Growth and Energy Transfer of Newly Discovered Fluorescence in Polystyrene Fine Particles

Kuo, Alex

doi:10.5618/chem.2011.v1.n1.6

Cited by 3 publications

(11 citation statements)

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“…In general, the excited multi-mers leading to the fluorescence emissions at longer wavelengths could be formed in similar pathways as excimers described above but no studies were reported to my knowledge. It was proposed that in polystyrene fine particles, the fluorescence emissions at 347 and 365 nm are from the excited phenyl trimers, while the emissions at 383, 404, and 426 nm are emit by the excited phenyl tetramers [10]. In the studied polystyrene solutions in this work, the fluorescence emissions covered the 347 and 365 nm region (trimers) are the region exhibited fine structures at the excitation energies of 277 nm (Fig.…”

Section: Resultsmentioning

confidence: 62%

“…In the studied polystyrene solutions, however, the maximum absorption band is around 309 nm, a wavelength that is between the absorption centers of the least stable proposed dimer (302 nm) and the most stable proposed trimer (325 nm) in polystyrene fine http://ccaasmag.org/CHEM particles [10]. No structures are proposed for the absorption band centered around 309 nm in polystyrene fine particles [10], however, as shown in Fig.16 of energy transfer diagram [10], this absorption band have relative weak contribution to the emissions centered around 347, 365, 383, and 404 nm in polystyrene fine particles that are proposed to be emit from the excited phenyl trimers (347 and 365) and phenyl tetramers (383 and 404), respectively. Therefore the absorption band centered at 309 nm in solution possibly belongs to phenyl trimer(s).…”

Section: Fluorescence Excitation Spectramentioning

confidence: 96%

“…However in the polystyrene fine particle, the contribution from the absorption band centered at 340 nm is the greatest while the contributions from other absorption bands ranging from 270 nm to 380 nm are similar. It was proposed that in polystyrene fine particles, the absorption bands centered at 278, 282, 285, 292, 296 and 302 nm are caused by the phenyl dimers, the absorption peaks centered at 325, 332, 340, and 347 nm are from the phenyl trimers, while the absorption peaks at 360 and 380 nm are belong to the phenyl tetramers [10]. In the studied polystyrene solutions, however, the maximum absorption band is around 309 nm, a wavelength that is between the absorption centers of the least stable proposed dimer (302 nm) and the most stable proposed trimer (325 nm) in polystyrene fine http://ccaasmag.org/CHEM particles [10].…”

Section: Fluorescence Excitation Spectramentioning

confidence: 99%

“…It was proposed that in polystyrene fine particles, the absorption bands centered at 278, 282, 285, 292, 296 and 302 nm are caused by the phenyl dimers, the absorption peaks centered at 325, 332, 340, and 347 nm are from the phenyl trimers, while the absorption peaks at 360 and 380 nm are belong to the phenyl tetramers [10]. In the studied polystyrene solutions, however, the maximum absorption band is around 309 nm, a wavelength that is between the absorption centers of the least stable proposed dimer (302 nm) and the most stable proposed trimer (325 nm) in polystyrene fine http://ccaasmag.org/CHEM particles [10]. No structures are proposed for the absorption band centered around 309 nm in polystyrene fine particles [10], however, as shown in Fig.16 of energy transfer diagram [10], this absorption band have relative weak contribution to the emissions centered around 347, 365, 383, and 404 nm in polystyrene fine particles that are proposed to be emit from the excited phenyl trimers (347 and 365) and phenyl tetramers (383 and 404), respectively.…”

Section: Fluorescence Excitation Spectramentioning

confidence: 99%

“…The detailed information about the growth of these new emissions in polystyrene fine particles under ambient conditions and vacuum have also been discussed and documented [10], as well as the energy transfer between different phenyl chromophores: monomers, dimers and multimers. This work reports that similar fluorescent phenomena occured in long wavelengths as discovered in polystyrene fine particles and cast film can be also observed in polystyrene solutions.…”

