Dinuclear Triple‐Stranded Helicates Composed of Tetradentate Ligands with Aluminum(III) Chromophores: Optical Resolution and Multi‐color Circularly Polarized Luminescence Properties
| Autor: | Toshikazu Ono, Masashi Hasegawa, Takunori Harada, Kiyonao Furusho, Kohei Ishihama, Masaaki Abe, Yuki Nojima, Yoshio Hisaeda, Ai Taema |
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| Rok vydání: | 2020 |
| Předmět: |
Circular dichroism
Photoluminescence Materials science 010405 organic chemistry Cyan chemistry.chemical_element General Medicine General Chemistry Chromophore 010402 general chemistry 01 natural sciences Catalysis 0104 chemical sciences Ion Crystallography chemistry Aluminium Luminescence Racemization |
| Zdroj: | Angewandte Chemie International Edition. 60:2614-2618 |
| ISSN: | 1521-3773 1433-7851 |
| Popis: | New chiroptical chromophores, dinuclear triple-stranded helicates, composed of tetradentate ligands with aluminum(III) ions, are described. These are synthesized in two steps using inexpensive pyrrole derivatives, hydrazine, and aluminum chloride. These molecular architectures (ALPHY) show multi-color (cyan, yellow, and orange) photoluminescence in solution and in the solid-state, which depends on the substituents of the ligands. The photoluminescence quantum yields of helicates were up to 54 %. The right-handed (P) and left-handed (M) helicates are so stable that they do not undergo racemization in some solvents and are mirror images according to circular dichroism and circularly polarized luminescence (CPL) with an absolute luminescence dissymmetry factor (glum ) of up to the 10-3 order. Mixing the different helicates produces white-light emission with CPL characters. This study offers a glimpse into the potential applications of chromophores with diverse photophysical properties. |
| Databáze: | OpenAIRE |
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