Weak DyIII-DyIII Interactions in DyIII-Phthalocyaninato Multiple-Decker Single-Molecule Magnets Effectively Suppress Magnetic Relaxation

Yoji Horii; Keiichi Katoh; Goulven Cosquer; Brian K Breedlove; Masahiro Yamashita

doi:10.1021/acs.inorgchem.6b01870

Weak Dy^III-Dy^III Interactions in Dy^III-Phthalocyaninato Multiple-Decker Single-Molecule Magnets Effectively Suppress Magnetic Relaxation

Inorg Chem. 2016 Nov 21;55(22):11782-11790. doi: 10.1021/acs.inorgchem.6b01870. Epub 2016 Nov 9.

Authors

Yoji Horii¹, Keiichi Katoh¹, Goulven Cosquer¹, Brian K Breedlove¹, Masahiro Yamashita^{1

2}

Affiliations

¹ Department of Chemistry, Graduate School of Science, Tohoku University , 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan.
² WPI Research Center, Advanced Institute for Materials Research, Tohoku University , 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan.

PMID: 27934317
DOI: 10.1021/acs.inorgchem.6b01870

Abstract

The Dy^III quintuple-decker complex DyCdCdDy and hetero quadruple-decker complex DyCdY were synthesized, and their magnetic properties were compared with those of the quadruple-decker complex DyCdDy. Single-crystal X-ray analysis revealed that the coordination geometries around the Dy^III ions of DyCdCdDy, DyCdY, and DyCdDy were similar. dc (direct current) magnetic measurements indicated that DyCdCdDy had very weak ferromagnetic Dy^III-Dy^III interactions but DyCdY did not. From a comparison of the magnetic relaxation times (τ) of the three complexes, the τ values of DyCdCdDy and DyCdDy, which have weak Dy^III-Dy^III interactions, are longer than that of DyCdY. In other words, weak Dy^III-Dy^III interactions effectively suppress magnetic relaxation.