Section: Introductionmentioning

confidence: 99%

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Fluorescence Resulting from π-stacking in Polystyrene Solutions

Kuo¹

2011

CheM

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The fluorescence of polystyrenes solutions are reported in three different concentrations with one in semi-diluted regime and two in diluted regime. With the excitation energy of 260 nm, only the widely studied monomer fluorescence emission near 285 nm and excimer fluorescence emission near 330 nm are observed. With the excitation energies at 277nm and longer wavelengths, the unexpected emissions in the longer wavelength range 350-480 nm that was recently discovered in polystyrene fine particles are also found to appear in polystyrene solutions, but with fewer structures and major peaks in different wavelengths. The major emissions shift from the region of 320-390 nm in polystyrene fine particles to the region of 380-450 nm in solutions. The excitation spectrum of the emissions at longer wavelength reveals much broader absorption bands with fewer resolved structures in polystyrene solutions than the absorption bands recorded in fine particles. Considering the simplicity of polystyrene molecules and previous studies, aromatic-aromatic (or π-stacking) interactions are believed to be the major driving forces for the formation of phenyl dimers and multimers from which the new emissions in longer wavelengths originate. The mechanism of the formation of these phenyl multimers in polystyrene solutions remains unsolved in this study, however the new fluorescence emissions discovered will contribute to the study of π-stacking interactions, and can also be a powerful probe for monitoring molecular motions and ordered structures of polystyrene molecules or other aromatic macromolecules in solutions.

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Section: Resultsmentioning

confidence: 62%

Section: Fluorescence Excitation Spectramentioning

confidence: 96%

Section: Fluorescence Excitation Spectramentioning

confidence: 99%

Section: Fluorescence Excitation Spectramentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fluorescence Resulting from π-stacking in Polystyrene Solutions

Kuo¹

2011

CheM

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Self-reporting and refoldable profluorescent single-chain nanoparticles

Fischer

Spann

et al. 2018

Chem. Sci.

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Temperature Perturbation to Intrinsic Fluorescence of Phenyl Multimers in Glassy Polystyrene

Wong¹

2012

CheM

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The newly discovered fluorescence in polystyrene is used as a probe to understand the phenyl motions in glassy polystyrene fine particles when temperature increases from room temperature to 62°C. The large changes in fluorescence profiles (intensities and shapes) suggest profound phenyl motions and reorientations under 62°C. When excite a single phenyl ring (λ ex = 260 nm), proposed phenyl dimers (λ ex = 277 nm and 296 nm), and proposed tetramers (λ ex = 360 nm and 380 nm), the heating has negative effects on the fluorescence intensities of all emissions, while the heating exhibits positive effects on the fluorescence emissions when excite proposed trimers (λ ex = 325 nm and 340 nm). This implies that the phenyl motions and reorientations under 62°C in the studied time frame are in the direction of favoring the formations of proposed phenyl trimers, at the cost of proposed phenyl dimers and tetramers. With continuous heating under 62 °C, the emissions at λ ex = 277 nm showed different responses to the heat in its shorter wavelength region (350-367 nm) from its longer wavelength regions (374-426 nm), which is believed to be caused by the larger and increasing contributions of emissions from excited trimers (λ ex =340 nm) to the emissions at its longer wavelength side, through either indirect excitation of phenyl trimers by energy transfer or formation of excited trimers from some excited dimers, or both.

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Growth and Energy Transfer of Newly Discovered Fluorescence in Polystyrene Fine Particles

Cited by 3 publications

References 4 publications

Fluorescence Resulting from π-stacking in Polystyrene Solutions

Fluorescence Resulting from π-stacking in Polystyrene Solutions

Self-reporting and refoldable profluorescent single-chain nanoparticles

Temperature Perturbation to Intrinsic Fluorescence of Phenyl Multimers in Glassy Polystyrene

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