Tetranuclear Dysprosium(III) Quintuple-Decker Single-Molecule Magnet Prepared Using a π-Extended Phthalocyaninato Ligand with Two Coordination Sites

Keiichi Katoh; Takaumi Morita; Nobuhiro Yasuda; Wolfgang Wernsdorfer; Yasutaka Kitagawa; Brian K Breedlove; Masahiro Yamashita

doi:10.1002/chem.201804100

Tetranuclear Dysprosium(III) Quintuple-Decker Single-Molecule Magnet Prepared Using a π-Extended Phthalocyaninato Ligand with Two Coordination Sites

Chemistry. 2018 Oct 17;24(58):15522-15528. doi: 10.1002/chem.201804100. Epub 2018 Sep 19.

Authors

Keiichi Katoh¹, Takaumi Morita¹, Nobuhiro Yasuda², Wolfgang Wernsdorfer^{3

4

5}, Yasutaka Kitagawa⁶, Brian K Breedlove¹, Masahiro Yamashita^{1

7

8}

Affiliations

¹ Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8578, Japan.
² Research and Utilization Division, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan.
³ CNRS, Institut Néel, 38042, Grenoble, France.
⁴ KIT, Physikalisches Institut, Wolfgang-Gaede-Str. 1, 76131, Karlsruhe, Germany.
⁵ KIT, Institute of Nanotechnology, 76344, Eggenstein-Leopoldshafen, Germany.
⁶ Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Machikaneyama, Toyonaka, Osaka, 560-8531, Japan.
⁷ WPI Research Center, Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
⁸ School of Materials Science and Engineering, Nankai University, Tianjin, 300350, P. R. China.

PMID: 30182501
DOI: 10.1002/chem.201804100

Abstract

The magnetic properties and spin relaxation processes of a tetranuclear dysprosium(III) fused phthalocyaninato (Pc^4- ) quintuple-decker single-molecule magnet (SMM) (1) with non-equivalent octa-coordination geometries are reported. The structure of 1 is regarded as a dimer of Dy³⁺ -Pc triple-decker SMMs with different magnetic relaxation characteristics, corresponding to the octa-coordination geometry sites Dy1 with C₄ symmetry (ϕ₁ =23°) and Dy2 with D_4d symmetry (ϕ₂ =45°). In an H_dc of 1750 Oe and T range of 1.8-3.75 K, the quantum tunnelling of the magnetization was suppressed, and the direct process was enhanced. The effects of the coordination geometry on the spin relaxation phenomena are examined.

Keywords: coordination geometry; dysprosium; quintuple-decker complex; single-molecule magnet; spin relaxation phenomenon.

Abstract

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