Structural phase transitions and phosphorescence spectra in benzophenone

In this paper we present the results of the detailed investigation of the p hase transitions in benzophenone by applying differential scanning calorime try. For the first time the full picture concerning all phase transitions w hich occur in benzophenone in the temperature range from 143 to 353 K was o btained. A new crystal modification gamma with melting point at 295.4 K has been found. Also the photoluminescence of each modification of benzophenon e and the temperature dependences of their emission intensity have been inv estigated. The peculiarities observed in the emission of the beta -modifica tion have been connected with the existence of this new gamma -modification . (C) 2000 Elsevier Science B.V. All rights reserved.