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Crystal and molecular-structure and properties of tetrakis-(dichloroacetato)bis (μ-pyridine-N-oxide)bis(pyridine-N-oxide)-dicopper(II)

F. Pavelčík, M. Žemlička, V. Kettmann, and J. Kratsmár-Šmogrovič

Department of Analytical Chemistry, Faculty of Pharmacy. Comenius University, CS-83232 Bratislava


Abstract: The title compound Cu2(Cl2CHCOO)4(pyO)4 was synthesized and its crystal structure was solved at room temperature. It crystallized in the triclinic space group PT with a = 0.8807 nm, b = 1.0657 nm, с = 1.1628 nm, а = 73.43°, ß = 74.62°, ϒ = 68.55°, and Z = 1. Least-squares refinement of the structure led to a conventional R factor of 0.0455. The crystal structure is composed of well separated centrosymmetric binuclear molecules in which the geometry around each copper ion approximates a square-based pyra­mid. The copper atoms are linked by two N-oxide bridges from an apical coordination site of one Cu(II) to a basal site of another. Variable tem­ perature magnetic susceptibility measurements did not detect down to 93 К an effective exchange coupling within the copper(II) ion pair of the dimer. The IR spectrum clearly manifests that the N-oxide ligands are coordinated both in bridged and nonbridged forms; the carboxylato ligand in monodentate form only.

Full paper in Portable Document Format: 414a433.pdf


Chemical Papers 41 (4) 433–440 (1987)

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