A Photophysical Interpretation of the Thermochromism of a Polyfluorene Derivative-Europium Complex

作者：Turchetti Denis A; Domingues Raquel A; Zanlorenzi Cristiano; Nowacki Bruno; Atvars Teresa D Z; Akcelrud Leni C^*

来源：Journal of Physical Chemistry C, 2014, 118(51): 30079-30086.

DOI：10.1021/jp508136q

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.

• 出版日期2014-12-25