Studies on the metalamide bond XI. The structure of aqua[N, N′-bis(2′-pyridinecarboxamido)-trans-1, 2-cyclohexane] copper(II) dihydrate

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

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    Aqua[N, N′-bis(2′-pyridinecarboxamido)-trans-1, 2-cyclohexane] copper(II) dihydrate, C18H24N4O5Cu, is monoclinic, space group P21/c, with a = 9.094(10), b = 17.620(7), c = 12.141(7) Å, β = 91.9(1)°, Z = 4. The structure was refined to R = 0.088 for 2787 photographic reflexions using least-squares calculations. The copper atom is five-coordinate with the ligand acting as an essentially planar N4-tetradentate which encompasses the base of a distorted square-based pyramid [average CuN(amide) 1.934(5), CuN(pyridine) 2.026(5) Å, N(amide)CuN(amide) 83.5(2)°, N(pyridine)CuN(pyridine) 110.2(1)°]. The copper atom is displaced by 0.19 Å from the N4-plane towards the apical water molecule [CuO 2.338(5) Å]. Both amide nitrogen atoms are approximately 50% pyramidally distorted. The cyclohexane ring adopts a chair conformation in which the two methine hydrogen atoms are in a trans configuration. The coordinated and the two lattice water molecules are involved in a hydrogen-bond network which includes the carboxyl oxygen atoms of the amide groups of neighbouring chelate molecules. The chelate molecules pack in layers parallel to (101).

    Original languageEnglish
    Pages (from-to)177-182
    Number of pages6
    JournalInorganica Chimica Acta
    Volume52
    DOIs
    Publication statusPublished - 1981

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