Poly(acrylic acid-co-maleic acid)-metal complexes with copper(II), cobalt(II), and nickel(II) - Synthesis, characterization and structure of its metal chelates

Polychelates were obtained by addition of an aqueous solution of the copoly mer poly(acrylic acid-co-maleic acid) to the aqueous solutions of Cu(II), C o(II), and Ni(II) chlorides. Elemental analyses, as well as magnetic, spect ral and thermal properties, in addition to electrical conductivities of the chelates were investigated, and possible structures have been assigned to the chelates. All the polychelates were found to include water. The chelate with Co(II) showed a thermotropic effect between 50 degrees C and 70 degre es C with a change in color, thermal behavior, and geometry arrangement. Se mi-empirical calculations at the PM3 level were carried out on the geometri cal arrangement of the polychelates. (C) 1999 Elsevier Science Ltd. All rig hts reserved.