Two novel lanthanide-mercury compounds [Ln(IA)₃(H₂O)₂]_n(Hg₃Cl₉)_n·4nH₂O (Ln = Eu (1) and Tb (2); IA = isonicotinic acid) have been synthesized under solvothermal conditions and structurally characterized by single-crystal X-ray diffraction. Both complexes exhibit one-dimensional (1D) chain-like structure with a novel isolated (Hg₃Cl₉)^3– anion. Solid-state diffuse reflectance spectroscopy reveals the presence of wide optical band gaps of 2.81 eV and 3.47 eV, suggesting that they are potentially wide band gap organic semiconductor materials. Solid-state photoluminescence measurements uncover that they show red or green light emission bands, respectively. The emission bands can be assigned to the characteristic emission of the 4f electrons intrashell transitions of ⁵D₀ → ⁷F_J (Eu³⁺, J = 2 and 4) and ⁵D₄ → ⁷F_J (Tb³⁺, J = 6, 5, 4 and 3), respectively. Energy transfer mechanism is explained by the energy level diagram of Eu³⁺ ion, Tb³⁺ ion and isonicotinic acid ligand. The title compounds have remarkable CIE chromaticity coordinates of (0.6438, 0.3559) and (0.3172, 0.4773). This suggests that they may be potential candidates with red or green light emitting materials for white light emitting diodes (LEDs).

两种新型镧系元素汞化合物[Ln（IA）₃（H ₂ O）₂ ] _n（Hg ₃ Cl ₉）_n ·4 n H ₂ O（Ln = Eu（1）和Tb（2）； IA =异烟酸）是在溶剂热条件下合成的，并通过单晶X射线衍射对其结构进行表征。两种络合物均具有一维（1D）链状结构，并具有新颖的孤立（Hg ₃ Cl ₉）^3–负离子。固态漫反射光谱法揭示了2.81 eV和3.47 eV的宽光学带隙的存在，表明它们是潜在的宽带隙有机半导体材料。固态光致发光测量发现它们分别显示红色或绿色发光带。发射带可以分配给⁵ D ₀ → ⁷ F _J（Eu ³⁺，J = 2和4）和⁵ D ₄ → ⁷ F _J（Tb ³⁺，J）的4 f电子壳内跃迁的特征发射= 6、5、4和3）。通过Eu ³⁺离子，Tb ³⁺离子和异烟酸配体的能级图解释了能量转移的机理。标题化合物具有显着的CIE色度坐标（0.6438，0.3559）和（0.3172，0.4773）。这表明它们可能是用于白色发光二极管（LED）的红色或绿色发光材料的潜在候选材料。