The fluorescence and photochemical properties of crystalline 13-diketonatoboron diflttorides (DBD) RCOCHCORJBF, were studied. These compounds are characterized by relatively high photochemical stability. The introduction of electron-donating groups into the aromatic a-substituent of the chelate ring increases and the introduction of electron-withdrawing groups decreases the fluorescence intensity of DBD. Anisoylbenzoylmethanotoboron difluoride was found to exhibit the highest fluorescence intensity. The substituents were shown to intluence the relative arrangement of singlet and triplet nTt* and m~" levels and luminescence properties of compounds.Key words: boron, ~-diketonates, luminescence.In recent years, there has been a renewed interest in the photophysical and photochemical properties of 13-diketonatoboron difluorides (DBD), promising for use in laser technology, l.z The photophysical properties of solutions of these compounds and the influence of the nature of the solvent on the spectral-luminescence and photophysical parameters of compounds were also described. 3,4Unlike complexes of d-and f-elements, DBD display substantial changes in photophysical characteristics on passing from the crystalline state to solutions, t Data on the photophysical and photochemical properties of crystalline DBD and their structure 5 are quite scarce. The present work reports fluorescence and photochemical properties of crystalline DBD of the composition RCOCHCORIBF2, where R = Me, Ph, Cj0HT, p-MeOC6H4; R I = Me, Ph, CIoH 7. p-MeOC6H4, p-BrC6H 4, m-NO2C6H 4, and p-NO2C6H 4 (Table 1).of full scanning of m/z from 50 to 410 (injector temperature 180 ~ detector temperature 280 ~C. temperature programmed heating from 50 to 280 ~ heating rate 20 K rain -I, ionization energy 70 eV). The luminescence spectra of samples were recorded on an SDL-I spectrometer. A DRSh-250 mercury. lamp served as the source of excitation. The measurements were carried out at 300 K. Photolysis of compounds was performed by exposing the samples in a polyethylene matrix (C = 10 -3 tool L -I) to the nonfiltered light of a DRT-250 mercury. lamp. The light flux intensity ()',excit = 365 nm) measured using a ferrioxalate actinometer was 2.75 9 1015 quantum s-~; the distance from the lamp to the sample was 20 cm.
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