viologen molecular switches incorporating bis(acetylacetonato) cobalt(ii) and bis(3- chloroacetylacetonato) cobalt (ii) complexes

Cobalt(ii) complexes: coa and coacl are synthesized. treatment of coa with 10 equivalents of 4,4-bipyridine (bpy) in acetone afforded adduct complex coa-bpy. these three cobalt(ii) complexes are characterized by ft-ir, mass and uv-visible absorption spectrometries besides thermal and xrd analysis. the interactions of the complexes coa and coacl with bpy to afford the adduct complexes are studied by uv-visible absorption spectrometry. the interactions of the complexes coa and coacl with propylene linked bis-viologen (v2+a2.2pf6-) yield the adduct complexes coordination of v2+2.2pf6- to cobalt(ii) ion within cobalt(ii) complexes. then, switching motion of v2+2.2pf6- coordinated to co(ii) ion was triggered by two electrons reduction.