Thermodynamic equilibrium of the transitions between the closed and open forms of a spiropyran-based molecular switch monitored <i>via</i> variable-temperature <sup>1</sup>H NMR spectroscopy
A benzothiazole spiropyran exhibited both photochromic and acid-chromic properties. <i>Via</i> variable-temperature <sup>1</sup>H NMR spectroscopy, the equilibrium constants <i>K</i><sup>ϕ</sup>, Δ<i>H</i><sup>ϕ</sup> and Δ<i>S</i><sup>ϕ</sup> of the ring-closed to ring-opened transition were calculated as <i>ca.</i> 10<sup>-7</sup>, 38.62 kJ mol<sup>-1</sup> and -5.55 J K<sup>-1</sup> mol<sup>-1</sup>, respectively. This is of importance for the application of new spiropyrans.
Authors
- Wangen Miao (ORCID: https://orcid.org/0000-0002-7991-8476)
- Xiaoqin Zhou
- Jingli Liu (ORCID: https://orcid.org/0000-0003-2214-4745)
- Limei Xu (ORCID: https://orcid.org/0000-0002-4648-7577)
Institutions
- Lingnan Normal University (CN)
Publication Details
- Journal
- Physical Chemistry Chemical Physics
- Published
- 2025-01-01
- DOI
- https://doi.org/10.1039/d5cp02235e
- Primary Topic
- Photochromic and Fluorescence Chemistry
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China