Triangulo-{ErIII 3} complex showing field supported slow magnetic relaxation

Mamo Gebrezgiabher; Sören Schlittenhardt; Cyril Rajnák; Juraj Kuchár; Assefa Sergawie; Juraj Černák; Mario Ruben; Madhu Thomas; Roman Boča

doi:10.1039/d2ra04328a

Triangulo-{Er^III ₃} complex showing field supported slow magnetic relaxation

RSC Adv. 2022 Aug 4;12(33):21674-21680. doi: 10.1039/d2ra04328a. eCollection 2022 Jul 21.

Authors

Mamo Gebrezgiabher^{1

2}, Sören Schlittenhardt³, Cyril Rajnák², Juraj Kuchár⁴, Assefa Sergawie¹, Juraj Černák⁴, Mario Ruben^{3

5

6}, Madhu Thomas¹, Roman Boča²

Affiliations

¹ Department of Industrial Chemistry, College of Applied Sciences, Nanotechnology Excellence Center, Addis Ababa Science and Technology University Addis Ababa P.O. Box 16417 Ethiopia madhu.thomas@aastu.edu.et.
² Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius 91701 Trnava Slovakia roman.boca@ucm.sk.
³ Institute of Nanotechnology, Karlsruhe Institute of Technology Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany.
⁴ Department of Inorganic Chemistry, Institute of Chemistry, P. J. Šafárik University in Košice 041 80 Košice Slovakia.
⁵ Institute of Quantum Materials and Technologies (IQMT, ), Karlsruhe Institute of Technology Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany.
⁶ Centre Européen de Science Quantique (CESQ), Institut de Science et d'Ingénierie Supramoléculaires (ISIS, UMR 7006), CNRS-Université de Strasbourg 8 allée Gaspard Monge BP 70028 67083 Strasbourg Cedex France.

Abstract

The triangulo-{Er₃} complex [Er₃Cl(o-van)₃(OH)₂(H₂O)₅]Cl₃·nH₂O (n = 9.4; H(o-van) = o-vanillin) (1) was generated by an in situ method. The isolated Er(iii) complex 1 was characterized by elemental analysis and molecular spectroscopy. The results of single crystal X-ray diffraction studies have shown that 1 is built up of trinuclear [Er₃Cl(o-van)₃(OH)₂(H₂O)₅]³⁺ complex cations, chloride anions and water solvate molecules. Within the complex cation the three Er(iii) central atoms are placed at the apexes of a triangle which are bridged by three (o-van)^- ligands with additional chelating functions and two μ₃-OH^- ligands. Additionally five aqua and one chlorido ligands complete the octa-coordination of the three Er(iii) atoms. AC susceptibility measurements reveal that the compound exhibits slow magnetic relaxation with two relaxation modes.