Oxidative quenching within photosensitizer-acceptor dyads based on bis(bidentate) phosphine-connected osmium(II) bipyridyl light absorbers and reactive metal sites.

ABSTRACT: For the first time oxidative quenching of OsP₂N₄ chromophores by reactive Pt^II or Pd^II sites containing cis, trans, cis-1,2,3,4-tetrakis(diphenylphosphino)cyclobutane (dppcb) is directly observed despite the presence of a saturated cyclobutane backbone "bridge". This dramatic effect is measured as a sudden temperature-dependent onset of a reduction in phosphorescence lifetime in [Os(bpy)₂(dppcb)MCl₂](SbF₆)₂ (M = Pt, 1; Pd, 2). The appearance of this additional energy release is not detectable in [Os(bpy)₂(dppcbO₂)](PF₆)₂ (3), where dppcbO₂ is cis, trans, cis-1,2-bis(diphenylphosphinoyl)-

SUBMITTER: Eller S 

PROVIDER: S-EPMC3587338 | biostudies-literature | 2012 Sep

REPOSITORIES: biostudies-literature