Ultrasound‐driven design and catalytic activity of nanostructured Cobalt (II) 3D‐supramolecular coordination polymer

• 3D - supramolecular coordination polymer [Co(EIN) 4 (SCN) 2 ], SCP 1 and nanoparticles of [Co(EIN) 4 (SCN) 2 ], SCP 1 \ were synthesized by self-assembly method and under ultrasonic radiation, respectively. • The asymmetric unit of SCP 1 consists of one cobalt atom, four EIN ligands and two thiocyanate anions as co-ligands where the Co II atom adopts octahedral geometry. • SCP1 and SCP1\ support very efficient catalytic activity towards degradation of indigo carmine dye (IC) as a target pollutant within very short times under UV-light or ultrasonic radiation at pH=9. Nanosized photo-catalysts are an intriguing study topic for achieving high catalytic performance. The self-assembly reaction and ultrasonication-induced self-assembly of, cobalt nitrate hexahydrates, ethyl isonicotinate (EIN) and SCN anion as connecting ligand, resulted in the crystalline supramolecular coordination polymer, SCP 1 ; [Co(EIN) 4 (SCN) 2 ], and the nanoparticles SCP 1 \ , [Co (EIN) 4 (SCN) 2 ], respectively. X-ray diffraction of single crystals SCP 1 indicated octahedral geometry of Co II . SCP 1 's network structure is made up of [Co(EIN) 4 (SCN) 2 ] fragments linked via extended hydrogen bonds, creating 1D-chains. The production of H-bonds, which extend the structure to a 3D-network, is dependent on the free ethyl carboxylate groups. SCP 1 and SCP 1 \ were characterised with different structural characterization techniques and spectral studies. The catalytic evaluations of SCP 1 and SCP 1 \ as heterogeneous catalysts bolster exceptionally effective catalytic action towards the corruption of indigo carmine color (IC) as a targeted pollutant in exceptionally brief times beneath UV-radiation or ultrasonic waves. To detect the reactive oxygen species and reaction mechanism, photoluminescence probing technology was applied using the disodium salt of terephthalic acid.