Photoelectron ejection from the dianion of pentabenzotriazasmaragdyrin (PBTAS) which is an expanded phthalocyanine, is observed using femtosecond transient absorption spectroscopy. The PBTAS dianion was produced by chemical reduction using excess cobaltocene as a reductant, which was confirmed by their steady-state absorption spectrum as compared to the absorption spectrum obtained by electrochemical reduction, and characterized by magnetic circular dichroism (MCD). Upon photoexcitation of the PBTASdianion, the generation of a radical anion was confirmed by the characteristic absorption peaks that are observed at 950 and 1000 nm. The radical anion was relaxed to form a dianion with a time constant of 0.7 ps.
Bibliographical noteFunding Information:
The work at Yonsei University was financially supported by Global Research Laboratory (2013K1A1A2A020-50183) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT (Information and Communication Technologies) and Future Planning. The work in Japan was financially supported by a JSPS KAKENHI Grant (No. 15K05409), The Murata Science Foundation, and partially supported by a bilateral program between the Japan Society for the Promotion of Science (JSPS) and National Research Foundation (NRF) of South Africa (uid: 92425). The quantum calculations were performed using the supercomputing resources of the Korea Institute of Science and Technology Information (KISTI).
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