ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
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)
Wednesday, September 30, 2020