Abstract
Abstract A 1:1 adduct of benzoycyclooctatetraene and silver perchlorate, C 12 H 10 ·AgClO 4 , 1 , has been isolated and characterized by X-ray crystallography. Complex 1 crystallizes in space group P 2 1 / c with Z = 4, a = 8.045(2), b = 17.412(4), c = 8.501(1) A, β 91.13(2)°, and V = 1190.6(4) A 3 . The structure has been refined to R F = 0.051 and R wF = 0.072 for 2165 observed Mo- K α data and 154 variables. The perchlorate group exhibits two unequally populated orientations about the central chlorine atom. The three moieties in compound 1 are interconnected by ionic (metaloxygen) and covalent (metalolefin and metalaromatic) bonds to form layers parallel to the bc plane. The coordination about the silver ion may be described as distorted trigonal bipyramidal, the ligand sites being filled by two non-adjacent double bonds of a benzocyclooctatetraene molecule, one aromatic CC bond of a neighbouring benzocyclooctatetraene molecule, and two oxygen atoms belonging to different perchlorate groups. This is the first reported instance of simultaneous donor π-bonding from aromatic and olefinic ligands to a silver ion.
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