Low power threshold photochemical upconversion using a zirconium(iv) LMCT photosensitizer.

ABSTRACT: The current investigation demonstrates highly efficient photochemical upconversion (UC) where a long-lived Zr(iv) ligand-to-metal charge transfer (LMCT) complex serves as a triplet photosensitizer in concert with well-established 9,10-diphenylanthracene (DPA) along with newly conceived DPA-carbazole based acceptors/annihilators in THF solutions. The initial dynamic triplet-triplet energy transfer (TTET) processes (ΔG ∼ -0.19 eV) featured very large Stern-Volmer quenching constants (K _SV) approaching or achieving 10⁵ M^-1 with bimolecular rate constants between 2 and 3 × 10⁸ M^-1 s^-1 as ascertained using static and transient spectroscopic techniques. Both the TTET and subsequent triplet-triplet annihilation (TTA)

SUBMITTER: Yang M 

PROVIDER: S-EPMC8261719 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature