Synthesis, Characterization and Photobiological Studies of Ru(II) Dyads Derived from α-Oligothiophene Derivatives of 1,10-Phenanthroline.

ABSTRACT: Three new bis(2,2'-bipyridine)-heteroleptic Ru(II) dyads incorporating thienyl groups (n = 1-3, compounds 1, 2 and 3, respectively) appended to 1,10-phenanthroline were synthesized and characterized to investigate the impact of n on the photophysical and photobiological properties within the series. All three complexes showed unstructured emission near 618 nm from a triplet metal-to-ligand charge transfer (³ MLCT) state with a lifetime (τ_em ) of approximately 1 μs. Transient absorption measurements revealed an additional excited state that was nonemissive and long-lived (τ_TA  = 43 μs for 2 and 27 μs for 3), assigned as a triplet intraligand (³ IL) state that was accessible only in 2 and 3. All three complexes were strong singlet oxygen (¹

SUBMITTER: Monro S 

PROVIDER: S-EPMC6347502 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature