Affiliation:
1. State Key Laboratory of Fine Chemicals Frontiers Science Centre for Smart Materials School of Chemical Engineering Dalian University of Technology 2 Ling-Gong Road Dalian 116024 P. R. China
2. College of Chemistry Beijing Normal University Beijing 100875 P. R. China
Abstract
AbstractWe prepared a N^N Pt(II) bisacetylide complex that has strong absorption of visible light (molar absorption coefficients ϵ=6.7×104 M−1 cm−1 at 570 nm), and the singlet oxygen quantum yield (ΦΔ) is up to 78 %. Femtosecond transient absorption spectra show the intersystem crossing (ISC) of the complex takes 81.8 ps, nanosecond transient absorption spectra show the triplet excited state lifetime is 7.6 μs. Density functional theory (DFT) computation demonstrated that the S1 and T1 states are mainly localized on the perylenemonoimide (PMI) ligands, although the involvement of the Pt(II) centre is noticeable. The complex was used as triplet photosensitizer to generate delayed fluorescence with perylenebisimide (PBI) as the triplet state energy acceptor and emitter, via the intermolecular triplet‐triplet energy transfer (TTET) and triplet‐triplet annihilation (TTA), the delayed fluorescence lifetime is up to 52.5 μs under the experimental conditions.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities