Melting,volatilisation and crystal lattice enthalpies of acridin-9(10H)-ones |
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Authors: | Storoniak P Krzymiński K Boużyk A Koval'chuk E P Błażejowski J |
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Institution: | (1) Faculty of Chemistry, University of Gdańsk, J. Sobieskiego 18, 80-952 Gdańsk, Poland;(2) Department of Chemistry, Franko L'viv National University, Kyrylo and Mefodiy 8, 79 005 L'viv, Ukraine |
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Abstract: | The enthalpies and temperatures of melting and sublimation of acridin-9(10H)-one, 10-methylacridin-9(10H)-one, 2,10-dimethylacridin-9(10H)-one,
10-methyl-2-nitroacridin-9(10H)-one, 10-ethylacridin-9(10H)-one and 10-phenylacridin-9(10H)-one were measured by DSC. Enthalpies
and temperatures of volatilisation were also obtained by fitting TG curves to the Clausius-Clapeyron relationship. Complementary
investigations for anthracene showed the extent to which the thermodynamic characteristics thus obtained compare with those
determined by means of other techniques. For compounds whose crystal structures are known, experimental enthalpies of sublimation
correspond reasonably well to crystal lattice enthalpies predicted theoretically as the sum of electrostatic, dispersive and
repulsive interactions. Analysis of crystal lattice enthalpy contributions indicates that dispersive interactions always predominate.
Interactions are enhanced in acridin-9(10H)-one where intermolecular hydrogen bonds occur: this is reflected in the relatively
high enthalpy of sublimation.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | crystal lattice enthalpies enthalpies and temperatures of sublimatio anthracene enthalpies and temperatures of melting acridin-9(10H)-ones |
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