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Figure-eight thermal hysteresis of aminomethylenehelicene oligomers with terminal C(16) alkyl groups during hetero-double-helix formation
1 : 1 mixtures of aminomethylenehelicene (P)-tetramer and (M)-pentamer with terminal C(16) alkyl groups in fluorobenzene showed structural changes between hetero-double-helices B and C and random-coils 2A. Figure-eight thermal hysteresis appeared when the solution was cooled and heated at a constant...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8157274/ https://www.ncbi.nlm.nih.gov/pubmed/34122836 http://dx.doi.org/10.1039/c9sc06496f |
Sumario: | 1 : 1 mixtures of aminomethylenehelicene (P)-tetramer and (M)-pentamer with terminal C(16) alkyl groups in fluorobenzene showed structural changes between hetero-double-helices B and C and random-coils 2A. Figure-eight thermal hysteresis appeared when the solution was cooled and heated at a constant rate and involved the crossing of cooling and heating curves in Δε/temperature profiles. This unusual thermal hysteresis emerged in the intermediate state between counterclockwise and clockwise thermal hystereses. This phenomenon arose from the competition between self-catalytic reactions to form B and C from 2A. Significant effects of terminal C(16) alkyl groups on the thermodynamic and kinetic phenomena are also described. |
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