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Energy transfer in supramolecular calix[4]arene—Perylene bisimide dye light harvesting building blocks: Resolving loss processes with simultaneous target analysis

Journal of Photochemistry and Photobiology, ISSN: 2666-4690, Vol: 12, Page: 100154
2022
  • 4
    Citations
  • 0
    Usage
  • 3
    Captures
  • 1
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

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  • Citations
    4
  • Captures
    3
  • Mentions
    1
    • News Mentions
      1
      • News
        1

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Reports from Vrije Universiteit Advance Knowledge in Supramolecular Research (Energy transfer in supramolecular calix[4]arene-Perylene bisimide dye light harvesting building blocks: Resolving loss processes with simultaneous target analysis)

2022 DEC 09 (NewsRx) -- By a News Reporter-Staff News Editor at Nanotech Daily -- Fresh data on supramolecular research are presented in a new

Article Description

By the application of simultaneous target analysis of multiple femtosecond transient absorption data sets we have identified two loss channels within multi-chromophoric light harvesting arrays. Perylene bisimide-calix[4]arene arrays composed of up to three different types of perylene bisimide (PBI) chromophores, orange ( o ), red ( r ), and green ( g ) PBIs (named after their colors as solids), have previously been studied by transient absorption spectroscopy (Hippius et al., J. Phys. Chem C 112:2476, 2008) and here we present a simultaneous target analysis of those data matrices. A covalent system containing the red chromophore ( r ) and calix[4]arene ( c ), the rc system, shows extensive spectral evolution that can be described with four excited states ( r1* → r2* → r3* → r4* →ground state). In the Perylene Orange calix[4]arene system ( oc), a radical pair ( oc RP) can be formed by photoinduced electron transfer (Hippius et al., J. Phys. Chem C 111:13988, 2007). In a simultaneous target analysis of the multichromophoric systems ocr, rcocr and ocrco the properties of rc and oc are integrated, and excitation energy transfer (EET) from o* to r* occurs. In addition, we demonstrate that the final Species Associated Difference Spectrum (SADS) also contains o bleach features that indicate an excitonic interaction, for ocr, rcocr and ocrco. In a simultaneous target analysis of rcg and gcrcg the properties of rc are integrated, and next to EET to g* we can resolve the formation of a new rcgRP that is formed from r1* or r2*, and represents a loss of 7 and 12%, respectively. In a simultaneous target analysis of ocrcg the properties of ocr and rcg are integrated, arriving at a consistent picture with an energy transfer quantum yield of formation of the excited state of the green PBI ( g*) of 80%.

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