Tuning of Hula-Hoop Coordination Geometry in a Dy Dimer

Inorganics

Yan Peng²  Valeriu Mereacre²  Christopher E. Anson²  Annie K. Powell²  Stephen Mansell¹ 

[1] Institute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstrasse 15, 76131 Karlsruhe, GermanyInstitute of Inorganic Chemistry, Karlsruhe Institute of Technology, Engesserstrasse 15, 76131 Karlsruhe, Germany;

关键词: hydrazone Schiff base;    Dy dimer;    hula-hoop;    single molecule magnets;   

DOI  :  10.3390/inorganics4010002

来源: mdpi

【 摘 要 】

The reaction of DyCl₃ with hydrazone Schiff base ligands and sodium acetate in the presence of triethylamine (Et₃N) as base affords two dysprosium dimers: [Dy₂(HL1)₂(OAc)₂(EtOH)(MeOH)] (1) and [Dy₂(L2)₂(OAc)₂(H₂O)₂]·2MeOH (2). The Dy^III ions in complexes 1 and 2 are linked by alkoxo bridges, and display “hula hoop” coordination geometries. Consequently, these two compounds show distinct magnetic properties. Complex 1 behaves as a field-induced single molecule magnet (SMM), while typical SMM behavior was observed for complex 2. In addition, comparison of the structural parameters among similar Dy₂ SMMs with hula hoop-like geometry reveals the significant role played by coordination geometry and magnetic interaction in modulating the relaxation dynamics of SMMs.

【 授权许可】

CC BY   
© 2016 by the authors; licensee MDPI, Basel, Switzerland.