Studies on the metalamide bond. VII. Metal complexes of the flexible N4 ligand N,N′-bis(2′-pyridinecarboxamide)1,2-ethane

David J. Barnes*, Ross L. Chapman, Frederick S. Stephens, Robert S. Vagg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)


The isolation and characterization of a series of transition metal complexes is described with the ligand bpenH2 in both neutral and deprotonated forms. The ligand acts as a planar N4 tetradentate in the monomeric deprotonated complexes of general forms M(bpen)nH2O (M = CuII, NiII, PdII or PtII. Metal chloride and perchlorate salts of the neutral ligand, of general formulae M(bpenH2)Cl2nH2O and M2(bpenH2)3(ClO4)4nH2O, are reported (M = MnII, FeII, CoII, NiII, CuII or Zn11) with the ligand bonding through pyridine-N and amine-O atoms in a bridging bis-bidentate function. In the chloride complexes high-spin six-coordinate geometries are indicated for the polymeric solid products. The perchlorate complexes are dimeric and high-spin, with each metal atom exhibiting N3O3 six-coordination. Proton NMR studies on the ligand show coupling of the amide protons with those of the central ethylene group. Deprotonation is confirmed by loss of this coupling for the Ni11, Pd11 and Pt11 chelates, 1H195Pt coupling being observed in the latter compound The neutral and deprotonated chelate forms also are readily differentiated by thier IR absorption. Deuterium isotopic substitution of amide protons has been used to assist IR assignments.

Original languageEnglish
Pages (from-to)155-162
Number of pages8
JournalInorganica Chimica Acta
Issue numberC
Publication statusPublished - 1981


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