Abstract
The template reaction of 2,6-diacetylpyridine with 1,8-diaminonaphthalene in the presence of calcium(II), strontium(II) and barium(II) nitrates produced the new hexadentate N 4O 2 open-chain complexes as a result of [2 + 1] Schiff base condensation, irrespective of the molar ratio of starting materials used in the synthesis. They were characterized by IR, UV-vis, 1H NMR and analytical data. No [2 + 2] macrocyclic complexes were isolated, either in the template synthesis, nor on the treatment of the [2 + 1] acyclic complexes with diamine.
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