@article{d7932303d4bc4522937b43c9f733fed4,
title = "Synthesis of isomeric coumarin-fluorene hybrids by photocyclization and the photophysical features",
abstract = "We prepared isomeric compounds 2a and 2b having fused skeletons of coumarin and fluorene by photochemical cyclization of olefin 1. They were successfully separated by chromatography, and characterized by NMR spectroscopic and X-ray crystallographic analyses. The molecular structure of 2a was nonplanar due to the repulsion between the carbonyl group of the coumarin moiety and the methylene group at 9-position on the fluorene skeleton whilst that of 2b was planar. They showed different absorption and fluorescence features in solution whereas their spectral profiles of triplet–triplet absorption and phosphorescence were similar to each other.",
keywords = "Coumarin, Fluorene, Fluorescence lifetime, Fluorescence quantum yield, Photocyclization",
author = "Minoru Yamaji and Hideki Okamoto and Kenta Goto and Kato, {Shin ichiro} and Fumito Tani and Yosuke Nakamura",
note = "Funding Information: This work has been supported by a Grant-in-Aid for Scientific Research ( JP26288032 and JP17K0597621 ) from JSPS to MY and HO, respectively. MY acknowledges the technical staff at Kyushu University for performing the HRMS spectrometry of the new compounds under Cooperative Research Program of the Network Joint Research Center for Materials and Devices. MY is grateful to the association for theadvancement of Science & Technology, Gunma University for financial support. A Funding Information: This work has been supported by a Grant-in-Aid for Scientific Research (JP26288032 and JP17K0597621) from JSPS to MY and HO, respectively. MY acknowledges the technical staff at Kyushu University for performing the HRMS spectrometry of the new compounds under Cooperative Research Program of the Network Joint Research Center for Materials and Devices. MY is grateful to the association for theadvancement of Science & Technology, Gunma University for financial support. Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",
year = "2018",
month = mar,
day = "28",
doi = "10.1016/j.tetlet.2018.02.033",
language = "English",
volume = "59",
pages = "1216--1219",
journal = "Tetrahedron Letters",
issn = "0040-4039",
publisher = "Elsevier Limited",
number = "13",
}