TY - JOUR
T1 - Ruthenium Complexes Bearing Axially Chiral Bipyridyls
T2 - The Mismatched Diastereomer Showed Red Circularly Polarized Phosphorescence
AU - Takaishi, Kazuto
AU - Nakatsuka, Yusuke
AU - Asano, Hitomi
AU - Yamada, Yuya
AU - Ema, Tadashi
N1 - Funding Information:
This work was financially supported by the Hattori Hokokai Foundation and the Okayama Foundation for Science and Technology. We thank Dr. Hiromi Ota (Okayama University) and Dr. Shigeki Mori (Ehime University) for the X-ray analyses. The computations were performed using RCCS, Okazaki, Japan.
Funding Information:
This work was financially supported by the Hattori Hokokai Foundation and the Okayama Foundation for Science and Technology. We thank Dr. Hiromi Ota (Okayama University) and Dr. Shigeki Mori (Ehime University) for the X‐ray analyses. The computations were performed using RCCS, Okazaki, Japan.
Publisher Copyright:
© 2021 Wiley-VCH GmbH
PY - 2022/1/27
Y1 - 2022/1/27
N2 - RutheniumII complexes bearing three axially chiral bipyridyl ligands were synthesized as a new family of chiral complex dyes, and Δ-(S)- and Λ-(S)-diastereomers were obtained. The X-ray crystal structure analyses, spectroscopy, and DFT calculations suggested that all the bipyridyls maintained chirality in both the ground and excited states, and the Δ-(S)- and Λ-(S)-isomers are the matched (more relaxed) and mismatched (more constrained) pairs, respectively. The mismatched Λ-(S)-isomer exhibited red circularly polarized phosphorescence (CPP) both in solution and in the solid state. The solution state CPP is the most intense of ruthenium complexes, while the solid state CPP is the first example of them. It is supposed that, for the Λ-(S)-isomer, the six cumulative CH/π interactions suppress further distortion in the T1 state.
AB - RutheniumII complexes bearing three axially chiral bipyridyl ligands were synthesized as a new family of chiral complex dyes, and Δ-(S)- and Λ-(S)-diastereomers were obtained. The X-ray crystal structure analyses, spectroscopy, and DFT calculations suggested that all the bipyridyls maintained chirality in both the ground and excited states, and the Δ-(S)- and Λ-(S)-isomers are the matched (more relaxed) and mismatched (more constrained) pairs, respectively. The mismatched Λ-(S)-isomer exhibited red circularly polarized phosphorescence (CPP) both in solution and in the solid state. The solution state CPP is the most intense of ruthenium complexes, while the solid state CPP is the first example of them. It is supposed that, for the Λ-(S)-isomer, the six cumulative CH/π interactions suppress further distortion in the T1 state.
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U2 - 10.1002/chem.202104212
DO - 10.1002/chem.202104212
M3 - Article
C2 - 34837262
AN - SCOPUS:85121381887
VL - 28
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
SN - 0947-6539
IS - 6
M1 - e202104212
ER -