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Yasuyaki Araki
Researcher at Tohoku University
Publications - 15
Citations - 663
Yasuyaki Araki is an academic researcher from Tohoku University. The author has contributed to research in topics: Porphyrin & Supramolecular chemistry. The author has an hindex of 13, co-authored 15 publications receiving 655 citations. Previous affiliations of Yasuyaki Araki include Wichita State University.
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Journal ArticleDOI
Supramolecular Triads Formed by Axial Coordination of Fullerene to Covalently Linked Zinc Porphyrin−Ferrocene(s): Design, Syntheses, Electrochemistry, and Photochemistry
Francis D'Souza,Phillip M. Smith,Suresh Gadde,Amy L. McCarty,Michael J. Kullman,Melvin E. Zandler,Mitsunari Itou,Yasuyaki Araki,Osamu Ito +8 more
TL;DR: In this article, photo-induced charge-separation and charge-recombination processes were examined in the dyads and triads by means of time-resolved transient absorption and fluorescence lifetime measurements.
Journal ArticleDOI
Multi-triphenylamine-substituted porphyrin-fullerene conjugates as charge stabilizing "antenna-reaction center" mimics.
Francis D'Souza,Suresh Gadde,D.-M. Shafiqul Islam,Channa A. Wijesinghe,Amy Lea Schumacher,Melvin E. Zandler,Yasuyaki Araki,Osamu Ito +7 more
TL;DR: The present study successfully demonstrates a novel approach of charge-stabilization in donor-acceptor multimodular conjugates and reveals delocalization of the frontier highest occupied molecular orbital (HOMO) over the triphenylamine entities in addition to the porphyrin macrocycle.
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Effect of axial ligation or π-π-type interactions on photochemical charge stabilization in two-point bound supramolecular porphyrin-fullerene conjugates
Francis D'Souza,Raghu Chitta,Suresh Gadde,Melvin E. Zandler,Amy L. McCarty,Atula S. D. Sandanayaka,Yasuyaki Araki,Osamu Ito +7 more
TL;DR: Two types of structurally well-defined, self-assembled zinc porphyrin-fullerene conjugates were formed by "two-point" binding strategies to probe the effect of axial ligation or pi-pi-type interactions on the photochemical charge stabilization in the supramolecular dyads.
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Photosynthetic Reaction Center Mimicry of a “Special Pair” Dimer Linked to Electron Acceptors by a Supramolecular Approach: Self‐Assembled Cofacial Zinc Porphyrin Dimer Complexed with Fullerene(s)
Francis D'Souza,Raghu Chitta,Suresh Gadde,Lisa M. Rogers,Paul A. Karr,Melvin E. Zandler,Atula S. D. Sandanayaka,Yasuyaki Araki,Osamu Ito +8 more
TL;DR: Efficient forward electron transfer from the singlet excited zinc porphyrin dimer to the fullerene entity and relatively slow reverse electron transfer, important steps in the photosynthetic light energy conversion have been achieved in these novel biomimetic model systems.
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Design and studies on supramolecular ferrocene-porphyrin-fullerene constructs for generating long-lived charge separated states.
Francis D'Souza,Raghu Chitta,Suresh Gadde,D-M Shafiqul Islam,Amy Lea Schumacher,Melvin E. Zandler,Yasuyaki Araki,Osamu Ito +7 more
TL;DR: The rates of charge recombination for the second route were found to be an order of magnitude slower than the former route, thus fulfilling the condition for charge migration to generate long-lived charge-separated states in supramolecular systems.