title: Extending the bandwidth of reverse saturable absorption in platinum complexes using two-photon-initiated excited-state absorption.
abstract: Pt(II) complexes bearing 4-(7-(benzothiazol-2'-yl)-9,9-diethylfluoren-2-yl)-2,2':6',2″-terpyridine or 4-(7-(benzothiazol-2'-yl)-9,9-diethylfluoren-2-yl)ethynyl-2,2':6',2″-terpyridine ligand exhibit strong reverse saturable absorption in the visible spectral region and large two-photon initiated excited-state absorption in the near-IR region. They are promising broadband nonlinear absorbing materials from the visible to the near-IR region. The extended π-conjugation in complex 2 that has a C≡C linker between the terpyridine ligand and the 4-(7-(benzothiazol-2'-yl)-9,9-diethylfluoren-2-yl) substituent significantly increases the two-photon absorption cross sections (σ(2)), making it among the strongest of two-photon absorbing Pt(II) complexes.
authors.affiliation: Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States.
authors.forename: Bingguang
authors.initials: B
authors.lastname: Zhang
authors.forename: Yunjing
authors.initials: Y
authors.lastname: Li
authors.forename: Rui
authors.initials: R
authors.lastname: Liu
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Pritchett
authors.forename: Joy E
authors.initials: JE
authors.lastname: Haley
authors.forename: Wenfang
authors.initials: W
authors.lastname: Sun