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Heteroleptic [Bis(oxazoline)](dipyrrinato)zinc(II) Complexes: Bright and Circularly Polarized Luminescence from an Originally Achiral Dipyrrinato Ligand |
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| Authors: | Dr Julius F Kögel Dr Shinpei Kusaka Dr Ryota Sakamoto Toshiki Iwashima Mizuho Tsuchiya Ryojun Toyoda Ryota Matsuoka Dr Takamasa Tsukamoto Dr Junpei Yuasa Prof?Dr Yasutaka Kitagawa Prof?Dr Tsuyoshi Kawai Prof?Dr Hiroshi Nishihara |
| Institution: | 1. Department of Chemistry, Graduate School of Science, The University of Tokyo, Tokyo, Japan;2. JST PRESTO, Kawaguchi, Saitama, Japan;3. Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), Ikoma, Nara, Japan;4. Division of Chemical Engineering, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Osaka, Japan;5. JST CREST, Kawaguchi, Saitama, Japan |
| Abstract: | Heteroleptic zinc(II) complexes synthesized using achiral dipyrrinato and chiral bis(oxazoline) ligands show bright fluorescence with quantum efficiencies of up to 0.70. The fluorescence originates from the 1π–π* photoexcited state localized exclusively on the dipyrrinato ligand. Furthermore, the luminescence is circularly polarized despite the achirality of the dipyrrinato ligand. Single‐crystal X‐ray structure analysis discloses that the chiral bis(oxazoline) ligand undergoes intramolecular π–π stacking with the dipyrrinato ligand, inducing axial chirality in the dipyrrinato moiety. |
| Keywords: | absorption chirality fluorescence N ligands zinc |