Possible different behaviour of 4,4'-(4,4'-biphenylylenebisazo)--di(2-hydroxyacetophenone) in its copper(II), zinc(II), iron(II), iron(III) and dioxouranium(VI) chelates

Properties of polychelates are derived by polymerising monomeric symmetric tetra-functioning ligands through metal ion. In an attempt to prepare such polychelates of 4,4'-(4,4'-biphenylylenebisazo)-di(2-hydroxyacetophenone) (L), polychelates for Fe(II) are obtained and Fe(III), Cu(II) give dinuclear chelate of the formula CU2L(NO3)2.(H2O)6, while mononuclear chelates for UO2sup(II) and Znsup(II). In the first case the polychelates have been obtained by polymerisation of L through metal ion in which L is tetra-functioning. In the second case L is tetra-functioning without any further polymerisation while in the last case it is bifunctioning. (author). 12 refs