A carregar...
Publicação
Thermochemical and theoretical study of bipyridines
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 521.27 KB | Adobe PDF |
Orientador(es)
Resumo(s)
The following standard molar enthalpies of formation in the gaseous state at 298.15 K were
determined from the enthalpies of combustion of the crystalline solids and the respective enthalpies
of sublimation: 2,2’-bipyridine, 267.9 f 3.0 kJ mol-’; 2,4’-bipyridine, 284.2 f 2.7 kJ mol-’; 4,4‘-
bipyridine, 293.1 f 3.6 kJ mol-’. Ab initio geometry optimizations of these molecules at the 3-21G
level suggest that those with at least one ortho nitrogen atom assume near planar conformations
preferentially, while the others have nonplanar most stable forms.
Descrição
Palavras-chave
Contexto Educativo
Citação
Editora
American Chemical Society