Synthetic and structural studies of the trans bis(2-N-H- pyrrolylcarbaldimine) complexes of nickel(II) and palladium(II)

Sarah Holzer, Frank R. Fronczek, Victor G. Young, Stephen Fox

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Abstract

The molecular bis(2-N-H-pyrrolylcarbaldimine)nickel(II) and palladium(II) complexes are isolated in moderate yield (30-35%) from in situ assembly of the Schiff base with metal(II) salt, base, and pyrrole-2-carbaldehyde in aqueous ammonia solution. The nickel(II) complex, 1, is monoclinic, space group P2 1/c, with a=11.289(6) Å, b=5.611(3) Å, c=8.287(5) Å, β=111.620(6)°, and V=488.0(5) Å3 with Z=2, for d calc=1.667 Mg/m3. The palladium analog, 2, is isomorphous, space group P21/c, with a=11.481(3) Å, b=5.5738(10) Å, c=8.276(2) Å, β=110.923(12)°, and V=494.7(2) Å3 with Z=2, for d calc=1.965 Mg/m 3. In both crystal structures, the metal resides on an inversion center. In the IR spectra, ν(C=N) appears at 1561 cm-1 in 1, and 1557 cm-1 in 2, while ν(N-H) shows at 3345 cm-1 and 3335 cm-1, respectively. The 1H-nmr spectra reveal the C-H and N-H protons of the imine group as sharp and broad doublets, respectively, at 7.62 and 8.38 δ in 1 and at 7.92 and 9.73 δ in 2.

Original languageEnglish (US)
Pages (from-to)883-889
Number of pages7
JournalJournal of Chemical Crystallography
Volume36
Issue number12
DOIs
StatePublished - Dec 1 2006

Keywords

  • Diamagnetic
  • Nickel(II)
  • Palladium(II)
  • Planar
  • Pyrrolate
  • Schiff-base

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