Chiral Dy(III) Fluorescent Single-Molecule Magnet Based on an Achiral Flexible Ligand

A novel multi-channel barcode module was developed by using chiral co-crystals which contain field-induced SMM behavior and different emission bands. The chiral co-crystals [Zn(H2L)Dy(DBM)(2)](4)(ClO4)(4)center dot 9CH(3)OH center dot H2O (1a) and [Zn(H2L)Dy(DBM)(2)](4)(ClO4)(4)center dot 8CH(3)OH center dot 0.5H(2)O (1b) (H4L = 2,2'-[1,2-ethanediylbis[(hydroxyethylimino)methylene]]bis[6-methoxy-4-methyl-phenol], HDBM = dibenzoylmethane) were obtained through one-pot reaction of Zn-II and Dy-III with the achiral ligands H4L and HDBM. X-ray single crystal diffraction and CD spectroscopy confirmed that they are enantiomers crystallized in P4(3) (1a) and P4(1) (1b), both consisting of two Delta-[Zn(H2L)Dy(DBM)(2)](+) cations, two Lambda-[Zn(H2L)Dy(DBM)(2)](+) cations and four (ClO4)(-) anions. The presence of Dy-III ions endow them with the property of field-induced slow magnetic relaxation. The relatively low energy barrier of 35.0(9) K for complex 1 may be due to the poor axiality of the ligand field caused by the long Dy-O-phenoxy bond lengths and the small O-phenoxy-Dy-O-phenoxy bond angles. Moreover, when the organic ligands H4L (lambda(ex) = 350 nm) and Dy-III (lambda(ex) = 420 nm) are excited, different emission spectra are observed.