The Thermal Decomposition Products of Mn(lll)EDTA and Mn(lll)CyDTA Complexes

Abstract

By the thermal dec, mposition reactinof ethylenedinitri1otetraacetatomamaganate(III) complex (Mn(III)EDTA)and trans-1, 2-cyc1, hexyleedinitri1 tetraacetatomanganate(III) (Mn complex (III)CyDTA), manganese(III) ions in these complexes are reduced t, manganese(III) ions This PaPerM deals' with the chemical formula of the species which are Jformed by.. the thermal ae60rnposition reaction of these complexes. The experimental methods are 4s follews;Afteorr the thermal decomposition reaction was completed, the reaction preducts were changed to Co(III) complexes, which were separated by the ion-exchange chr, matographic techpique t an anioriic, a hon-charged and a cationic part. Frem the anionic and the non-charged part, crystals were obtained and identified by elemental analyses, IR and visible absorption spectraReaction prodqcts in the cationic part were not identified because of a small amount of this part, These results are give in Tables 2 and 3 and Figs.3and 4 By this procedure, Co(III)EDTA, Co(III)CyDTA, ethylenedinitrilotriacetatocobalt(III)(Co(III)EDTRA)and trans-1, 2-cyclo hexylenedinitrilbtriacetatocobalt(III)(Cd(III)CyDTRA)60mplexesnwere confir ned. Gaseous products were identified by polarographic and gas chromatographic methods.From these results, it was found that therma1 decomposition products of Mn(III)EDTA and Mn(III)CyDTA complexes in solid state contained EDTRA, CyDTRA, CO2, CO and HCHO. In addition to these, it was found that unchanged ligands (EDTA and CyDTA) still remained even after the complete red uction of Mn(III)in Mn(III)complexes to Mn(III). The am, ount of each part was determined and visible absorption spectra of Co(III)EDTRA and Co(III)CyDTRA complexes are given in Tables 4, 5 and Fig.5.From this work, it is concluded that, (1) The thermal decomposition reaction in solid state involves the intermolecular electron transfer reaction, and(2)By the thermal decomposition reaction of aminopolycarboxylatemanganese(III)complex, new type of ligands such as EDTRA and CyDTRA may be produced.