Two phenoxo-O bridged Dy2 complexes based on 8-hydroxyquinolin derivatives with different magnetic relaxation features.

Two new dinuclear dysprosium compounds, namely, [Dy 2 (L1) 2 (hfac) 6 ]·C 7 H 16 ( 1 ) and [Dy 2 (L2) 2 (hfac) 6 ]·C 7 H 16 ( 2 ) (HL1 = 5-(2-thenylidene)-8-hydroxylquinoline; HL2 = 5-(4-methoxylbenzylidene)-8-hydroxylquinoline; hfac = hexafluoroacetylacetonate) have been successfully obtained via applying two different ligands, and further characterized by crystallography. Structural analysis shows that both of 1 and 2 possess a four-membered [Dy 2 O 2 ] core with similar coordination pockets. The center Dy(III) ions in 1 and 2 are all completed by eight coordination environments with O 8 set. Interestingly, the different features of ligand HL1 and HL2 result in their different magnetic relaxation behaviors with the energy barrier of 6.81 K for 1 and 0.72 K for 2 . [ABSTRACT FROM AUTHOR]