Effect of Mechanochemical Recrystallization on the Thermal Hysteresis of 1D Fe-triazole Spin Crossover Polymers.

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ID: 105088
2020
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Abstract
The thermal hysteresis in the cooperative spin crossover (SCO) polymer [Fe(trz)(Htrz)][BF] () has been tuned by a simple ball milling grinding process. Mechanical treatment affects the size and morphology of the crystallite domains, as confirmed by multiple complementary techniques, including ESEM, DLS, and PXRD data. Upon milling, the regular cubic shape particles recrystallize with slightly different unit cell parameters and preferential orientation. This macroscopic change significantly modifies the thermally induced SCO behavior, studied by temperature-dependent magnetic susceptibility, X-ray diffraction, and DSC analysis. Transition temperatures downshift, closer to room temperature, while hysteresis widens, when particle sizes are actually decreasing. We relate this counterintuitive observation to subtle modifications in the unit cell, offering new alternatives to tune and enhance SCO properties in this class of 1D-cooperative polymers.
Reference Key
nietocastro2020effectinorganic Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Nieto-Castro, David;Garcés-Pineda, Felipe A;Moneo-Corcuera, Andrea;Pato-Doldan, Breogán;Gispert-Guirado, Francesc;Benet-Buchholz, Jordi;Galán-Mascarós, José Ramón;
Journal Inorganic chemistry
Year 2020
DOI
10.1021/acs.inorgchem.9b03284
URL
Keywords
biological activity anti-tumor antivirus immune regulation structural modification degradation modification graft modification

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