Salicylate and salicylic acid derivatives act aselectron donors via a charge-transfer complex whenadsorbed on semiconducting surfaces. When photoexcited,charge is injected into the conduction band directly fromtheir highest occupied molecular orbital (HOMO) withoutneeding mediation by the lowest unoccupied molecularorbital (LUMO). In this study, we successfully induce thechemical participation of carbon dioxide in a charge transferstate using 3-aminosalicylic acid (3ASA). We determine thegeometry of CO2 using a combination of UV-vis, SERS, 13CNMR, and EPR. We find CO2 binds on Ti sites in acarbonate form and discern via EPR a surface Ti-centeredradical in the vicinity of CO2, suggesting successful chargetransfer from the sensitizer to the neighboring site of CO2.This study opens the possibility of analyzing the structuraland electronic properties of the anchoring sites for CO2 onsemiconducting surfaces and proposes a pathway for CO2 remediation.

CO<sub>2</sub> pre-activation via charge transfer states of TiO<sub>2</sub>-aminosalicylic acid complexes

245th National Meeting (2013)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.

CO2 pre-activation via charge transfer states of TiO2-aminosalicylic acid complexes

CO₂ pre-activation via charge transfer states of TiO₂-aminosalicylic acid complexes