Charge Transport in Photofunctional Nanoparticles Self-Assembled from Zinc 5,10,15,20-Tetrakis(perylenediimide)porphyrin Building Blocks

Citations Over TimeTop 1% of 2002 papers

Abstract

Molecules designed to carry out photochemical energy conversion typically employ several sequential electron transfers, as do photosynthetic proteins. Yet, these molecules typically do not achieve the extensive charge transport characteristic of semiconductor devices. We have prepared a large molecule in which four perylene-3,4:9,10-tetracarboxydiimide (PDI) molecules that both collect photons and accept electrons are attached to a central zinc 5,10,15,20-tetraphenylporphyrin (ZnTPP) electron donor. This molecule self-assembles into ordered nanoparticles both in solution and in the solid-state, driven by van der Waals stacking of the PDI molecules. Photoexcitation of the nanoparticles results in quantitative charge separation in 3.2 ps to form ZnTPP(+)PDI(-) radical ion pairs, in which the radical anion rapidly migrates to PDI molecules that are, on average, 21 A away, as evidenced by magnetic field effects on the yield of the PDI triplet state that results from radical ion pair recombination. These nanoparticles exhibit charge transport properties that combine important features from both photosynthetic and semiconductor photoconversion systems.

Related Papers

• → Photoinduced Charge Separation Reactions of J-Aggregates Coated on Silver Nanoparticles(2002)116 cited
• → Improving the Photoinduced Charge Separation Parameters in Corrole–Perylene Carboximide Dyads by Tuning the Redox and Spectroscopic Properties of the Components(2012)24 cited
• → Long-lived photoinduced charge separation in a redox system trapped in a sol–gel glass(1992)125 cited
• → Photoinduced excimer generation in perylene diimide dimer: effects of solvent polarity [Invited](2022)3 cited
• → Infrared Photoexcitation Spectroscopy of Conducting Polymer and C₆₀ Composites: Direct Evidence of Photo-Induced Electron Transfer(1994)5 cited