TY - JOUR
T1 - Blue fluorescence from
T2 - N, O -coordinated BF2 complexes having aromatic chromophores in solution and the solid state
AU - Yamaji, Minoru
AU - Tomonari, Kazuhiro
AU - Ikuma, Keisuke
AU - Goto, Kenta
AU - Tani, Fumito
AU - Okamoto, Hideki
N1 - Funding Information:
This work has been supported by a Grant-in-Aid for Scientific Research (JP26288032, JP17K05976 and JP18H02043) from the Japan Society for the Promotion of Science (JSPS) to MY and HO. MY acknowledges the technical staff at Kyushu University for performing the HRMS spectrometry of the new compounds under a Cooperative Research Program of the Network Joint Research Center for Materials and Devices. Hamamatsu Photonics K.K. is acknowledged for allowing MY to use the photon counting system (C11367).
Publisher Copyright:
© 2019 The Royal Society of Chemistry and Owner Societies.
PY - 2019
Y1 - 2019
N2 - We prepared amide-heterocycle (HC) compounds having various aromatic π-electron systems (Ar), such as phenyl, naphthyl, furyl, thienyl and phenanthryl moieties, and converted them as ligands to difluoroboronated complexes, Ar@HCs. Blue fluorescence from Ar@HCs was observed in solution and the solid state, and the fluorescence quantum yields (Φf) and lifetimes (τf) were determined. The Φf values in CHCl3 were as small as 0.1 except for the phenanthrene derivatives (0.4-0.6). Observation of the triplet-triplet absorption upon laser flash photolysis of Ar@HCs in solution indicated that the fluorescence process competes with intersystem crossing to the triplet state. Blue fluorescence in the solid state was observed with the Φf values of 0.3-0.7. Based on the crystallographic data, the relationship between the crystal structures and emission features of Ar@HCs in the solid state is discussed.
AB - We prepared amide-heterocycle (HC) compounds having various aromatic π-electron systems (Ar), such as phenyl, naphthyl, furyl, thienyl and phenanthryl moieties, and converted them as ligands to difluoroboronated complexes, Ar@HCs. Blue fluorescence from Ar@HCs was observed in solution and the solid state, and the fluorescence quantum yields (Φf) and lifetimes (τf) were determined. The Φf values in CHCl3 were as small as 0.1 except for the phenanthrene derivatives (0.4-0.6). Observation of the triplet-triplet absorption upon laser flash photolysis of Ar@HCs in solution indicated that the fluorescence process competes with intersystem crossing to the triplet state. Blue fluorescence in the solid state was observed with the Φf values of 0.3-0.7. Based on the crystallographic data, the relationship between the crystal structures and emission features of Ar@HCs in the solid state is discussed.
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U2 - 10.1039/c9pp00410f
DO - 10.1039/c9pp00410f
M3 - Article
C2 - 31774106
AN - SCOPUS:85076064523
VL - 18
SP - 2884
EP - 2892
JO - Photochemical and Photobiological Sciences
JF - Photochemical and Photobiological Sciences
SN - 1474-905X
IS - 12
ER -