Excited and ionic states of polymers with pendant phenanthryl groups in solution. Model systems for photophysics in phenanthrene aggregates

Naoto Tamai, Hiroshi Masuhara*, Noboru Mataga

*此作品的通信作者

研究成果: Article同行評審

22 引文 斯高帕斯(Scopus)

摘要

Using N2 gas laser and picosecond Nd3+:YAG laser photolysis systems, we measured the transient absorption spectra of 9-ethylphenanthrene (EPh), 1,3-di-(9-phenanthryl)propane (DPhP), poly[2-(9-phenanthryl)ethyl vinyl ether] (PPhEVE), and poly(9-vinylphenanthrene) (PVPh) in solution. The Sn ← S1 absorption spectrum is almost common to the present compounds, indicating a very weak interchromophore interaction in the excited singlet state. The absorption spectrum of the triplet and cationic states changes from compound to compound, while the spectra of their anion radicals are identical. The triplet excitation and the positive hole can be stabilized easily by forming excimer and dimer cation, respectively, whose conformations are discussed in detail. In the case of polymer systems, plural dimer sites with different geometries exist, which is due to the stacking effect of chromophores. On the other hand, the negative charge is always trapped as a monomer anion. On the basis of the present results, the photophysics of phenanthrene aggregates is discussed.

原文English
頁(從 - 到)4461-4467
頁數7
期刊Journal of Physical Chemistry
87
發行號22
DOIs
出版狀態Published - 1 1月 1983

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