The interaction of terbium nitrate pentahydrate and 1,4-naphthalenedicarboxylic acid (H2ndc) in a solvent mixture under solvothermal conditions yields two new metal-organic frameworks: ((CH3)2NH2)2[Tb3(H2O)(HCOO)(ndc)5]∙3DMF (1) and [Tb4(DMF)(NMP)6(ndc)6] (2) (ndc2– is 1,4-naphthalenedicarboxylate, DMF is N,N-dimethylformamide, NMP is N-methyl-2-pyrrolidone). The crystal structures of compounds 1 and 2 are established by the single crystal X-ray diffraction analysis. Compound 1 is a negatively charged 3D framework in which dimethyl ammonium cations act as counterions. The remaining volume available for solvent molecules is filled with DMF. Compound 2 has a dense layered structure. The luminescence spectrum contains one emission band corresponding to π*– π transitions in the ligand.

中文翻译：

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基于铽和 1,4-萘二甲酸的金属有机框架的晶体结构

在溶剂热条件下，五水合硝酸铽和 1,4-萘二甲酸 (H2ndc) 在溶剂混合物中的相互作用产生两种新的金属有机骨架：((CH3)2NH2)2[Tb3(H2O)(HCOO)(ndc)5 ]∙3DMF (1) 和 [Tb4(DMF)(NMP)6(ndc)6] (2) (ndc2– 为 1,4-萘二甲酸酯，DMF 为 N,N-二甲基甲酰胺，NMP 为 N-甲基-2-吡咯烷酮）。化合物 1 和 2 的晶体结构由单晶 X 射线衍射分析确定。化合物 1 是一个带负电荷的 3D 框架，其中二甲基铵阳离子作为反离子。可用于溶剂分子的剩余体积填充有 DMF。化合物2具有致密的层状结构。发光光谱包含一个发射带，对应于配体中的 π*– π 跃迁。