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Homochiral Dy2Zn2 zero-field single-molecule magnets derived from (R)/(S)-2-methoxy-2-phenylacetic acids
Cai-Ming Liu1, Xiang Hao1, Yi-Quan Zhang2
1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory for Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. cmliu@iccas.ac.cn.
None:
Despite the unique advantages of multifunctional integration at the nanoscale, chiral zero-field single-molecule magnets (SMMs), especially those based on homochiral carboxylic acids, are still difficult to obtain. Herein, homochiral (R)/(S)-2-methoxy-2-phenylacetic acids (R-HMPA)/(S-HMPA) were selected as the bridging ligands to assemble a pair of Dy2Zn2 enantiomers based on the Schiff base ligand (E)-2-((2-hydroxy-3-methoxybenzylidene)amino)phenol (H2LSchiff), [Dy2Zn2(S-MPA)2(LSchiff)4(DMF)2]·2DMF (S-1) (DMF = N,N-dimethylformamide) and [Dy2Zn2(R-MPA)2(LSchiff)4(DMF)2]·2DMF (R-1), which possess a [Dy2Zn2O6] defective dicubane core. The CD spectra of R-1 and S-1 confirmed their enantiomeric nature and chiral optical activities. Magnetic studies revealed that they are good zero-field SMMs, with a relatively large Ueff/k value of 234.6 K at 0 Oe and an obvious hysteresis loop at 3.0 K; notably, these magnetic properties could be explained using ab initio calculations.
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