Abstract

Two isostructural mononuclear complexes of lanthanides (Ln = La and Pr) constructed from 1,8-naphthalene dicarboxylate (NDC) and 1,10-phenanthroline (Phen) as auxiliary ligand are reported. Both the complexes were formed through an in situ hydrolytic ring opening reaction of 1,8-naphthalic anhydride with Phen ligands. 3D supramolecular structures are observed which are guided by different weak interactions. The crystal structures of both the complexes were determined by single crystal X-ray diffraction. The room temperature photoluminescence studies, carried out in the powder state displayed three noticeable peaks from excited (³P_J; J = 2, 1, and 0) to ground state (³H₄) at ~464 nm, 497 nm, and 538 nm, respectively, under UV excitation. Temperature dependent dc susceptibility (χ = M/H) as a function of temperature is investigated where Pr-complex shows antiferromagnetic behaviour. The Hirshfeld surface analysis of the two complexes is also described.

中文翻译：

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1,8-萘二甲酸两种镧系配合物的合成、超分子洞察、赫什菲尔德表面分析和磁性

摘要

报道了由 1,8-萘二甲酸 (NDC) 和 1,10-菲咯啉 (Phen) 作为辅助配体构建的两种同构单核配合物（Ln = La 和 Pr）。这两种配合物都是通过 1,8-萘二甲酸酐与 Phen 配体的原位水解开环反应形成的。观察到由不同弱相互作用引导的 3D 超分子结构。两种配合物的晶体结构均通过单晶X射线衍射测定。在粉末状态下进行的室温光致发光研究显示了从激发态 ( ³ P _J ; J  = 2、1 和 0) 到基态 ( ³ H ₄ ) 的三个明显峰，分别位于 ~464 nm、497 nm 和 538 nm nm，分别在紫外激发下。研究了随温度变化的直流磁化率 (χ =  M / H ) 作为温度的函数，其中 Pr 络合物表现出反铁磁行为。还描述了两种配合物的赫什菲尔德表面分析。