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Elucidation of Dual Magnetic Relaxation Processes in Dinuclear Dysprosium(III) Phthalocyaninato Triple‐Decker Single‐Molecule Magnets Depending on the Octacoordination Geometry
Author(s) -
Katoh Keiichi,
Aizawa Yu,
Morita Takaumi,
Breedlove Brian K.,
Yamashita Masahiro
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201703014
Subject(s) - dysprosium , zeeman effect , magnetization , chemistry , coordination geometry , single molecule magnet , ground state , magnet , geometry , condensed matter physics , magnetic field , lanthanide , crystallography , relaxation (psychology) , molecule , physics , atomic physics , ion , inorganic chemistry , quantum mechanics , social psychology , hydrogen bond , psychology , mathematics , organic chemistry
When applying single‐molecule magnets (SMMs) to spintronic devices, control of the quantum tunneling of the magnetization (QTM) as well as a spin‐lattice interactions are important. Attempts have been made to use not only coordination geometry but also magnetic interactions between SMMs as an exchange bias. In this manuscript, dinuclear dysprosium(III) (Dy III ) SMMs with the same octacoordination geometry undergo dual magnetic relaxation processes at low temperature. In the dinuclear Dy III phthalocyaninato (Pc 2− ) triple‐decker type complex [(Pc)Dy(ooPc)Dy(Pc)] ( 1 ) (ooPc 2− =2,3,9,10,16,17,23,24‐octakis(octyloxy)phthalocyaninato) with a square‐antiprismatic (SAP) geometry, the ground state is divided by the Zeeman effect, and level intersection occurs when a magnetic field is applied. Due to the ground state properties of 1 , since the Zeeman diagram where the levels intersect in an H dc of 2500 Oe, two kinds of QTM and direct processes occur. However, dinuclear Dy III ‐Pc systems with C 4 geometry, which have a twist angle ( ϕ ) of less than 45° do not undergo dual magnetic relaxation processes. From magnetic field and temperature dependences, the dual magnetic relaxation processes were clarified.