ₉ Ti ₂ (μ ₄ -O)(μ ₃ -OH) ₁₄ (acac) ₁₇ (CH ₃ O) ₂ (CH ₃ OH) ₃ ] [Ln = Eu ( Eu ₉ Ti ₂ ) 和 Tb ( Tb₉ Ti ₂ )]，通过 LnCl ₃ ·6H ₂ O (Ln = La、Eu 和 Tb)、Hacac、Ti(O ⁱ Pr) ₄和三乙胺在甲醇中的反应合成。晶体结构分析表明， La ₆ Ti呈沙漏状结构，由两个La ₃ Ti 立方烷亚基共用一个Ti ⁴⁺离子组成，而Eu ₉ Ti ₂可以看作是四个Eu ₃ Ti 立方三个角和一侧。光致发光 (PL) 测量表明Tb ₉ Ti ₂由于配体在光物理过程中对Eu ³⁺和Tb ³⁺离子的光敏化程度不同，表现出优异的PL性能，量子产率（QY）高达34.8%，而Eu ₉ Ti ₂的QY仅为1.4% 。