Regulation of photodynamic interactions in 1,8-naphthalimide–linker–phenothiazine dyads by cyclodextrins

文献情報

出版日 2014-01-10

DOI 10.1039/C3CP54803A

インパクトファクター 3.676

著者

Dae Won Cho, Mamoru Fujitsuka, Akira Sugimoto, Ung Chan Yoon, Dae Won Cho, Tetsuro Majima

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要旨

This study examines the effects of cyclodextrin (CD) on the photophysical properties of 1,8-naphthalimide (NI) derivatives including NI–linker–phenothiazine (NI–L–PTZ) dyads in a H2O/CH3CN solution (v/v = 9 : 1). Peculiar excimer and exciplex emissions were observed with reference NI and NI–L–PTZ, respectively, in an aqueous environment. The NI–CD complexes exhibited monomeric emission spectral features, which resulted from their inclusion into the CD cavity. The complex formation constants of CDs with the NI derivatives were determined. The T1–Tn absorption band of 3NI* was observed at around 470 nm during nanosecond-laser flash photolysis. Photoinduced electron transfer in NI–L–PTZ led to NI˙− and PTZ˙+ from the T1 state. In protic polar solvents, NI˙− easily formed a ketyl radical (NIH˙) by hydrogen abstraction from H2O, and showed a transient absorption band at around 400 nm. The charge recombination (CR) time of the transient species at 400 nm showed a strong CD dependency, and the CR time of the dyad in γ-CD was increased markedly compared with in β-CD. This suggests that the PTZ moiety can also be included in the γ-CD cavity.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

Regulation of photodynamic interactions in 1,8-naphthalimide–linker–phenothiazine dyads by cyclodextrins

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