Time-Resolved Emission Anisotropy of Anthracene Fluorophore in the Backbone of Stereoregular Poly(methyl methacrylate)

Pokorná, Veronika; Výprachtický, Drahomı́r; Pecka, Jan; Mikeš, František

doi:10.1002/1521-3935(20010101)202:1<155::aid-macp155>3.0.co;2-i

Cited by 6 publications

(7 citation statements)

References 15 publications

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“…Anthracene in MIP environments had fast correlation times of 1.2-2.7 ns, with limiting anisotropy ranging over 0.008-0.025 (Table 2). Pokorná et al measured a correlation time of 2.9-4.7 ns with limiting anisotropy 0.02-0.03 for anthracene in poly(methyl methacrylate) using three different solvents (chloroform, DMF and 1,4dioxane) (20). Kudryasheva et al studied the binding between the anthracene and luciferase and obtained a correlation time of 3.7-7.7 ns with limiting anisotropy of 0.13 for anthracene in water-ethanol solutions in the presence of luciferase (25).…”

Section: Discussionmentioning

confidence: 99%

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Fluorescence anisotropy studies of molecularly imprinted polymers

et al. 2005

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A molecularly imprinted polymer (MIP) is a biomimetic material that can be used as a biochemical sensing element. We studied the steady-state and time-resolved fluorescence and fluorescence anisotropy of anthracene-imprinted polyurethane. We compared MIPs with imprinted analytes present, MIPs with the imprinted analytes extracted, MIPs with rebound analytes, non-imprinted control polymers (non-MIPs) and non-MIPs bound with analytes to understand MIP's binding behaviour. MIPs and non-MIPs had similar steady-state fluorescence anisotropy in the range 0.11-0.24. Anthracene rebound in MIPs and non-MIPs had a fluorescence lifetime of tau = 0.64 ns and a rotational correlation time of phi(F) = 1.2-1.5 ns, both of which were shorter than that of MIPs with imprinted analytes present (tau = 2.03 ns and phi(F) = 2.7 ns). The steady-state anisotropy of polymer solutions increased exponentially with polymerization time and might be used to characterize the polymerization extent in situ.

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Section: Discussionmentioning

confidence: 99%

“…Fluorescence anisotropy has been used to investigate fluorescent molecules in various polymer concentrations or viscosity environments (18)(19)(20)(21), but has not yet been used to characterize MIPs. We studied both…”

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confidence: 99%

Fluorescence anisotropy studies of molecularly imprinted polymers

et al. 2005

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“…A well-known factor leading to emission depolarization is the rotational diffusion of chromophores in solution. [15][16][17] Energy migration between like chromophores can also cause emission dipolarization. 13,18 In this case, the polarized emission of the chromophore has two contributions: one from the original molecules excited by the polarized light, the other from the molecules to which the energy has been transferred.…”

Section: Introductionmentioning

confidence: 99%

Energy Migration Study of Random Immobile Anthracene Derivatives by Time-Resolved Fluorescence Anisotropy Decays

2006

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We describe time-resolved fluorescence anisotropy measurements for a simple 2-substituted anthracene derivative (2-An-M) as a function of concentration in poly(methyl methacrylate) (PMMA) films. The anisotropy decays via energy migration among 2-An-M molecules in the matrix. The data were interpreted in terms of the survival probability of the initially excited chromophores and are in good agreement with the plot predicted using R0 = 1.8 nm, the value of the Förster radius determined independently by the spectral overlap method. For all concentrations, we found r0 = 0.20 +/- 0.01 for the initial anisotropy at time zero, whereas the residual anisotropy, r(infinity), was concentration-dependent and higher in magnitude than the theoretically predicted value, 4% of r0. The higher residual anisotropy values may originate from the possibility that not all of the anthracene molecules are involved in the energy migration process. Similar anthracene anisotropy experiments were performed on anthracene-labeled poly(isoprene-b-methyl methacrylate) (PI-PMMA). The results show an increased depolarization rate for samples containing a higher fraction of polymers labeled at the junction with anthracene chromophores.

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“…This leads the stereocomplexation of stereoregular poly(methyl methacrylate) (PMMA) to be the subject of research for more than 30 years. It was well documented that stereocomplexation can take place in the mixtures of i- and s-PMMA in suitable solvent, in high-temperature annealing, or under supercritical fluid. − Even though countless publications have appeared on dealing with the stereocomplexation of i- and s-PMMA, less attention has been paid to the stereocomplexation process and stereocomplex structures in thin films. To our knowledge, only Schouten et al reported a procedure for producing PMMA monolayer ultrathin film with stereocomplex at the air−water interface under high surface pressure .…”

Section: Introductionmentioning

confidence: 99%