Cooperative effects of o - and m -methyl groups on the intramolecular charge-transfer emission properties of dibenzoylmethanatoboron difluorides
| Autor: | Mirai Tanaka, Takuya Ogaki, Kazuhiko Mizuno, Eisuke Ohta, Hiroshi Ikeda, Yasunori Matsui, Shunsuke Muraoka |
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| Rok vydání: | 2017 |
| Předmět: |
010405 organic chemistry
Chemistry Difluoride Charge (physics) Orbital overlap 010402 general chemistry Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences chemistry.chemical_compound Intramolecular force Excited state Molecule Physical and Theoretical Chemistry Derivative (chemistry) |
| Zdroj: | Photochemical & Photobiological Sciences. 16:845-853 |
| ISSN: | 1474-9092 1474-905X |
| Popis: | The photophysical properties of o-tolyl-, m-tolyl-, and p-xylyl-substituted asymmetric diaroylmethanatoboron difluorides in a mixture of CH2Cl2 and c-C6H12, and in the crystalline state were determined. In solution, the fluorescence (FL) properties of these substances are controlled by the position and number of methyl groups on the phenyl rings. An especially interesting finding is that FL from the p-xylyl derivative occurs from an excited state which possesses intramolecular charge-transfer character caused by the o- and m-methyl groups cooperatively. The results of X-ray crystallographic analysis reveal that these asymmetric diaroylmethanatoboron difluorides form dyads through orbital overlap of neighboring molecules. This phenomenon governs the unique FL properties of these substances in the solid state. |
| Databáze: | OpenAIRE |
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