XAFS STUDY ON CO(II) POLYAMINE COMPLEXES

The XAFS study is performed for a new Co(II) polyamine complex; NN'-bi s(3-aminopropyl) 1,3propanediamine Co(II) complex (Co-APPD), the Co-AP PD reacted with oxygen (Co-APPD(O2)), and their solution in DMSO and D MSO with 2-furancarboxylic acid (FRA). The Co-APPD(O2) complex is foun d to be trivalent and has the similar local structure around Co to tha t in [Co(NG3)6]Cl3. The difference in the XANES between solid Co-APPD and Co-APPD DMSO solution is quite small. It is considered that the di fference of geometrical and electronic structure around Co is also qui te small by dissolving Co-APPD in DMSO. Addition of FRA to the Co-APPD DMSO solution changes octahedral structure around Co into tetrahedral structure.