Breaching the Fortress: Photochemistry of DNA-Caged Ag₁₀⁶.

ABSTRACT: A DNA strand can encapsulate a silver molecule to create a nanoscale, aqueous stable chromophore. A protected cluster that strongly fluoresces can also be weakly photolabile, and we describe the laser-driven photochemistry of the green fluorophore C₄AC₄TC₃GT₄/Ag₁₀⁶⁺. The embedded cluster is selectively photoexcited at 490 nm and then bleached, and we describe how the efficiency, products, and route of this photochemical reaction are controlled by the DNA cage. With irradiation at 496.5 nm, the cluster absorption progressively drops to give a photodestruction quantum yield of 1.5 (±0.2) × 10^-4, ∼10³× less efficient than fluorescence. A new λ_abs = 335 nm chromophore develops because the precurs

SUBMITTER: Setzler CJ 

PROVIDER: S-EPMC10749453 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature