Synthesis of transition metal macrocyclic complexes for the utilization of CO2
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Date
2013
Authors
Nawarathne, W. D. T. J.
Journal Title
Journal ISSN
Volume Title
Publisher
The University of Peradeniya
Abstract
Macrocyclic 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.
Description
Keywords
Macrocyclic , Carbon dioxide