Infrared And Visible Spectra And Magnetic Properties Of Sodium And Potassium Bis(2,4-Pentanedionato) Selenito Cobaltate (II) And Nickelate (II), Complexes

Inorganic anions are commonly used as ligands in coordination chemistry (1, 2). The properties of the selenite anions in aqueous solution are important in determining selenito complex formation. In dilute aqueous solutions, selenous acid is dibasic (K1 = 4 x 10-3; K2 = 10-8 )forming HSe03 and Se03 anions. At higher concentrations, extensive dimerization occurs with these species to yield-H(Se 02) 3 2 H2 (Se03)2 2 , H3(Se 03)2 and H4(Se 03)2. Limited information is available about the selenite group as a ligand in coordination chemistry. A general survey on the preparation and structure of selenites and mixed selenito complexes of transition metals will be represented later on. The study of the I.R. modes of the selenite group in these complexes is still lacking although the X-ray structure of some normal selenites is already established. Also, the magnetic behaviour of these complexes needs furtehr investigation and study. The structure of these complexes will be deduced from their visible spectra, magnetic moments and I.R. spectra.