W. Radeckaparyzek et V. Patroniak, THE TEMPLATE SYNTHESIS AND CHARACTERIZATION OF ALKALINE-EARTH METAL-ION NITRATE MACROACYCLIC SCHIFF-BASE COMPLEXES, Polyhedron, 13(14), 1994, pp. 2125-2128
The template reaction of 2,6-diacetylpyridine with 1,8-diaminonaphthal
ene in the presence of calcium(II), strontium(II) and barium(II) nitra
tes produced the new hexadentate N4O2 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 b
y IR, UV-vis, H-1 NMR and analytical data. No [2 + 2] macrocyclic comp
lexes were isolated, either in the template synthesis, nor on the trea
tment of the [2 + 1] acyclic complexes with diamine.