Synthesis of novel silica encapsulated spiropyran-based thermochromic materials.
| Autor: | Iqbal A; Nanoscience and Technology Department, National Center for Physics, PO Box No 2141, Islamabad 44000, Pakistan., Iqbal G; Department of Pharmacy, Kohat University of Science and Technology, (KUST), Kohat, KP, Pakistan., Umar MN; Department of Chemistry, University of Malakand, Chakdara Dir (L), KP, Pakistan., Ur Rashid H; Institute of Chemistry, Federal University of Mato Grosso do Sul, Campo Grande, MS, Brazil., Khan SW; Department of Chemistry, Shaheed Benazir Bhutto University, Sheringal, Upper Dir, KP, Pakistan. |
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| Jazyk: | angličtina |
| Zdroj: | Royal Society open science [R Soc Open Sci] 2022 Mar 02; Vol. 9 (3), pp. 211385. Date of Electronic Publication: 2022 Mar 02 (Print Publication: 2022). |
| DOI: | 10.1098/rsos.211385 |
| Abstrakt: | A series of novel spiropyrans were synthesized through the condensation of substituted 3,3-dimethyl-2-methyleneindoline with different nitro-substituted o -hydroxy aromatic aldehydes. Indoles were initially substituted with a variety of alkanes and esters moieties. The substituted 3,3-dimethyl-2-methyleneindoline was then reacted with nitro-substituted o -hydroxy aromatic aldehydes to yield the respective spiropyrans. The synthesized novel spiropyrans were encapsulated in silica nano-shells to protect them from the effect of moisture and pH. The thermochromic behaviour of novel spiropyrans was studied by UV-visible spectroscopy. The thermally induced isomerization of spiropyran derivatives was carried out in a water/ethanol mixture. The thermal isomerization of spiro-heterocyclic (colourless form) to merocyanine (MC) (coloured form) was a discontinuous process and was observed in a temperature range of 5-60°C via UV-visible spectrometer. The absorption process occurs reversibly regardless of the heating/cooling sequence. The spiropyran derivatives, therefore, have a potential application for colorimetric temperature indication. Competing Interests: The authors declare that they have no conflict of interest. (© 2022 The Authors.) |
| Databáze: | MEDLINE |
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