Schiff base Color M.Wt Melting point °C Yield % Crystallization Solvent VI White   516 >300 80 DMF, EtOH (9:1) VII White   484 >300 85 DMF, EtOH (9:1) VIII White   484 241 82 DMF, EtOH (9:1)

Table 1: Color, molecular weight and melting point of macrocyclichydrazone (V, VI, VII).