Abstract
The bis(η 5-methylcyclopentadienyl)-1,2-dimethoxyethane compounds of calcium and ytterbium are obtained from the interaction of the metal with freshly distilled methylcyclopentadiene (Hmecp) in liquid ammonia, followed by crystallization from 1,2-dimethoxyethane (DME). In a similar reaction cyclooctatetraenylcalcium has been synthesized and characterized by metal analysis and vibrational spectroscopy. Ca(mecp) 2 · DME crystallizes in the monoclinic space group C2/ c with a 1121.4(2), b 1180.2(2) and c 1228.2(2) pm, β 102.11(1)° and ρ calc. 1.206 g/cm 3 for Z = 4. The calcium ion is pseudo-tetrahedrally coordinated by the centres Z of the two methylcyclopentadienyl rings and the O atoms of the bidentate DME ligand. The crystal structure of Ca(mecp) 2 · DME represents the first of the type Mcp 2 · 2L or Mcp 2-η 2-L in the main group series and is extensively compared to related lanthanide compounds. On the basis of a new model the cyclopentadienyl compounds are divided into different groups. The model theory is used to predict the important structural parameters for the cyclopentadienyl compounds.
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