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Issue 91, 2015
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pH dependent one-/two-photon fluorescence emission properties and mechanism of the dendrimer PAMAM triphenylamine imine

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Abstract

Dendrimer PTS-G0, based on poly-amidoamine (PAMAM) functionalized by triphenylamine imine (C[double bond, length as m-dash]N), and reference compound ETS, based on ethylenediamine triphenylamine imine, were both synthesized. PTS-G0's one-/two-photon (2PA σ2 = 75 GM) fluorescence emission increased at low pH and remained high at high pH, showing emission ranges that were different from those of NH2- or HO-terminated PAMAM as previously reported. The pH related fluorescence emissions of PTS-G0 and ETS were compared. The emission properties of the independent chemical groups were calculated by quantum chemical theory methods. The imidic acid (HO–C[double bond, length as m-dash]N), imine (C[double bond, length as m-dash]N), and tertiary ammonium groups fluoresce in different pH ranges. The possible fluorescence emission mechanisms of PTS-G0 were discussed, which can help to explain the fluorescence emission of PAMAM and benefit the understanding of intrinsic fluorescence phenomena.

Graphical abstract: pH dependent one-/two-photon fluorescence emission properties and mechanism of the dendrimer PAMAM triphenylamine imine

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Supplementary files

Article information


Submitted
04 Jul 2015
Accepted
25 Aug 2015
First published
25 Aug 2015

RSC Adv., 2015,5, 74940-74946
Article type
Paper
Author version available

pH dependent one-/two-photon fluorescence emission properties and mechanism of the dendrimer PAMAM triphenylamine imine

Y. Ji and Y. Qian, RSC Adv., 2015, 5, 74940
DOI: 10.1039/C5RA13046H

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