Effect of Nitrogen Donor Disposition on Topology in Cobalt Isophthalate Coordination Polymers Containing Dipyridylamide Ligands

Abstract

AbstractCobalt coordination complexes containing a substituted isophthalate ligand and hydrogen‐bonding capable dipyridylamide ligands were prepared hydrothermally and structurally characterized by single‐crystal X‐ray diffraction. {[Co(nip)(3‐pina)]n (1) (nip = 5‐nitroisophthalate, 3‐pina = 3‐pyridylisonicotinamide) displays [Co(nip)]n 1D ribbon motifs with embedded {Co2(OCO)2} dimeric units, linked by L‐shaped 3‐pina tethers into a 3D [Co(nip)(3‐pina)]n coordination polymer network with pcu topology. In contrast, {[Co(nip)(4‐pmina)(H2O)]·H2O}n (2) (4‐pmina = 4‐pyridylmethylisonicotinamide) manifests a twofold interpenetrated 66 topology diamondoid network. {[Co(meoip)(3‐pina)]n (3) (meoip = 5‐methoxyisophthalate) has a dimer‐based 3D pcu network as seen in 1. [Co(meoipH)2(4‐pmina)2(H2O)2] (4) contains neutral coordination complexes linked by hydrogen‐bonding into supramolecular ribbons. Thermal properties of these new solids were also investigated.