Photo-induced charge transfer and nonlinear absorption in dyads composed of a two-photon-absorbing donor and a perylene diimide acceptor
作者:Chun Huang、Matthew M. Sartin、Nisan Siegel、Matteo Cozzuol、Yadong Zhang、Joel M. Hales、Stephen Barlow、Joseph W. Perry、Seth R. Marder
DOI:10.1039/c1jm12566d
日期:——
This paper reports the synthesis and electrochemical and optical properties of two molecular dyads (Dyad 1 and Dyad 2) consisting of a 2,7-bis(4-(diarylamino)styryl)carbazole two-photon-absorbing donor chromophore, connected by different linkers to a perylene diimide (PDI) acceptor. The photo-induced charge transfer in these compounds is characterised using transient absorption measurements. The use of the compounds for optical limiting is discussed; because of spectral overlap between the donor two-photon absorption band and the one-photon absorption band of the PDI radical anion, the dyads exhibit enhanced nonlinear absorption at wavelengths between 700 and 800 nm relative to that seen for the two-photon absorbing donor chromophore. The stronger nonlinear absorption observed for Dyad 1vs.Dyad 2 is attributed to a higher yield of photo-generated radical ions and a longer lived charge-separated state, resulting from differences in the linker between the donor and acceptor.
Efficient generation of singlet oxygen by perylene diimide photosensitizers covalently bound to conjugate polymers
作者:Agata Blacha-Grzechnik、Anna Drewniak、Krzysztof Z. Walczak、Marek Szindler、Przemyslaw Ledwon
DOI:10.1016/j.jphotochem.2019.112161
日期:2020.2
efficient and environmentally stable source of singletoxygen, 1O2, as tested with 1,3-diphenylisobenzofuran (DPBF) specific trap. Additionally, α-terpinene heterogeneous photooxidation was studied as the practical use of singletoxygen generated by this novel PDI-based materials. The use of such heterogeneous source of singletoxygen can be beneficial for the fine chemicals synthesis, due to simplified
合成了以per二酰亚胺(PDI)为侧基的新型共轭聚合物,并通过旋涂法将其沉积在玻璃基板上。由此产生的薄膜通过紫外可见光谱,拉曼光谱,原子力显微镜和轮廓测定法进行了表征。结果表明,PDI光敏剂在共价固定后仍保持其光活性,所形成的层可以用作高效且对环境稳定的单线态氧1 O 2的来源。,已通过1,3-二苯基异苯并呋喃(DPBF)特定捕集阱进行测试。此外,作为这种新型PDI基材料产生的单线态氧的实际应用,对α-萜品烯异质光氧化进行了研究。由于简化了产物的分离和纯化步骤,使用这种多态单线态氧源可能对精细化学品的合成有益。