Summary:
A one-pot reaction between Cu(BF4)2·xH2O and 4-mercaptobenzoic acid in acetone or methanol gives rise to the formation of lamellar microcrystals of two Cu(I)-thiophenolate-based coordination polymers (CPs) with the formulas [CuCT] n (1) (CT = 4-carboxy-thiophenolate) and [CuMCT]n (2) (MCT = 4-methoxycarbonyl-thiophenolate). Both 1 and 2 show a reversible luminescent thermochromic behavior upon cooling, changing their color from pale yellow to green to orange in the case of 1, and from pale orange to green in the case of 2. It is shown that the lamellar character of these crystals, which exhibit micrometer lateral dimensions and sub-micrometer/nanometer thicknesses, allows processing them with an organic polymer such as polyvinylidene difluoride (PVDF) to form thermochromic 1@PVDF and 2@PVDF thin films. These thermal stimuli-responsive thin films are freestanding, free of macroscopic defects, and robust under mechanical bending stress, opening up the possibility to use them in, for example, 2D imaging sensor films.
JCR Impact Factor and WoS quartile: 15,621 - Q1 (2018); 18,500 - Q1 (2023)
DOI reference:
https://doi.org/10.1002/adfm.201704040
Published on paper: January 2018.
Published on-line: December 2017.
Citation:
J. Troyano, O. Castillo, J.I. Martínez, V. Fernández-Moreira, Y. Ballesteros, D. Maspoch, F. Zamora, S. Delgado, Reversible thermochromic polymeric thin films made of ultrathin 2D crystals of coordination polymers based on copper(I)-thiophenolates. Advanced Functional Materials. Vol. 28, nº. 5, pp. 1704040-1 - 1704040-11, January 2018. [Online: December 2017]
