Assembly of Homochiral Magneto-Optical Dy 6 Triangular Clusters by Fixing Carbon Dioxide in the Air.

A new hydrazone Schiff base bridging ligand (H 2 L Schiff ( E )- N '-((1-hydroxynaphthalen-2-yl)methylene)pyrazine-2-carbohydrazide) and L / D -proline were used to construct a pair of homochiral Dy 6 cluster complexes, [Dy 6 (CO 3 )( L -Pro) 6 (L Schiff ) 4 (HL Schiff ) 2 ]·5DMA·2H 2 O ( L - 1 , L -HPro = L -proline; DMA = N , N -dimethylacetamide) and [Dy 6 (CO 3 )( D -Pro) 6 (L Schiff ) 4 (HL Schiff ) 2 ]·5DMA·2H 2 O ( D - 1 , D -HPro = D -proline), which show a novel triangular Dy 6 topology. Notably, the fixation of CO 2 in the air formed a carbonato central bridge, playing a key role in assembling L - 1 / D - 1 . Magnetic measurements revealed that L - 1 / D - 1 displays intramolecular ferromagnetic coupling and magnetic relaxation behaviours. Furthermore, L - 1 / D - 1 shows a distinct magneto-optical Faraday effect and has a second harmonic generation (SHG) response (1.0 × KDP) at room temperature. The results show that the immobilization of CO 2 provides a novel pathway for homochiral multifunctional 4f cluster complexes.