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Open AccessArticle

Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene Dyads

1
Department of Chemistry, Institute of Nanoscience and Engineering Technology, University of Massachusetts Lowell, Lowell, MA 01854, USA
2
Department of Physics, National University of Singapore, Singapore 117542, Singapore
3
Functional Materials Division, AFRL/RXA, Air Force Research Laboratory, Wright-Patterson Air Force Base, Dayton, OH 45433, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Molecules 2016, 21(5), 647; https://doi.org/10.3390/molecules21050647
Received: 27 March 2016 / Revised: 27 April 2016 / Accepted: 6 May 2016 / Published: 14 May 2016
(This article belongs to the Special Issue Fullerene and the Related Curved-pi Materials Chemistry)
We synthesized four C60-(light-harvesting antenna) dyads C60 (>CPAF-Cn) (n = 4, 9, 12, or 18) 1-Cn for the investigation of their broadband nonlinear absorption effect. Since we have previously demonstrated their high function as two-photon absorption (2PA) materials at 1000 nm, a different 2PA wavelength of 780 nm was applied in the study. The combined data taken at two different wavelength ranges substantiated the broadband characteristics of 1-Cn. We proposed that the observed broadband absorptions may be attributed by a partial π-conjugation between the C60 > cage and CPAF-Cn moieties, via endinitrile tautomeric resonance, giving a resonance state with enhanced molecular conjugation. This transient state could increase its 2PA and excited-state absorption at 800 nm. In addition, a trend of concentration-dependent 2PA cross-section (σ2 ) and excited-state absorption magnitude was detected showing a higher σ value at a lower concentration that was correlated to increasing molecular separation with less aggregation for dyads C60(>CPAF-C18) and C60(>CPAF-C9), as better 2PA and excited-state absorbers. View Full-Text
Keywords: C60-(light-harvesting antenna) nanostructures; Z-scan measurements; ultrafast two-photon absorption; nonlinear absorption C60-(light-harvesting antenna) nanostructures; Z-scan measurements; ultrafast two-photon absorption; nonlinear absorption
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MDPI and ACS Style

Jeon, S.; Wang, M.; Ji, W.; Tan, L.-S.; Cooper, T.; Chiang, L.Y. Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene Dyads. Molecules 2016, 21, 647. https://doi.org/10.3390/molecules21050647

AMA Style

Jeon S, Wang M, Ji W, Tan L-S, Cooper T, Chiang LY. Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene Dyads. Molecules. 2016; 21(5):647. https://doi.org/10.3390/molecules21050647

Chicago/Turabian Style

Jeon, Seaho; Wang, Min; Ji, Wei; Tan, Loon-Seng; Cooper, Thomas; Chiang, Long Y. 2016. "Broadband Two-Photon Absorption Characteristics of Highly Photostable Fluorenyl-Dicyanoethylenylated [60]Fullerene Dyads" Molecules 21, no. 5: 647. https://doi.org/10.3390/molecules21050647

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