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Standard enthalpies of formation of 2-thenoyltrifluoroacetone and monothio-2-thenoyltrifluoroacetone by rotating-bomb calorimetry

✍ Scribed by M.A.V. Ribeiro da Silva; L.M.N.B.F. Santos; G. Pilcher

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 185 KB
Volume: 29
Category: Article
ISSN: 0021-9614
DOI: 10.1006/jcht.1997.0202

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✦ Synopsis

The standard (p°= 0.1 MPa) molar enthalpies of formation of crystalline 1,1,1-trifluoro-4-(2-thienyl)-4-hydroxy-3-buten-2-one, HTTFA, and 1,1,1-trifluoro-4-(2-thienyl)-4-mercapto-3buten-2-one, HTTFAS, at T = 298.15 K were measured by rotating-bomb calorimetry and the standard molar enthalpies of sublimation at T = 298.15 K were measured by microcalorimetry, with the following results:

HTTFA

-948.6 2 4.1 86.18 2 0.64 HTTFAS -725.4 2 3.9 95.1 2 3.7

The results demonstrate an increase in stabilization energy of 1 (38.7 2 5.0) kJ•mol -1 in HTTFA compared with thiophene and that in these molecules, the intramolecular hydrogen bond energy (O-H • • • O), appears 1 20 kJ•mol -1 larger than for (S-H • • • O).

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