ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

The Efficiency of Transformation of Electronic Energy to Heat for Derivatives of 2-Hydroxybenzophenone as Studied by Laser-Induced Opto-Acoustic Spectroscopy

P. Hrdlovič

Polymer Institute, Slovak Academy of Sciences, SK-842 36 Bratislava

Abstract: The coefficient of transforming the absorbed light to the heat was determined by laser-induced opto-acoustic spectroscopy (LIOAS) for ten derivatives of 2-hydroxybenzophenone in cyclohexane and acetonitrile. For most derivatives the value of the coefficient is equal to one in both solvents as for the parent 2-hydroxybenzophenone. The largest deviation from one upwards outside the error limit is observed for 5-nitro and 4-propoxy derivatives. It is suggested that there are derivatives in this class of substances which exhibit a more effective transformation of electronic energy to heat than the parent 2-hydroxybenzophenone. Less effective than 2-hydroxybenzophenone are 4-nitro and 5-methoxy derivatives, which indicates that longer living states are involved in the radiationless process. The effect of intramolecular hydrogen bond on the radiationless process is discussed.

Full paper in Portable Document Format: 484a223.pdf

Chemical Papers 48 (4) 223–225 (1994)