Tailoring Coordination Polymers by Substituent Effect: A Bifunctional CoII‐Doped 1D‐Coordination Network with Electrochemical Water Oxidation and Nitroaromatics Sensing

Three Cd^II coordination polymers (CPs) were synthesized with a tripodal ligand N,N‘,N‘ ‘‐tris(4‐pyridinylmethyl)‐1,3,5‐benzenetricarboxamide in combination with three different substituted isophthalic acids with general formulas {Cd₂( L )(NIP)₂(H₂O)₂].4H₂O}_n, (CP‐ 1 ), {Cd₂( L )(AIP)₂(H₂O)₂].4H₂O}_n, (CP‐ 2 ) and {Cd( L )(BIP) (H₂O)].4H₂O}_n, (CP‐ 3 ). The substituent groups on the co‐ligand had profound effect on the network topologies of the corresponding CPs as well as their properties. Out of the three, CP‐ 1 and 2 were found to form 3D networks whereas CP‐ 3 was a 1D linear chain with uncoordinated pyridyl sites. Due to its structural features CP‐ 3 was found to show interesting properties. The 1D CP containing uncoordinated pyridyl site exhibited an excellent ability for doping with Co^II which in turn acts as an efficient water oxidation electrocatalyst with required overpotential of 380 mV for an anodic current density of 1 mA cm^?2. The CP also exhibited luminescence‐based detection of nitroaromatics (LOD: 0.003 mm ) without any significant interference in presence of other organic compounds.