CHEMICAL AND PHYSICAL-PROPERTIES OF SOME DIVALENT TRANSITION-METAL LENS WITH ALIZARIN-S

Stability constants and related thermodynamic parameters characterizin g the formation of divalent Mn, Fe, Co, Ni and Cu complexes with aliza rin S were determined potentiometrically. The results show that the co mplex formation is an exothermic process. Conductometric and photometr ic titrations were carried out to illustrate the stoichiometric compos ition of the complexes formed. The mode of complexation was ascertaine d by IR spectra. The electrical conductivities of alizarin and its com plexes were measured in the temperature range 298-400 K. The conductio n takes place according to the hopping mechanism.