Synthesis, Structures and Magnetic Properties of two Heteroleptic Dy3+ Borohydride Complexes

Abstract We report the synthesis, structures and magnetic properties of two Dy 3+ heteroleptic complexes [Dy(BH 4 ) 2 (THF) 5 ][BPh 4 ] ( 1 ) and [Dy(BH 4 ) 2 ( t Bu 4 Carb)(THF)] ( 2 ) ( t Bu 4 Carb=1,3,6,8‐tetra‐tert‐butyl‐9H‐carbazole). Both complexes show a κ 3 ‐coordination mode of the borohydride anion but distinct geometries. Whereas the cationic complex 1 does not exhibit a slow relaxation of the magnetization, the neutral complex 2 behaves as a field‐induced single‐molecule magnet.