The paper presents a study on the physicochemical properties of some new symmetrical diquaternary salts of 4,4\u27-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
