Adenine Tagged Mn-Based Coordination Polymer for Conversion of Carbon Dioxide to Cyclic Carbonates under Atmospheric Pressure

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Natural processes collectively balance the global carbon cycle, effectively controlling atmospheric carbon dioxide (CO 2 ) levels. However, excessive CO 2 emissions due to industrialization and population growth have disrupted natural processes by increasing the atmospheric CO 2 concentration. To address this issue, CO 2 capture and conversion have been implemented. Metal–organic frameworks (MOFs)/coordination polymers (CPs) with bioligands, such as amino acids and nucleobases, are receiving much interest. However, bio-MOFs are not much reported due to the lack of control over their coordination with metal ions. In this work, we have developed an adenine-tagged Mn-CP with dominant basic sites, [Mn(IPT 2– )(Ade)(DMF)] n (IPT 2– = isophthalate; Ade = adenine; DMF = N, N ′-dimethylformamide). The analysis of isosteric heat ( Q st ) of CO 2 adsorption supported the presence of strong interactions between CO 2 and Mn-CP. Mn-CP demonstrated moderate to outstanding performance in coupling CO 2 with smaller and larger epoxides at ambient pressure under neat conditions. The thermodynamic activation parameters indicate that Mn-CP operates through an associative mechanism (Δ S ⧧ = −283.4 J mol −1 K −1 ), with a reduced kinetic barrier characterized by Δ H ⧧ of 17.28 kJ mol –1 and E a of 20.5 kJ mol –1 . The catalytic efficiency of Mn-CP was particularly notable in the coupling reaction of epichlorohydrin and CO 2, yielding 92% of the corresponding cyclic carbonate under atmospheric pressure.