While the versatile composition of layered double hydroxides (LDHs) allows the introduction of almost any polyvalent cation in their structure, the exchangeable negatively charged ions intercalated between the plates increase their vast range of functionalities. Here we report on the preparation and optical properties of pillared Eu³⁺-substituted ZnAl LDHs intercalated by aliphatic dicarboxylates: ^‒OOC‒(CH₂)_n–2‒COO^‒. The basal distance in these materials is dependent on the size and packing of the intercalated anions. By varying the number (n) of carbon atoms in the aliphatic chain from 2 to 12, the interlayer gallery of these ZnAlEu LDHs is considerably expanded from 0.9 to 2.1 nm. In the interlayer gallery, the aliphatic dicarboxylates form a monolayer, with the aliphatic chain inclined by an angle α ≈ 63° with the hydroxide layers. The carbon atom in the COO^– group is 0.43 nm far from the metal plane, showing that these carboxylates are not grafted in the brucite-like layers. These LDHs are thermally stable up to around 150 °C, after which dehydroxylation of the hydroxide layers is observed. The Judd-Ofelt intensity parameters were obtained and compared to the Eu³⁺-containing complexes with the same ligand series indicating a more symmetrical and less polarizable chemical environment around the rare earth ion.

虽然层状双氢氧化物 (LDH) 的多功能组合允许在其结构中引入几乎任何多价阳离子，但插在极板之间的可交换带负电离子增加了其广泛的功能。在这里，我们报告了由脂肪族二羧酸盐插层的柱状 Eu ³⁺取代的 ZnAl LDHs 的制备和光学性质：^‒ OOC‒(CH ₂ ) _{n -2} ‒COO ^‒。这些材料中的基础距离取决于插层阴离子的大小和堆积。通过改变数量（n) 脂肪链中的碳原子从 2 到 12，这些 ZnAlEu LDHs 的层间画廊从 0.9 到 2.1 nm 大大扩展。在层间通道中，脂肪族二羧酸盐形成单层，脂肪链与氢氧化物层倾斜α  ≈ 63°。^COO-组中的碳原子距离金属平面0.43 nm，表明这些羧酸盐没有接枝在类水镁石层中。这些 LDH 在高达 150 °C 左右的温度下是热稳定的，之后观察到氢氧化物层的脱羟基。获得 Judd-Ofelt 强度参数并与 Eu ^{3+进行比较}-含有具有相同配体系列的配合物，表明稀土离子周围的化学环境更对称且极化程度更低。