Zhong Li, Chen Wen-Bin, Li Xiao-Hui, OuYang Zhi-Jian, Yang Meng, Zhang Yi-Quan, Gao Song, Dong Wen
Guangzhou Key Laboratory for Environmentally Functional Materials and Technology, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China.
Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, P. R. China.
Inorg Chem. 2020 Apr 6;59(7):4414-4423. doi: 10.1021/acs.inorgchem.9b03555. Epub 2020 Mar 19.
The unique electronic configurations of lanthanide(III) ions generate abundant electronic energy levels, resulting in the fantastic magnetic and optical multifunctional properties of lanthanide complexes. Here, 2-hydroxy-3-methoxybenzoic acid (HMBA) was used to construct four Dy(III) and Tb(III) complexes containing two isostructural dinuclear complexes of [Ln(HMBA)(MBA)(DMF)(HO)]·6HO [Ln = Dy (), Tb (); DMF = ,-dimethylformamide] and two other isostructural beltlike one-dimensional-chain complexes of [NH][Ln(HMBA)] [Ln = Dy (), Tb ()]. Fluorescence measurements reveal that HMBA can sensitize Dy(III) and Tb(III) characteristic luminescence. Furthermore, complex can emit white light under UV-light irradiation originating from a dichromatic mixture of a blue emission of HMBA and a dominating yellow emission of Dy ions. Magnetic susceptibility measurements show that two Dy(III) complexes are single-molecule magnets with anisotropy barriers of 90(2) and 31(5) cm for and , respectively. The magnet-luminescence-structure correlations as well as relaxation pathways are investigated by ab initio calculations and fluorescent spectrometry.
镧系（III）离子独特的电子构型产生了丰富的电子能级，从而赋予了镧系配合物优异的磁和光多功能特性。在此，利用2-羟基-3-甲氧基苯甲酸（HMBA）构建了四个镝（III）和铽（III）配合物，其中包括两个同构的双核配合物[Ln(HMBA)(MBA)(DMF)(HO)]·6HO [Ln = Dy (), Tb (); DMF = ,-二甲基甲酰胺]以及另外两个同构的带状一维链状配合物[NH][Ln(HMBA)] [Ln = Dy (), Tb ()]。荧光测量结果表明，HMBA能够敏化Dy(III)和Tb(III)的特征发光。此外，配合物 在紫外光照射下可发射白光，该白光源于HMBA的蓝色发射与Dy离子占主导的黄色发射的双色混合。磁化率测量显示，两个Dy(III)配合物均为单分子磁体，其各向异性势垒对于 和 分别为90(2)和31(5) cm。通过从头算和荧光光谱法研究了磁-发光-结构相关性以及弛豫途径。
