TY - JOUR
T1 - Light harvesting a gold porphyrin-zinc phthalocyanine supramolecular donor-acceptor dyad
AU - El-Khouly, Mohamed E.
AU - Fukuzumi, Shunichi
N1 - Funding Information:
This work was supported financially by the Science and Technology Development Fund (STDF), Egypt (Grant Numbers 5537 and 12436) and JSPS (no. 16H02268). The authors thank Dr Atsuro Takai for providing the gold porphyrin sample.
Publisher Copyright:
© The Royal Society of Chemistry and Owner Societies.
PY - 2016
Y1 - 2016
N2 - We reported herein the spectroscopic, electrochemical and laser photolysis studies for the newly constructed light harvesting supramolecular dyad composed of gold porphyrin (AuPpy), as an electron acceptor, and zinc phthalocyanine (ZnPc), as an electron donor, to mimic the reaction centre in the photosynthetic system. For this, gold porphyrin has been functionalized by pyridine units, which axially coordinated with zinc phthalocyanine to form the stable supramolecular AuPpy:ZnPc with a rate of 2.94 × 104 M−1. Steady-state fluorescence measurements showed significant quenching of the singlet excited ZnPc emission with addition of AuPpy, suggesting an electron transfer from the singlet excited ZnPc to AuPpy. The electron transfer character was confirmed by recoding the characteristic absorption band of the zinc phthalocyanine radical cation in the NIR region by a femtosecond laser photolysis technique. The findings that the AuPpy:ZnPc supramolecular dyad exhibits relatively long-lived radical-ion pairs and absorbs light in a wide range of the solar spectrum suggest that it would be useful as a photosynthetic reaction centre.
AB - We reported herein the spectroscopic, electrochemical and laser photolysis studies for the newly constructed light harvesting supramolecular dyad composed of gold porphyrin (AuPpy), as an electron acceptor, and zinc phthalocyanine (ZnPc), as an electron donor, to mimic the reaction centre in the photosynthetic system. For this, gold porphyrin has been functionalized by pyridine units, which axially coordinated with zinc phthalocyanine to form the stable supramolecular AuPpy:ZnPc with a rate of 2.94 × 104 M−1. Steady-state fluorescence measurements showed significant quenching of the singlet excited ZnPc emission with addition of AuPpy, suggesting an electron transfer from the singlet excited ZnPc to AuPpy. The electron transfer character was confirmed by recoding the characteristic absorption band of the zinc phthalocyanine radical cation in the NIR region by a femtosecond laser photolysis technique. The findings that the AuPpy:ZnPc supramolecular dyad exhibits relatively long-lived radical-ion pairs and absorbs light in a wide range of the solar spectrum suggest that it would be useful as a photosynthetic reaction centre.
UR - http://www.scopus.com/inward/record.url?scp=84994462057&partnerID=8YFLogxK
U2 - 10.1039/c6pp00228e
DO - 10.1039/c6pp00228e
M3 - Article
AN - SCOPUS:84994462057
SN - 1474-905X
VL - 15
SP - 1340
EP - 1346
JO - Photochemical and Photobiological Sciences
JF - Photochemical and Photobiological Sciences
IS - 11
ER -