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Standard enthalpies of combustion of five halogen-substituted 8-hydroxyquinolines by rotating-bomb calorimetry

✍ Scribed by Manuel A.V. Ribeiro da Silva; Maria Luı́sa C.C.H. Ferrão; Adelina M.R.O. Alves da Silva

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
344 KB
Volume
27
Category
Article
ISSN
0021-9614

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✦ Synopsis

The standard ( p°=0.1 MPa) molar enthalpies of formation of five crystalline halogen-substituted 8-hydroxyquinolines, at the temperature T=298.15 K, were derived from measurements of the standard molar enthalpies of combustion in oxygen by rotating-bomb calorimetry.

DfH°m(cr)/(kJ•mol

-1 ) 5-chloro-8-hydroxyquinoline C9H5NCl(OH) -124.221.9 5,7-dichloro-8-hydroxyquinoline C9H4NCl2(OH) -158.121.8 5,7-dibromo-8-hydroxyquinoline C9H4NBr2(OH) -40.522.8 7-bromo-5-chloro-8-hydroxyquinoline C9H4NBrCl(OH) -127.722.1 5,7-diiodo-8-hydroxyquinoline C9H4NI2(OH) +93.521.7

Using literature values of their standard molar enthalpies of sublimation, the standard molar enthalpies of formation, at T=298.15 K, of the gaseous compounds were derived. These values are compared with those estimated by means of structural contributions.

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