Abstract
A crystal of bis(2,3-dicarbomethoxynorbornadiene)dicarbonylmolybdenum is in space group P2 1/ c, with a 11.0406(25), b 14.7281(29), c 15.3310(27), β 110.38(2)° and Z = 4. Very large out-of-plane torsional angles (27–41°) for the vinylic carbomethoxy groups are observed. The bonding properties therefore are analyzed by comparison of spectroscopic data with those of related complexes, i.e. L 2Mo(CO) 2 where L = norbornadiene, 2- p-tosylnorbornadiene, and 2-carbomethoxynorbornadiene. Instead of σ-bond, metal to CC π-coordinations are believed to exist in these complexes. The presence of electron-withdrawing groups on the NBD ligands has increased their chelation strength, but at the same time has weakened the metalCO bonds.
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