A Mn(I)-based
hybrid system (OrgD-|TiO2|-MnP) for photocatalytic
CO2 reduction is designed to be a
coassembly of Mn(4,4′-Y2-bpy)(CO)3Br
(MnP; Y = CH2PO(OH)2) and (E)-3-[5-(4-(diphenylamino)phenyl)-2,2′-bithiophen-2′-yl]-2-cyanoacrylic
acid (OrgD) on TiO2 semiconductor particles. The OrgD-|TiO2|-MnP hybrid reveals persistent photocatalytic
behavior, giving high turnover numbers and good product selectivity
(HCOO– versus CO). As a typical run, visible-light
irradiation of the hybrid catalyst in the presence of 0.1 M electron
donor (ED) and 0.001 M LiClO4 persistently produced HCOO– with a >99% selectivity accompanied by a trace
amount
of CO; the turnover number (TONformate) reached ∼250
after 23 h of irradiation. The product selectivity (HCOO–/CO) was found to be controlled by changing the loading amount of MnP on the TiO2 surface. In situ FTIR analysis of the hybrid during photocatalysis revealed that,
at low Mn concentration, the Mn–H monomeric mechanism associated
with HCOO– formation is dominant, whereas at high
Mn concentration, CO is formed via a Mn–Mn dimer mechanism.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.