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CoII single-ion magnet and its multi-dimensional aggregations: Influence of the structural rigidity on magnetic relaxation process
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DOI：10.1016/j.cclet.2024.109600.png)
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Abstract
En 中文
Two Co-II -based complexes, {[Co(dps)(2)(N-3)(2) ] H2O}(n) ( 1 ) and [Co(dps)(2) (N-3)(2)]n ( 2 ), show a 1D chain and a 3D network, respectively. The central CoII ions in the complexes have the same coordination environment with the [Co(dps)(4)(N-3)(2) ] unit. Although the differences in crystal parameters are nearly negligible, their magnetic properties are very different. AC susceptibility data show that 1 behaves as a typical field-induced single-ion magnet (SIM) with the out-of-phase (chi(M)) signals, while 2 shows ac signals of chi(M) without peaks even under applied dc filed within our measurement window. Far-IR magneto-spectra (FIRMS) show strong spin-phonon couplings at 0 T in 2 , likely making the magnetic relaxation in 2 fast, while the couplings are negligible in 1. Small spin-phonon coupling in 1 likely leads to slower magnetic relaxation, making 1 a SIM. The difference in the properties is due to the structural rigidity of 2 in its 3D network, leading to stronger spin-phonon coupling. Combined high-field EPR (HF-EPR) and FIRMS studies give spin-Hamiltonian parameters, including D = 64.0(9) cm(-1) , | E | = 15.7(2) cm(-1) for 1 and D = 80.0(2) cm(-1) , | E | = 19.0(1) cm-1 for 2 . (c) 2024 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.
Keywords:
Spin-phonon coupling
Slow magnetic relaxation
Structural rigidity
Far-IR magneto-spectra
Co-II compounds
Journal
IF:
8.9
Papers:
1.2W
Citations:
3.8W
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