Lewis-Base Adducts of Group 11 Metal(I) Compounds. LVII. Crystal-Structure of Bis(2,6-diacetyl-pyridine)silver(I) Perchlorate

Abstract

The synthesis and room temperature structural characterization of the title compound [AgL₂]⁺(C10₄)^-, L= 2,6-diacetylpyridine, are reported. Crystals are orthorhombic, Pcan, a 19.629(7), b 14.603(4) and c 14.469(4) Å , Z = 8; R was 0.050 for 1987 'observed' reflections. The structure contains two independent [AgL₂]+ species, the central nitrogen atoms of the quasi-tridentate ligands being opposed in the coordination spheres of the silver atoms. Both have crystallographically imposed 2 symmetry; in one, this is normal to the N-Ag-N line [actual bond angle, 175.6(2); Ag-N, 2.316(6), Ag-O, 2.589(7) and 2.522(7) Å ], relating the two ligands. In the other, it is coincident; for one ligand Ag-N and Ag-O are 2.285(8) and 2.500(8) Å , while for the other the two values are 2.271(8) and 2.543(7) Å. The silver-nitrogen distances are appreciably longer than the value of 2.166(4) Å found for the [Ag( py )₂]⁺ cation.