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• W2070157536 abstract "A series of platinum-containing organometallic dimer complexes has been synthesized and the photophysical properties have been investigated under one- and two-photon (2PA) absorption conditions. The complexes have the general structure [DPAF−C≡C−Pt(PBu3)2−C≡C−Ar−C≡C−Pt(PBu3)2−C≡C−DPAF], where Ar is a π-conjugated unit, Bu = n-butyl, and DPAF = diphenylamino-2,7-fluorenylene. The core Ar units include 1,4-phenylene, 2,5-thienylene, 5,5′-(2,2′-bithienylene), 2,5-(3,4-ethylenedioxythiophene, 2,1,3-benzothiadiazole, and 4,7-dithien-2-yl-2,1,3-benzothiadiazole. Absorption and photoluminescence spectroscopy indicates that the complexes feature low-lying excited states based on both the core [-Pt(PBu3)2−C≡C−Ar−C≡C−Pt(PBu3)2-] chromophore as well as the DPAF units. Photoexcitation of the complexes produces a singlet state excited state, which rapidly undergos intersystem crossing to afford a triplet state that has a lifetime in the microsecond time domain. In most cases, the lowest energy triplet state is localized on the core chromophore. Femtosecond 2PA spectra are measured along with triplet−triplet absorption spectra and nanosecond intensity-dependent transmission for solutions of the complexes. Each of the complexes features a 2PA absorption band in the near-infrared region (λ ≈ 700−750 nm) with a cross section 50−200 GM that is ascribed to the DPAF chromophore. The complexes also feature broad triplet−triplet absorption throughout the visible and near-infrared regions (λ ≈ 500−800 nm, ϵTT ≈ 5−10 × 104 M−1 cm−1). Each of the complexes exhibits efficient nonlinear absorption of nanosecond pulses in the near-infrared region (600−800 nm), and we demonstrate that effect is most efficient in the chromophores where the 2PA cross section maxima coincides spectrally with the excited triplet state absorption." @default.
• W2070157536 created "2016-06-24" @default.
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• W2070157536 date "2010-06-10" @default.
• W2070157536 modified "2023-09-24" @default.
• W2070157536 title "Optimizing Simultaneous Two-Photon Absorption and Transient Triplet−Triplet Absorption in Platinum Acetylide Chromophores" @default.
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• W2070157536 doi "https://doi.org/10.1021/jp1005567" @default.
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