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Three new bioactive nanosized supramolecular cobalt coordination polymers; {[Co2(tyr)2(Morph)2(Cl)2(H2O)2]}n (1), {[Co(Morph)6]+2[Co(bdc)(Morph)2(Cl)2]−2.3H2O}n (2) and {[Co(Morph)6]+2[Co(H2btec)(Morph)3(H2O)]−2.10H2O}n (3), where L-tyr = L-tyrosine, H2bdc = Terephthalic acid, H4btec = Pyromellitic acid and Morph = Morphline, they were prepared and characterized by elemental analysis, FT-IR and UV–VIS spectroscopies, magnetic, molar conductance, TGA/DTA, XRPD, catalytst and MM2 theoretical calculations. In all three compounds, the Morph ligand adopts a bidentate chelating coordination mode and the carboxylate anions of bdc−2 and H2btec−2 act as monodentate ligands while the tyr−1 anion act as bidentate ligand. The coordination geometry of the cobalt centers is an octahedral. The variation of carboxylates, morphline and central cobalt ions exerts a significant effect on the structures, properties and biological activity. Kinetic and thermodynamic parameters (n, E*, Z, ΔH*, ΔS* and ΔG*) were computed using Coats–Redfern equations and discussed, which confirms the second order kinetics. From the XRPD patterns, the crystal parameters as well as the particle sizes of the complexes could be evaluated. Complexes exhibit catalytic activity. The biological activity of the compounds has also been study against different bacteria and fungi. [ABSTRACT FROM AUTHOR]