Physico-chemical Investigation on Co(II), Ni(II) and Cu(II) Chelates of Ethylene Diamine N,N´ -bis-benzoic Acid

Abstract

Ethylene diamine N,N´-bis-benzoic acid (EDBBA) leads to the formation with divalent nitrates, quadridentate planar as well as trans-polymer complexes. The solution stabilities of these chelates determined pH-metrically are in fair agreement with the Irwing-Williams series of stability—Co(II), Ni(II), Cu(II). The stoichiometry (1:1) and the formation stability constants assign the m.f. C₁₆H₁₆N₂O₄, thereby defining the arrangement of molecules in the coordination sphere. Conductance, magnetic, electronic and IR techniques indicate the tetradentate coordination through azomethine nitrogen and oxygen of the carboxylic groups.