(1)[Ti(NH3)6]3+(2)[V(gly)2(OH)2(NH3)2]+(3)[Fe(en)(bpy)(NH3)2]2+(4)[Co(OX2)(OH)2]−
Where (gly) = glycine, en = ethylenediamine and bpy = bipyridylmoities
(At. Nos. Ti=22, V=23, Fe=26, Co=27)