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Strong Exchange Couplings Drastically Slow Down Magnetization Relaxation in an Air‐Stable Cobalt(II)‐Radical Single‐Molecule Magnet (SMM)
Author(s) -
Albold Uta,
Bamberger Heiko,
Hallmen Philipp P.,
van Slageren Joris,
Sarkar Biprajit
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201904645
Subject(s) - cobalt , magnetization , magnet , relaxation (psychology) , single molecule magnet , condensed matter physics , molecular magnets , materials science , molecule , nuclear magnetic resonance , chemical physics , chemistry , physics , magnetic field , inorganic chemistry , quantum mechanics , medicine , organic chemistry
The energy barrier leading to magnetic bistability in molecular clusters is determined by the magnetic anisotropy of the cluster constituents. By incorporating a highly anisotropic four‐coordinate cobalt(II) building block into a strongly coupled fully air‐ and moisture‐stable three‐spin system, it proved possible to suppress under‐barrier Raman processes leading to 350‐fold increase of magnetization relaxation time and pronounced hysteresis. Relaxation times of up to 9 hours at low temperatures were found.