Figure-eight thermal hysteresis of aminomethylenehelicene oligomers with terminal C₁₆ alkyl groups during hetero-double-helix formation.

ABSTRACT: 1 : 1 mixtures of aminomethylenehelicene (P)-tetramer and (M)-pentamer with terminal C₁₆ 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 C₁₆ alkyl groups on the thermodynamic and kinetic phenomena are also

SUBMITTER: Sawato T 

PROVIDER: S-EPMC8157274 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature