Polynucleating macrocyclic compounds

Cu2(L1631)Cl2 6H20 and Ni(H2L1631)(C104)2-H20 were obtained in this way 

In the absence of metal ions, in the presence of a labile first-row transition metal or in the presence of d metal ions such as Ni, Cu or Zn , cyclisation does not proceed cleanly [7]. Resin-like polymeric products, which were not identified due to their complete insolubility in common solvents and their involatility, were commonly isolated [6, 8], 

The copper(II) complex with H2LI634 has also been synthesised by the template technique [14]. The structure of [Cu2(L1634)Cl2][Cu2(L1634)(H20)2]Cl(C104)-5.5H2O, prepared from [Cu2(L1634)](C104)2, is available [15]. 

Study of the electrochemical behaviour of homo (CU2) and hetero (CuM) bi-nuclear coordination compoimds with H2LI63I shows that these substances undergo reversible or quasireversible Cu -Cu reduction. If CO is passed through the system simultaneously, it is captured by coordination to the forming copper(I). The reduction of the Cu2 complex proceeds in a stepwise fashion with final conversion to Cu Cu. The complex Cu Cu (L1631)(CO)2 is formed in contact with carbon monoxide [17-19]. 

It is noteworthy that sodium 2,6-diformyl-4-methylphenolate reacts easily with 1,3-diaminopropane, leading to a 2 -t- 2 macrocycUc Schiff base isolated as its disodium complex [26]. The latter undergoes transmetallation by transition metals to yield dinuclear macrocyclic complexes [27]. 

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