Studies on the metalamide bond. VIII. The crystal structure of [N,N′-bis(2′-pyridinecarboxamido)-trans-1,2,-cyclohexane] nickel(II)

Moh'd Mulqi*, Frederick S. Stephens, Robert S. Vagg

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    31 Citations (Scopus)


    [N,N′-bis(2′-pyridinecarboxamido )-trans-1,2-cyclohexane] nickel(II) C18H18N4Ni, is monoclinic, space group I2/a, with a = 13.652(8), b = 12.127(6), c = 10.739(5) Å, β = 106.0(1)°, Z = 4. The structure was refined to R = 0.088 for 811 photographic reflexions using least-squares calculations. The molecule has space group imposed C2(2) symmetry and the nickel atom is four-coordinate with the ligand acting as distored square-planar N4-tetradentate [NiN(amide) 1.868(7), NiN(pyridine) 1.944(8) Å, N(amide)Ni;N(amide) 86.2(4)°, N(pyridine)Ni;N(pyridine) 107.0(4)°]. The amide nitrogen atom is best described as having a flattened pyramidal geometry. Steric interactions are further alleviated by rotations with the non-planar amide chelate ring. The cyclohexane ring adopts a skew-chair conformation in which the methine hydrogens are in transconfiguration. The molecules are packed in the lattice in layers parallel to (101).

    Original languageEnglish
    Pages (from-to)73-77
    Number of pages5
    JournalInorganica Chimica Acta
    Issue numberC
    Publication statusPublished - 1981


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