Synthesis, structures and magnetic properties of π-stacked supermolecular dysprosium(III) complexes with 8-hydroxyquinoline

In this work, we report three Dy III complexes, namely, [Dy 3 (ql) 8 Cl(Hql)]·3CH 3 OH·H 2 O ( 1 ; Hql = 8-hydroxyquinoline), [Dy 3 (ql) 7 (NO 3 ) 2 (Hql)]·3CH 3 CN ( 2 ) and [Dy 2 (ql) 3 (Xa)(NO 3 ) 2 (CH 3 OH) 2 (H 2 O)] ( 3 , HXa = xanthene-9-carboxylic acid). Both 1 and 2 feature quasi-linear trinuclear cluster structures, while 3 has a dinuclear structure. Significantly, diverse intermolecular π-π interactions led to the structural variety in three systems, forming supermolecular dimers of 1 and 3 , and a supramolecular 2D honeycomb-like framework of 2 . Magnetic studies demonstrate that 1 and 3 exhibit field induced dual relaxation behavior. The efficient energy barriers for their slow relaxation processes are only 3.0 and 2.1 K. In contrast, 2 displays zero-field relaxation behavior, with an efficient energy barrier of 140 K. This work highlights how ligand field engineering and π-π stacking interactions synergistically modulate relaxation dynamics in lanthanoid single-molecule magnets systems.