The chemical fixation of carbon dioxide by tetramethylguanidine and triazabicyclo dec-5-ene bases

Abstract

The fixation of CO₂ using guanidine bases; 1,1,3,3-tetramethylguanidine (TMG) and 5,7-triazabicyclo[4.4.0] dec-5-ene (TBD) has been investigated. Solution Nuclear magnetic resonance (NMR) studies were carried out for the reaction between CO₂ and the guanidine bases at normal temperature and pressure, i.e Ca. 30 °C and 1 atm. Analysis of results obtained using 1- dimentional ¹³C NMR and 2-dimentional ¹⁵N (HMBC) both indicated successful reaction between CO₂ and TBD and also CO₂ with TMG. Both products were observed to be stable at room temperature and pressure. Based on the results obtained, it was concluded that, the CO₂ can be fixed with TMG and TBD at normal conditions of temperature and pressure. Finally it was also proposed that, the method used could be useful for the uptake and release of atmospheric CO₂.

Keywords: Carbon dioxide, Chemical fixation, Heteronuclear Multiple-Bond Correlation Tetramethylguanidine, Triazabicyclo decene