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Synergistic regulation of nonbinary molecular switches by protonation and light.
- Source :
-
Proceedings of the National Academy of Sciences of the United States of America . 11/23/2021, Vol. 118 Issue 47, p1-10. 10p. - Publication Year :
- 2021
-
Abstract
- We report a molecular switching ensemble whose states may be regulated in synergistic fashion by both protonation and photoirradiation. This allows hierarchical control in both a kinetic and thermodynamic sense. These pseudorotaxane-based molecular devices exploit the so-called Texas-sized molecular box (cyclo[2]-(2,6-di(1Himidazol- 1-yl)pyridine)[2](1,4-dimethylenebenzene); 14+, studied as its tetrakis-PF6 2 salt) as the wheel component. Anions of azobenzene- 4,40-dicarboxylic acid (2H+•2) or 4,40-stilbenedicarboxylic acid (2H+•3) serve as the threading rod elements. The various forms of 2 and 3 (neutral, monoprotonated, and diprotonated) interact differently with 14+, as do the photoinduced cis or trans forms of these classic photoactive guests. The net result is a multimodal molecular switch that can be regulated in synergistic fashion through protonation/deprotonation and photoirradiation. The degree of guest protonation is the dominating control factor, with light acting as a secondary regulatory stimulus. The present dual input strategy provides a complement to more traditional orthogonal stimulus-based approaches to molecular switching and allows for the creation of nonbinary stimulus-responsive functional materials. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MOLECULAR switches
*PROTON transfer reactions
*KINETIC control
Subjects
Details
- Language :
- English
- ISSN :
- 00278424
- Volume :
- 118
- Issue :
- 47
- Database :
- Academic Search Index
- Journal :
- Proceedings of the National Academy of Sciences of the United States of America
- Publication Type :
- Academic Journal
- Accession number :
- 153913979
- Full Text :
- https://doi.org/10.1073/pnas.2112973118