title: Photophysics of monodisperse platinum-acetylide oligomers: delocalization in the singlet and triplet excited states.
abstract: A series of monodisperse Pt-acetylide polymers that contain the [-CC-(p-C6H4)-CC-(t-Pt(PBu3)2)-]n repeat unit has been prepared for n = 1, 2, 3, 4, 5, and 7. The photophysical properties of the series provide information concerning the relationship between the oligomer length and delocalization in the singlet and triplet excited states of the pi-conjugated electron system. The results imply that the singlet excited state is delocalized over approximately 6 repeat units; however, the triplet state is considerably more localized. The triplet energy is almost invariant with oligomer length, but the phosphorescence spectra and triplet nonradiative decay rates indicate that the electron-vibrational coupling in the triplet state decreases with increasing oligomer length.
authors.affiliation: Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200, USA.
authors.forename: Yao
authors.initials: Y
authors.lastname: Liu
authors.forename: Shujun
authors.initials: S
authors.lastname: Jiang
authors.forename: Ksenija
authors.initials: K
authors.lastname: Glusac
authors.forename: David H
authors.initials: DH
authors.lastname: Powell
authors.forename: Danielle F
authors.initials: DF
authors.lastname: Anderson
authors.forename: Kirk S
authors.initials: KS
authors.lastname: Schanze