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Triimidosulfonates as Acute Bite‐Angle Chelates: Slow Relaxation of the Magnetization in Zero Field and Hysteresis Loop of a Co II Complex
Author(s) -
Carl Elena,
Demeshko Serhiy,
Meyer Franc,
Stalke Dietmar
Publication year - 2015
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.201406083
Subject(s) - hysteresis , zero (linguistics) , magnetization , relaxation (psychology) , loop (graph theory) , condensed matter physics , magnetic hysteresis , nuclear magnetic resonance , physics , field (mathematics) , materials science , magnetic field , mathematics , quantum mechanics , psychology , combinatorics , pure mathematics , neuroscience , philosophy , linguistics
Starting from a polyimido sulfonate the four‐coordinate, N , N′ ‐chelated Co II complex [Co{(N t Bu) 3 SMe} 2 ] ( 1 ) was synthesized, and its molecular structure was elucidated by single‐crystal X‐ray structural analysis. The acute N‐Co‐N bite angle imposed by the N , N′ ‐chelating ligand (N t Bu) 3 SMe − leads to pronounced C 2 v distortion of the tetrahedral coordination environment and thus to high anisotropy of the Co II ion ( D ≈−58 cm −1 ), favorable for single‐molecule‐magnet (SMM) properties. Magnetic measurements revealed a high barrier to spin reversal ( U eff =75 cm −1 ) that gives rise to the observation of slow relaxation of the magnetization in zero field and a hysteresis loop at 2 K for this unique complex.