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• W1990584879 abstract "The low-temperature phase transition (−22.4 °C) is accompanied by marked change of the optical properties, as was first revealed for 3-phenylthiopentan-2,4-dionatoboron difluoride (1) in the series of β-diketonatoboron difluorides. This transition was investigated by luminescence and reflection spectroscopy, differential scanning calorimetry (DSL), X-ray analysis and atomic force microscopy methods. It was observed by the DSL method that at the room temperature the complex existed in its high-temperature modification and transformed into the stable one with ΔH=0.981 kcal/mol below −22.4 °C. The reverse transition takes place at 43.4 °C with ΔH=0.59 kcal/mol. Cooling of 1 results in a noticeable change of its morphology: the crystal cracked along the layer borders and nanometer particles were formed. Having been cooled the light-yellow crystals turned into white powder and luminescence colour changed from aquamarine to white. Heating of the cooled 1 to the 47.9 °C (the second phase transition) results in partial coincidence of the reflection and luminescence spectra, as well as those of initial single crystals that indicates the existence of size-dependent optic properties." @default.
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• W1990584879 date "2008-11-01" @default.
• W1990584879 modified "2023-09-27" @default.
• W1990584879 title "Reversible luminescence thermochromism and phase transition in crystals of thiophenylacetylacetonatoboron difluoride" @default.
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• W1990584879 doi "https://doi.org/10.1016/j.jlumin.2008.04.016" @default.
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