Zinc(II) Monomeric, Dimeric, and Trimeric Photosensitizers with Microsecond-Lived Intra-ligand Charge Transfer Excited States Investigated through Time-Resolved Optical and X-Ray Spectroscopy.

ABSTRACT: Zn^II photosensitizers relative to Cu^I complexes have received less attention due to their energetically higher metal-to-ligand charge transfer states. Three Zn^II complexes, namely a Monomer, a bimetallic helicate, and a trimetallic helicate, bearing phenanthroline ligands are hereby studied through time-resolved X-ray absorption (tr-XAS) and femto-microsecond optical transient absorption spectroscopy (OTA). The formation of intraligand singlet charge transfer (^IILCT) excited states is achieved within femtoseconds, followed by intersystem crossing (ISC) in nanoseconds to generate microsecond-lived triplet (³ILCT) states. Femtosecond OTA shows that the ¹ILCT states in the Monomer, Dimer, and Trimer occur within 235 fs, 683 fs,

SUBMITTER: Sauvan M 

PROVIDER: S-EPMC12376253 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature