Unusual Alternating Crystallization-Induced Emission Enhancement Behavior in Nonconjugated ω-Phenylalkyl Tropylium Salts
| Autor: | Domenic P. Pace, Reece D. Crocker, Wallace W. H. Wong, Demelza J. M. Lyons, Mohan M. Bhadbhade, Binh Khanh Mai, Thanh Vinh Nguyen, Bolong Zhang |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
010405 organic chemistry Dimer Quantum yield General Chemistry 010402 general chemistry 01 natural sciences Biochemistry Catalysis 0104 chemical sciences law.invention chemistry.chemical_compound Crystallography Colloid and Surface Chemistry chemistry law Ab initio quantum chemistry methods Ionic liquid Melting point Molecule Crystallization Alkyl |
| Zdroj: | Journal of the American Chemical Society. 143(48) |
| ISSN: | 1520-5126 |
| Popis: | The alternating physical properties, especially melting points, of α,ω-disubstituted n-alkanes and their parent n-alkanes had been known since Baeyer's report in 1877. There is, however, no general and comprehensive explanation for such a phenomenon. Herein, we report the synthesis and examination of a series of novel ω-phenyl n-alkyl tropylium tetrafluoroborates, which also display alternation in their physicochemical characters. Despite being organic salts, the compounds with odd numbers of carbons in the alkyl bridge exist as room temperature ionic liquids. In stark contrast to this, the analogues with even numbers of carbons in the linker are crystalline solids. These solid nonconjugated molecules exhibit curious photoluminescent properties, which can be attributed to their ability to form through-space charge-transfer complexes to cause crystallization-induced emission enhancement. Most notably, the compound with the highest photoluminescent quantum yield in this series showed an unusual arrangement of carbocationic dimer in the solid state. A combination of XRD analysis and ab initio calculations revealed interesting insights into these systems. |
| Databáze: | OpenAIRE |
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