Organometallics p. 52 - 57 (1985)
Update date:2022-08-04
Topics:
Kinsley, Steven A.
Streitwieser Jr., Andrew
Zalkin, Allan
The title compounds were prepared by stoichiometric reaction of cyclooctatetraene, potassium, and either ytterbium or calcium, in liquid ammonia solution. The dimethoxyethane adducts of K2[Yb(C8H8)2] and K2[Ca(C8H8)2] are crystalline and have similar X-ray powder patterns; K2[Yb(C8H8)2] and K2[Ca(C8H8)2] have identical infrared spectra. X-ray structure analysis of [K(C4H10O2)]2[Yb(C8H 8)2] shows planar parallel eclipsed [8]annulene rings sandwiching a centrosymmetric ytterbium. A potassium coordinated with dimethoxyethane is at the opposite side of each ring. Crystals of [K(C4H10O4)]2[Yb(C8H 8)2] crystallize in the triclinic system of space group P1 with a = 9.346 (4) ?, b = 9.775 (4) ?, c = 7.740 (4) ?, α = 91.72 (4)°, β = 109.16 (4)°, and γ = 86.22 (4)° at T = 23°C.
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