Substituent dependent dimensionalities in cobalt isophthalate supramolecular complexes and coordination polymers containing dipyridylamine ligands

► Cobalt 5-substituted isophthalate complexes with 4,4′-dipyridylamine (dpa) ligands. ► Dimensionalities depend on substituent sterics and hydrogen-bonding capability. ► Uncommon 658 cds topology in methyl derivative. ► Parallel interpenetration of layer motifs in tert-butyl and methoxy derivatives. ► Antiferromagnetic coupling with single ion effects in methyl and tert-butyl derivatives.