Original scientific paper

Physico-Chemical Characterization of Some Diquaternary Salts of 4,4'-Bipyridine

Marinela Irimia ; Technical University »Gh. Asachi« Iassy, Faculty of Industrial Chemistry, Department of Physical Chemistry, Mangeron Street 71, 6600 Iassy, Romania
Gabriela Lisa ; Technical University »Gh. Asachi« Iassy, Faculty of Industrial Chemistry, Department of Physical Chemistry, Mangeron Street 71, 6600 Iassy, Romania
Ramona Danac ; University »Al. I. Cuza« Iassy, Faculty of Chemistry, Department of Organic Chemistry, Carol I Street 11, 6600 Iassy, Romania
Neculai Aelenei ; Technical University »Gh. Asachi« Iassy, Faculty of Industrial Chemistry, Department of Physical Chemistry, Mangeron Street 71, 6600 Iassy, Romania
Ioan Drutã ; University »Al. I. Cuza« Iassy, Faculty of Chemistry, Department of Organic Chemistry, Carol I Street 11, 6600 Iassy, Romania

Abstract

The paper presents a study on the physicochemical properties of some new symmetrical diquaternary salts of 4,4'-bipyridine. The properties refer to the acid-basic and thermal behavior of these compounds. The chemical stability of these salts in solution was found to be pH dependant. Thus, in the basic medium they converted into amphionic compounds of the N-ylide type and the equilibrium between salt (acid character) and N-ylide (basic character) was observed. The acid-basic equilibrium was made evident by pH-meter titrations. The thermal stability was studied by the thermogravimetric analysis under dynamic temperature conditions. The complexity of degradation as a consequence of chemical structure was revealed and the kinetic and thermodynamic parameters of the degradation were determined.

Keywords

diquaternary salts of 4,4'-bipyridine; acido-basic behavior; thermal stability

Hrčak ID:

102982

URI

https://hrcak.srce.hr/102982

Publication date:

30.11.2004.

Visits: 1.517 *