Spectroscopic and magnetic studies of erbium(III)-TEMPO complex as a potential single-molecule magnet: Interplay of the crystal-field and exchange coupling effects

被引：15
|
作者：
Karbowiak, Miroslaw [1 ]
Rudowicz, Czeslaw [2 ,3 ]
Nakamura, Takeshi [4 ]
Murakami, Rina [4 ]
Ishida, Takayuki [4 ]
机构：
[1] Univ Wroclaw, Fac Chem, Ul F Joliot Curie 14, PL-50383 Wroclaw, Poland
[2] Adam Mickiewicz Univ, Fac Chem, Umultowska 89B, PL-61614 Poznan, Poland
[3] West Pomeranian Univ Technol Szczecin, Inst Phys, Modeling Spect Grp, Al Piastow 17, PL-70310 Szczecin, Poland
[4] Univ Electrocommun, Dept Engn Sci, Tokyo 1828585, Japan
来源：
CHEMICAL PHYSICS LETTERS | 2016年 / 662卷
关键词：
Single-molecule magnets; Spectroscopic properties; Magnetic susceptibility; Absorption spectra; Crystal-field parameters; Exchange coupling constants; Ln-TEMPO complexes; ENERGY-LEVELS; COORDINATION-COMPOUNDS; ION MAGNET; LANTHANIDE; LIGAND; GADOLINIUM(III); TERBIUM(III); LUMINESCENCE; HAMILTONIANS; PARAMETERS;
D O I：
10.1016/j.cplett.2016.09.033
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Crystallographic, spectroscopic, and magnetic studies of three-center systems: lanthanoid-Ln(3+) ions doubly-coordinated by TEMPO (2,2,6,6-tetramethylpiperidin-1-oxyl) radicals [Ln-TEMPO2] are reported. The temperature dependence of alternating-current magnetic susceptibility indicates the single-molecule-magnet behavior of Er-TEMPO2, exhibiting relatively slow magnetization relaxation. Well-resolved absorption spectra were obtained only for Er-TEMPO2. Other samples yielded spectra not amenable for meaningful interpretation. The crystal-field parameters (CFPs) determined from the measured Er3+-energy levels served as starting CFPs for fitting the direct-current magnetic susceptibility result. Compatibility of the so-determined and fine-tuned CFPs, and interplay between crystal-field related effects and exchange-coupling effects are considered. Exchange couplings in Ln-TEMPO2 appear antiferromagnetic and unexpectedly large. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：163 / 168
页数：6
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