Mono- and poly-nuclear neutral complexes have been obtained by electrochemical reaction of zinc or cadmium anodes with potentially hexadentate ligands H4Ln (n= 1–3). The ligands were prepared by 2∶1 condensation of 3-hydroxysalicylaldehyde and 1,2-diaminopropane, 1,3-diaminopropane or 1,4-diaminobutane, respectively. They can act either as N2O2 dianionic in mononuclear complexes or as N2O4 tetraanionic in polynuclear complexes, where metal ions are held together by μ-phenoxo bridges. X-Ray diffraction study of self-assembled [Zn8(L3)4(H2O)3]·H2O·¼MeCN shows a 3-D cage-like crystal structure, where the ligand units display O2 + N2O2 + O2 polynucleating behaviours.
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