Field-Induced Slow Magnetic Relaxation of GdIII Complex with a Pt-Gd Heterometallic Bond

Takefumi Yoshida; Goulven Cosquer; David Chukwuma Izuogu; Hiroyoshi Ohtsu; Masaki Kawano; Yanhua Lan; Wolfgang Wernsdorfer; Hiroyuki Nojiri; Brian K Breedlove; Masahiro Yamashita

doi:10.1002/chem.201700886

Field-Induced Slow Magnetic Relaxation of Gd^III Complex with a Pt-Gd Heterometallic Bond

Chemistry. 2017 Apr 3;23(19):4551-4556. doi: 10.1002/chem.201700886. Epub 2017 Mar 20.

Authors

Takefumi Yoshida^{1

2}, Goulven Cosquer^{1

2}, David Chukwuma Izuogu^{1

2}, Hiroyoshi Ohtsu³, Masaki Kawano³, Yanhua Lan⁴, Wolfgang Wernsdorfer⁴, Hiroyuki Nojiri⁵, Brian K Breedlove^{1

2}, Masahiro Yamashita^{1

2}

Affiliations

¹ Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aza-aoba, Aramaki, Sendai, 980-8578, Japan.
² WPI-Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai, 980-8577, Japan.
³ Department of Chemistry, Graduate School of Science, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo, 152-8551, Japan.
⁴ Laboratory Louis Nèel, CNRS, BP 166, 38042, Grenoble Cedex 9, France.
⁵ Institute for Materials Research, Tohoku University, Sendai, Miyagi, 980-8577, Japan.

PMID: 28248439
DOI: 10.1002/chem.201700886

Abstract

Heterometallic Gd-Pt complexes ([Gd₂ Pt₃ (H₂ O)₂ (SAc)₁₂ ] (SAc=thioacetate), [Y_1.4 Gd_0.6 Pt₃ (H₂ O)₂ (SAc)₁₂ ], and [Gd₂ Pt₃ (H₂ O)₆ (SAc)₁₂ ]⋅7 H₂ O have been synthesized. The crystal structures and DFT calculations indicated a Gd-Pt heretometallic bond. Single-crystal ESR spectra determined the direction of magnetic anisotropy as direction of the Gd-Pt bond. In other words, the Gd-Pt bond dictates the direction of magnetic anisotropy. The heterometallic Gd-Pt bond lowers the symmetry of the Gd ion, splitting the Kramers doublet in a dc field. Thus, we observed clear field-induced slow magnetic relaxation of [Y_1.4 Gd_0.6 Pt₃ (H₂ O)₂ (SAc)₁₂ ] up to 36 K. The relaxation process was determined to be a direct process.

Keywords: gadolinium; heterometallic bond; magnetic properties; slow magnetic relaxation; thioacetate.