Acta Cryst. (2001). E57, m438-m440  [ doi:10.1107/S1600536801014751 ]

ansa-Calcocenes: rac-[bis(3,3'-biacenaphthylenido)]bis(tetrahydrofuran)calcium

P.-J. Sinnema, B. Twamley and P. J. Shapiro

Abstract: The title compound, rac-[Ca(C₂₄H₁₂)(C₄H₈O)₂], was synthesized using activated calcium and the neutral ligand in the presence of THF. Both enantiomers are present in the asymmetric unit. The Ca atom is in a distorted pseudo-tetrahedral four-coordinate environment with the following range of bond distances and angles (Cp = cyclopentadienyl centroid): Cp-Ca 2.347  (4)-2.446  (4)  Å, Ca-O 2.346  (4)-2.357  (4)  Å, Cp-Ca-Cp 118.8  (2)-119.1  (2)° and O-Ca-O 87.39  (14)-87.93  (13)°.

Online 20 September 2001

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