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Enhanced circularly polarized luminescence of chiral Eu(iii) coordination polymers with structural strain

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Title: Enhanced circularly polarized luminescence of chiral Eu(iii) coordination polymers with structural strain
Authors: Tsurui, Makoto Browse this author
Kitagawa, Yuichi Browse this author →KAKEN DB
Shoji, Sunao Browse this author
Fushimi, Koji Browse this author →KAKEN DB
Hasegawa, Yasuchika Browse this author →KAKEN DB
Issue Date: 21-Jan-2023
Publisher: Royal Society of Chemistry
Journal Title: Dalton transactions
Volume: 52
Issue: 3
Start Page: 796
End Page: 805
Publisher DOI: 10.1039/d2dt03422k
PMID: 36594374
Abstract: Three types of Eu(iii) coordination polymers with different distorted chiral ligands, [Eu(+tfc)(3)(p-dpeb)](n), [Eu(+pfc)(3)(p-dpeb)](n), and [Eu(+hfc)(3)(p-dpeb)](n) (+tfc: (+)-3-(trifluoroacetyl)camphorate, +pfc: (+)-3-(pentafluoropropionyl)camphorate, +hfc: (+)-3-(heptafluorobutyryl)camphorate, p-dpeb: 1,4-bis(diphenylphosphorylethynyl)benzene), were prepared for elucidating the relationship between their structural distortions, ligand-to-metal charge transfer (LMCT), and circularly polarized luminescence (CPL) properties. Their strain factors in the ligands were evaluated using crystallographic data obtained by single-crystal X-ray structural analyses. The characteristics of the LMCT excited states were estimated from theoretical calculations. The introduction of a bulky substituent into the chiral ligand afforded a distorted structure of beta-diketonates and changed the direction of the transition electric dipole moments, which are related to the magnitude of the CPL intensity. The CPL dissymmetry factor (g(CPL)) of [Eu(+hfc)(3)(p-dpeb)](n), with a large distorted structure, was -0.22, while those of [Eu(+tfc)(3)(p-dpeb)](n) and [Eu(+pfc)(3)(p-dpeb)](n), with small distorted structures, were -0.05 and -0.10, respectively. The controlled steric hindrance of the chiral ligands in Eu(iii) coordination polymers is one of the strain factors enhancing their CPL properties.
Type: article (author version)
Appears in Collections:総合化学院 (Graduate School of Chemical Sciences and Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鶴井 真

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