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ACS Appl Mater Interfaces. 2013 Feb;5(3):565-72. doi: 10.1021/am3018724. Epub 2013 Jan 15.

Extending the bandwidth of reverse saturable absorption in platinum complexes using two-photon-initiated excited-state absorption.

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Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States.


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.


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