Abstract
The template reaction of 2,6-diacetylpyridine with biogenic diamine–putrescine in the presence of cadmium(II), mercury(II) or lead(II) ions produces the complexes of 22-membered macrocyclic ligand L1 with an N6 set of donor atoms as a result of [2 + 2] Schiff base cyclocondensation. The lead(II) complex containing Schiff base acyclic ligand L2 terminated by one carbonyl and one amine group as product of the partial [2 + 2] condensation has been also isolated and might be regarded as possible intermediate in the formation of the macrocyclic L1 complex. Analogous reaction involving the uranyl nitrate generates the complex containing the same Schiff base acyclic ligand L2 as a final product of template reaction. The complexes were characterized by spectral data (IR, 1H NMR, FAB-MS), thermogravimetric and elemental analyses. A notable feature of the FAB mass spectrum of the uranyl complex is the appearance of the clusters of the form [(UO2) n O]+(n= 1–7) along with the peak corresponding to molecular ion.
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