Interaction of Calix[4]arene and Aliphatic Amines: A Combined NMR, Spectrophotometric and Conductimetric Investigation
نویسندگان
چکیده
As constantes relacionadas ao equilíbrio entre calix[4]areno e aminas alifáticas em acetonitrila foram medidas por métodos condutivimétrico e espectrométrico e as estruturas dos sais estudadas por espectroscopia de RMN. Em concentrações próximas a 10 mol L predominam os íons livres, enquanto que a 10 mol L aumenta a proporção de pares iônicos. Os valores das constantes para as reações ácido-base permitem avaliar o valor de pKa do calix[4]areno em acetonitrila, igual a 16,6 unidades de pKa. A análise do conjunto de dados está de acordo com a proposta de complexos com o íon amônio em posição exo-calix.
منابع مشابه
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