ArticleBeilstein journal of organic chemistry2019
Probing of local polarity in poly(methyl methacrylate) with the charge transfer transition in Nile red.
Article in Beilstein journal of organic chemistry, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed, 16 citations in OpenAlex.
- Charge-transfer dynamics in bowl-shaped imide-functionalized corannulenes at ensemble and single-molecule levels.Chemical science · 2026Article
- Molecular Origins of the Optical Response of Nile Red in Model Aerosol Aqueous Ionic Environments.The journal of physical chemistry. A · 2026Article
- Unveiling the fluorescence lifetime changes of a solvatochromic aurone probe dye upon wetting in an emissive polymer brush matrix by deconvolution of TCSPC data.The European physical journal. E, Soft matter · 2026Article
- In Situ Fluorescent Illumination of Microplastics in Water Utilizing a Combination of Dye/Surfactant and Quenching Techniques.Polymers · 2022Article
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
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Abstract
The permittivity of polymers and its spatial distribution play a crucial role in the behavior of thin films, such as those used, e.g., as sensor coatings. In an attempt to develop a conclusive approach to determine these quantities, the polarity of the model polymer poly(methyl methacrylate) (PMMA) in 600 nm thin films on a glass support was probed by the energy of the charge transfer transition in the oxazine dye Nile red (NR) at 25 °C. The absorption and fluorescence spectra of NR were observed to shift to the red with increasing solvent polarity, because of the intramolecular charge transfer character of the optical transition. New types of solvatochromic plots of emission frequency against absorption frequency and vice versa afforded the Onsager radius-free estimation of the ground and excited states dipole moment ratio. With this approach the values of these dipole moments of 11.97 D and 18.30-19.16 D, respectively, were obtained for NR. An effective local dielectric constant of 5.9-8.3 for PMMA thin films was calculated from the solvatochromic plot and the fluorescence maximum of NR observed in the PMMA films. The fluorescence band of NR in the rigid PMMA films shifted to the red by 130 cm
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