This paper presents the synthesis of a tripodal ligand (H₃L) via the Schiff base condensation of N,N-diethylsalicylaldehyde and tris(2-aminoethyl)amine. The neutral complexes of type [EuL], [GdL] and [DyL] were synthesized and characterized by FT-IR, SEM-EDS, PXRD, single crystal X-ray diffraction, CHN analysis and high resolution ESI-MS. X-ray crystallographic studies demonstrated that the heptadentate ligand incorporating a cavity pre-organized by hydrogen bonding binds the Ln(III) ions to yield a face capped octahedral coordination geometry with three-fold symmetry. Photoluminescence studies show a typical Ln(III) absorption character for the three complexes, with [EuL] demonstrating considerably stronger lanthanide-based luminescence peaks, and a Eu(III) centered luminescence lifetime of 0.144 ± 0.01 ms. Temperature/field-dependent DC and temperature/frequency-dependent AC magnetic measurements carried out for the Dy(III) complex indicated obvious magnetic anisotropy and suggested slow relaxation behaviour with considerable quantum tunnelling of the magnetization contribution.

中文翻译：

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新的三脚架镧系元素配合物的合成，表征及其光学和磁性

本文介绍了通过N，N-二乙基水杨醛醛和三（2-氨基乙基）胺的席夫碱缩合反应合成三脚架配体（H ₃ L）。合成了[EuL]，[GdL]和[DyL]型中性配合物，并通过FT-IR，SEM-EDS，PXRD，单晶X射线衍射，CHN分析和高分辨率ESI-MS对其进行了表征。X射线晶体学研究表明，结合有通过氢键预先组织的空腔的七齿配体与Ln（III）离子结合，产生具有三重对称性的面封八面体配位几何。光致发光研究表明典型的Ln（III）对三种配合物的吸收特性，[EuL]表现出明显更强的基于镧系元素的发光峰，并且以Eu（III）为中心的发光寿命为0.144±0.01 ms。对Dy（III）配合物进行的温度/场相关的DC和温度/频率相关的AC磁测量表明，磁各向异性很明显，并显示出缓慢的弛豫行为，并具有相当大的量子隧穿磁化贡献。