$\begin {array} {1 1} (1)\;[Ti(NH_3)_6]^{3+} & \quad (2)\;[V(gly)_2(OH)_2(NH_3)_2]^+ \\ (3)\;[Fe(en)(bpy)(NH_3)_2]^{2+} & \quad (4)\;[Co(OX_2)(OH)_2]^- \end {array}$
Where (gly) = glycine, en = ethylenediamine and bpy = bipyridylmoities
(At. Nos. Ti=22, V=23, Fe=26, Co=27)
