Construction of 5-Aminodiacetic Isophthalate Based Nickel(II) Complexes with Diverse Topologies through Modulating the Auxiliary Ligands

Four nickel(II)-5-aminodiacetic isophthalate coordination polymers with different auxiliary ligands are synthesized by the solvothermal method. {[Ni4(adip)2(H2O)10]·6H2O}n (1) (H4adip = 5-aminodiacetic isophthalic acid) is a supermolecular structure assembled by two-dimensional (2D) layers, and it can be viewed as a novel binodal (3,4)-connected topological net with a Schläfli symbol of (4.6.8)4(62.82.102) which has not been reported in the literature. When dipyridyl auxiliary ligands with different spacers are engaged in the reactions to pillar the 2D layers of 1, the 3D frameworks of complexes 2–4 are obtained. {[Ni3(Hadip)2(bpy)2(H2O)4]·9H2O}n (2) (bpy = 4,4′-bipyridine) was crystallographically characterized to be a three-dimensional (3D) coordination network with SPC519 type topology. {[Ni8(adip)4(bpy)(H2O)18]·10H2O}n (3) as a 3D framework exhibits a scarcely reported (3,5)-connected topology with a Schläfli symbol of (4.6.8)4(62.86.102). {[Ni2(adip)(bpp)(H2O)2]·2H2O}n (4) (bpp = 1,3-bis (4-pyridyl)propane) features a 3D chiral framework composed of the achiral reagents adip4– and bpp, resulting a new (4.52)(4.53.72.84) topology. Meanwhile, the influences of configuration and length of the auxiliary ligands on the structures are investigated. The magnetic studies indicate antiferromagnetic behaviors for complexes 1 and 3, and as their metal–metal distances in the dinulcear units increase the antiferromagnetic interactions become stronger.