The electrolysis was carried out in a three electrode undivided glass cell in a potentiostatic mode in argon atmosphere at room temperature(Т = 295 K)using a P-30S potentiostat. During the electrolysis, the solution (DMF, 0.1 M Bu4NPF6, 0.5 mM MVCA-С5 8+·8PF6−, V =10 ml) was stirred with a magnetic stirrer. We used platinum plate(S = 3.12 сm2) as cathode, silver wire (S = 0.3 сm2) as anode and SCE as reference electrode. The solution after the electrolysis were controlled by CV on the indicator GC disk electrode (d=3.4 mm) directly into the electrolyzer.