Understanding and controlling the efficiency of Au₂₄M(SR)₁₈ nanoclusters as singlet-oxygen photosensitizers.

ABSTRACT: Singlet oxygen, ¹O₂, can be generated by molecules that upon photoexcitation enable the ³O₂ → ¹O₂ transition. We used a series of atomically precise Au₂₄M(SR)₁₈ clusters, with different R groups and doping metal atoms M. Upon nanosecond photoexcitation of the cluster, ¹O₂ was efficiently generated. Detection was carried out by time-resolved electron paramagnetic resonance (TREPR) spectroscopy. The resulting TREPR transient yielded the ¹O₂ lifetime as a function of the nature of the cluster. We found that: these clusters indeed generate ¹O₂ by forming a triplet state; a more positive oxidation potential of the molecular cluster corresponds

SUBMITTER: Agrachev M 

PROVIDER: S-EPMC8524663 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature