Abstract
In this report, we showed the existence of RET induced intermolecular pairing force by comparing their fluorescence behaviors under room illumination vs standing in dark area for either PFluAnt solution or PFluAnt&PFOBT mixture. Their prominent emission attenuation under room illumination brought out the critical role of photo, i.e. RET induced intermolecular pairing force in induction of polymer aggregation. Constant UV-Vis absorption and fluorescence spectra in terms of both peak shapes and maximum wavelengths implied no chemical decomposition was involved. Recoverable fluorescence intensity, fluorescence lifetime as well as NMR spectra further exclude photo induced decomposition. The controllable on/off state of RET induced intermolecular pairing force was verified by the masking effect of outside PFluAnt solution which function as filter to block the excitation of inside PFluAnt and thus off the RET induced intermolecular pairing force. Theoretical calculation suggest that magnitude of RET induced intermolecular pairing force is on the same scale as that of van der Waals interaction. Although the absolute magnitude of RET induced intermolecular pairing force was not tunable, its effect can be magnified by intentionally turn it “on”, which was achieved by irradiance with 5 W desk lamp in this report.
Highlights
Since it was first described over 50 years ago, Förster resonance energy transfer, i.e. fluorescence resonance energy transfer (FRET)[1,2,3,4] has attracted much research attention in both academic and industrial field
The chemical structure as well as UV-Vis absorption and Fluorescence spectra of PFluAnt and PFOBT in THF were shown in Fig. 1(a and b)
Unless specified elsewhere, excitation wavelength of mixture solution was set at 424 nm in order to study the FRET because this is the wavelength corresponding to the absorption maximum for donor polymer PFluAnt
Summary
Since it was first described over 50 years ago, Förster resonance energy transfer, i.e. fluorescence resonance energy transfer (FRET)[1,2,3,4] has attracted much research attention in both academic and industrial field. FRET has been effectively used to investigate the intermolecular interaction due to its sensitivity to intermolecular separation, which in turn is affected by their mutual interaction. FRET was employed as a tool and was described as a process; no attention has been paid to the intermolecular interaction associated with FRET itself[5]. We first unambiguously demonstrated the existence of resonance energy transfer (RET) induced intermolecular pairing force[5]. I.e. PFluAnt and PFOBT were employed in this study and the role of photo, i.e. RET induced intermolecular pairing force, which triggered the polymer aggregation under room illumination, was brought out by their dramatic emission decrease (fluorescence attenuation due to aggregation) of solution under room illumination. The controllability, i.e. scalability of this unraveled intermolecular interaction was investigated
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