Nawarathne, W. D. T. J.2024-10-242024-10-242013https://ir.lib.pdn.ac.lk/handle/20.500.14444/2475Macrocyclic metal complexes are very stable species and they have unusual electronic and electrochemical properties. Therefore they have numerous applications. Recently , much attention has been paid to electrocatalytic reduction of small hazardous gas molecules such as CO₂ by macrocyclic complexes. Therefore the major concern of this research project was to synthesize transition metal macrocyclic complexes capable of the utilization of CO₂. In this research project Ni(II)TMTAA and Cu(II)TMTAA complexes were synthesized by template synthesis method and characterized by Cyclic voltammetric, XRD, XRF, H-NMR, FTIR and UV-visible spectroscopic techniques. The CO₂ Trapping capabilities of these complexes were studied by a VenireLabPro CO₂ Gas Sensor. The UV-Visible spectroscopic data of Ni(II)TMTAA complex shows interesting acid base properties and anion(SCN⁻, HCO₃⁻, Br⁻ and I⁻ ) binding capabilities. It has absorbed approximately 20% more CO₂ than its starting material, nickel acetate. The synthesized dark green Cu(II)TMTAA complex shows reversible acid base properties unlike Ni(II)TMTAA complex. This complex shows HCO₃⁻ trapping capabilities and approximately 30% more CO₂ absorbance capacity than its starting material, copper acetate . The cyclic voltametric (CV) data reveals that both complexes have electrocatalytic reduction of CO₂.en-USMacrocyclicCarbon dioxideThesis