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Photoinduced electron transfer of poly(o-phenylenediamine)–Rhodamine B copolymer dots: application in ultrasensitive detection of nitrite in vivo
Ist Teil von
Journal of materials chemistry. A, Materials for energy and sustainability, 2015-01, Vol.3 (14), p.7568-7574
Erscheinungsjahr
2015
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
We demonstrate a new semiconducting polymer dot: the poly(
o
-phenylenediamine)–Rhodamine B copolymer dot (Pp–RhB dot), which emits in the red wavelength range. The Pp–RhB dots can be used as an ultrasensitive fluorescence probe for NO
2
−
in vivo
and show high selectivity and ultrasensitivity (detection limit: 2.0 × 10
−11
M) for NO
2
−
. The fluorescence of Pp–RhB dots is decreased (
φ
= 0.014) as a result of fast photoinduced electron transfer (PET) between the modulator (poly(
o
-phenylenediamine)) and the transducer (RhB), but the N–NO
2
bonding mode prevents PET, causing the fluorescence emission to be enhanced (
φ
= 0.92). This probe effectively avoids the influence of auto-fluorescence in biological systems and gave positive results when tested in both aqueous solution and living cells.