Synthesis, Crystal Structure, and Magnetization Dynamics of Phenoxy-Bridged Dy₂ Complexes with Different Counter Anions and Lattice Solvents

Abstract

Four phenoxy-bridged Dy 2 complexes [Dy 2 (L) 2 (H 2 O) 2 ](X) 2 • solvents [H 2 L = N,N′-bis(2-hydroxybenzyl)-N,N′-bis(2-methylpyridyl), X = Br, solvents = 2H 2 O (1), X = SCN, solvents = H 2 O (2), X = CF 3 SO 3 , solvents = 2EtOH (3), and X = BPh 4 , solvents = 2EtOH•MeCN ( 4)] with different counter anions and lattice solvents were obtained. X-ray crystallography showed that the {Dy 2 } cationic structures are similar in the four complexes and the one crystallographic independent Dy III ion has a coordination geometry close to square antiprism. Ac magnetic susceptibility measurements reveal that they all show slow magnetic relaxation behavior with subtle differences under a zero dc field. The crystal structure, their magnetization dynamics, and influence of different counter anions and lattice solvents have been analyzed combined with diamagnetic ion dilution experiments.

Alkyl Chains Modulated Magnetization Dynamics of Mononuclear Trigonal Prismatic CoII Complexes

“…However, recently, it has been noticed that small structural changes, such as different counter ions, lattice solvents, ligand substituents and some external stimuli can lead to significantly different SMM behaviors. [41][42][43][44][45][46][47][48][49][50][51] Hence, fine tuning the structures of SIMs and finding the affecting factors to the magnetic anisotropy, especially the magnetization dynamics can help deepen the understanding towards SMMs.…”