Spectrochim Acta A Mol Biomol Spectrosc 2021 Jun 29;262:120114. Epub 2021 Jun 29.
Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences Department, Prosp. 100 letiya Vladivostoka, 159, Vladivostok, Russian Federation.
A comparative study of the luminescence properties and crystal structure of boron difluoride 1-(anthracen-9-yl)butane-1,3-dionate (1) and their nitrogen-containing analogs with hydrogen and methyl substituents (2 and 3) has been performed. For boron difluoride beta-diketonate (1) and beta-ketoiminate with a hydrogen substituent (2), which does not create significant steric difficulties, the luminescence of crystals is determined by that of excimers and aggregates based on them. For the compounds 1-3, mechanofluorochromism has been observed, the spectral manifestation of which is different: at grinding the crystals of 1 and 2, a hypsochromic shift of the excitation and luminescence bands occurs, whereas in the case of crystals of 3, a bathochromic shift takes place. Read More