Synthesis, crystal structures and electrocatalytic properties of 2D and 3D Co(Ⅱ) Coordination polymers based on semi-rigid tricarboxylic acid ligand

•Two novel cobalt coordination polymers, formulated as {[Co2(TMCA)(OH)(DMF)(H2O)]}n (1), {[Co3(TMCA)2]}n (2) with alluring topologies have been successfully fabricated under hydrothermal conditions.•Interesting, due to the flexibility of the H3TMCA, the final frameworks of 1-2 can change depending on the reaction of temperature and solvents.•Furthermore, 1-2 embody good thermal stability and OER performance.