STEREOCHEMISTRY OF [CU(TRIDENTATE LIGAND)(2)] ENTITIES - CRYSTAL AND MOLECULAR-STRUCTURE AND ELECTRONIC-PROPERTIES OF [CU(TEDPA)(2)](PF6)(2) (TEDPA=N,N,N'N'-TETRAETHYL PYRIDINEDICARBOXAMIDE)

The crystal and molecular structure of [Cu(tedpa)(2)](PF6)(2) have bee n determined by X-ray diffraction methods. The compound is built up of cationic [Cu(tedpa)(2)](2+) and PF6- groups. The coordination geometr y about the copper atom can be described as an elongated and strongly distorted octahedron (CuN2O3O' chromophore). The EPR powder spectrum i s slightly orthorhombic and from the g values and the partially resolv ed hyperfine components some covalency and molecular parameters have b een estimated. EPR single crystal experiments indicate that the g-tens or axes follow the molecular bonds. Copyright (C) 1996 Elsevier Scienc e Ltd