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Self-assembly of fish-bone and grid-like Co-based single-molecule magnets using dihydrazone ligands with NNN and NNO pockets

Dalton Transactions, ISSN: 1477-9234, Vol: 51, Issue: 36, Page: 13928-13937
2022
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Article Description

Three Co complexes, [Co(HL)](ClO)·4CHOH (1), [Co(HL)](ClO) (2) and [Co(HL)](ClO) (3), were constructed by the self-assembly of the symmetrical dihydrazone ligands H2L1 and H4L2 with Co ions under different synthetic conditions. The fish-bone-like complex 1 was obtained using the ligand H2L1 in methanol via the solvothermal method, while the self-assembly of H4L2 with Co ions is solvent-dependent, producing the fish-bone-like complex 2 and [2 × 2] grid-like complex 3. Magnetic susceptibility measurements and theoretical calculations reveal that the large negative D values for the three complexes stem from their easy-axis magnetic anisotropy. Ac magnetic susceptibility measurements disclosed field-induced slow magnetic relaxation behaviors and the presence of Raman and/or direct processes of the three complexes at various applied dc fields.

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