Modulating Slow Magnetic Relaxation of Dysprosium Compounds through the Position of Coordinating Nitrate Group

Fang Ma; Qi Chen; Jin Xiong; Hao-Ling Sun; Yi-Quan Zhang; Song Gao

doi:10.1021/acs.inorgchem.7b02162

Modulating Slow Magnetic Relaxation of Dysprosium Compounds through the Position of Coordinating Nitrate Group

Inorg Chem. 2017 Nov 6;56(21):13430-13436. doi: 10.1021/acs.inorgchem.7b02162.

Authors

Fang Ma¹, Qi Chen¹, Jin Xiong², Hao-Ling Sun¹, Yi-Quan Zhang³, Song Gao²

Affiliations

¹ Department of Chemistry and Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing Normal University , Beijing 100875, P. R. China.
² College of Chemistry and Molecular Engineering, State Key Laboratory of Rare Earth Materials Chemistry and Applications, Beijing National Laboratory for Molecular Sciences, Peking University , Beijing 100871, P. R. China.
³ Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University , Nanjing 210023, P. R. China.

PMID: 29068200
DOI: 10.1021/acs.inorgchem.7b02162

Abstract

A chain complex [Dy(L)(NO₃)₂CH₃OH]_n (1) and a dinuclear compound [Dy₂(L)₂(NO₃)₄(CH₃OH)₂]·2CH₃OH (2) were synthesized by the assembly of a novel pyridine-N-oxide-containing ligand with dysprosium nitrate under different reaction temperatures, where two coordinating nitrates are located in para or ortho position with respect to each other around dysprosium ions. Magnetic studies indicate that the chain complex with two para-coordinating nitrates shows fast quantum tunnelling of the magnetization under zero direct-current field, while the dinuclear complex with two ortho-coordinating nitrates exhibits a thermal-activated process with an effective energy barrier of 51 K. Theoretical and magneto-structural correlation studies indicate that position change of coordinating nitrates can significantly modulate the crystal field around dysprosium ion and further lead to their different relaxation behaviors.