Circularly polarized luminescence and magneto-optic effects from chiral Dy() single molecule magnets

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 52; no. 22; pp. 7646 - 7651
• Main Authors: Huang, Hong, Sun, Rong, Wu, Xiao-Fan, Liu, Youchao, Zhan, Jun-Zheng, Wang, Bing-Wu, Gao, Song
• Format: Journal Article
• Language: English
• Published: England Royal Society of Chemistry 06.06.2023
• Subjects: Circular polarization; Dichroism; Dimethylformamide; Enantiomers; Imines; Luminescence; Magnetic materials; Magnets; Room temperature
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d3dt00625e

A new pair of multifunctional Zn( ii )-Dy( iii ) enantiomers based on the chiral Schiff-base ligands [ R , R -ZnLDy(H 2 O)(NO 3 ) 3 ] ( 1 R 2 R -ZnDy ) and [ S , S -ZnLDy(H 2 O)(NO 3 ) 3 ] ( 1 S 2 S -ZnDy ) (H 2 L = phenol, 2,2′-[[(1 R ,2 R /1 S ,2 S )-1,2-diphenyl-1,2-ethanediyl]bis[( E )-nitrilomethylidyne]]bis[6-methoxy]) was synthesized and characterized. Magnetic studies indicate that 1 R 2 R -ZnDy behaves as a single-molecule magnet. Enantiomers 1 R 2 R -ZnDy and 1 S 2 S -ZnDy show chiroptical activity and circularly polarized luminescence in the N , N -dimethylformamide (DMF) solution. The chiral Zn( ii )-Dy( iii ) complexes display magnetic circular dichroism signals at room temperature. Accordingly, these complexes will inspire intriguing research on single-molecule magnets with circular polarization of luminescence activity and magneto-optic effects, which will give new clues to design multifunctional molecular magnetic materials. This is the first time that circularly polarized luminescence and obvious magneto-optical effects have been observed simultaneously in a single-molecule magnet.