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|Type:||Artigo de periódico|
|Title:||A Photophysical Interpretation Of The Thermochromism Of A Polyfluorene Derivative-europium Complex|
|Abstract:||The thermochromism of a polyfluorene derivative complexed with a europium ion was interpreted using the photophysical properties of the noncomplexed polymer and a low molecular mass model compound having the same structure of the complexed site in the polymer. To the naked eye, the thermochromism was characterized by a strong red at low temperatures (170-260 K, due to Eu3+ ion) and a blue color at higher ones (280-330 K, due to fluorene). Absorption and emission spectra, time-resolved measurements, and theoretical simulations showed that the polymer chain does not affect the europium photophysical properties, but the opposite occurred: the ion insertion precluded interchain aggregation, and the backbone emission did not vary with temperature variation, in the range of 170-330 K. To the best of our knowledge, this effect is reported for the first time and opened a new avenue for the design of nanothermometers, since the polymer can act as a built-in standard, thus allowing the construction of much simpler devices.|
|Editor:||American Chemical Society|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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