Use of acid-base and redox chemistry to synthesize cobalt(III) and iron(III) complexes of a partially deprotonated triprotic imidazole-containing Schiff base ligand: Hydrogen bound 1D linear homochiral and zig-zag heterochiral supramolecular complexes

作者：Alvarado Luigi; Brewer Greg^*; Carpenter Everett E; Viragh Carol; Zavalij Peter Y

来源：Inorganica Chimica Acta, 2010, 363(4): 817-822.

DOI：10.1016/j.ica.2009.12.005

• X-ray crystal structures
• Supramolecular complexes
• Iron
• Cobalt
• Imidazole

Aerial reaction of cobalt(II) perchlorate with H(3)(1) [H(3)(1) is the tripodal ligand derived from the condensation of tris(2-aminoethyl)amine with three equivalents of imidazole-2-carboxaldehyde] in methanol and [FeH(3)(1)(ClO(4))(2)] with Fe(1) in acetonitrile results in the formation of [CoH(2)L](ClO(4))(2)center dot H(2)O and [FeHL]ClO(4)center dot CH(3)CN, respectively. Mossbauer spectroscopy and variable temperature magnetic susceptibility indicate that [FeHL]ClO(4)center dot CH(3)CN is a low spin iron(III) species. Both complexes were characterized by EA, IR, and single crystal structure determinations. Both complexes crystallize in the centrosymmetric monoclinic space group, P2(1)/c, so both enantiomers of the chiral complex are present. The supramolecular features of these complexes, caused by the partial deprotonation of the ligand and the resultant formation of imidazole-H center dot center dot center dot imidazolate hydrogen bonds, are different. [FeHL](+) forms hydrogen bonds with molecules from adjacent cells of like chirality. This results in a linear homochiral array of iron complexes. In contrast, [CoH(2)L](2+) forms hydrogen bonds with a molecule from the same cell and one from another cell resulting in an 1D alternating heterochiral zig-zag chain.

• 出版日期2010-3-1