Abstract
Treatment of 1,2,3,4,5-pentamethylcyclopenta-2,4-dien-1-yl arsenic(III) dichloride (II) with two equivalents of cobaltocenium fluoride or potassium iodide affords the analogous compounds Cp*AsF2 (I) and Cp*AsI2 (IV) in 85% and 98% yield respectively. Cp*AsBr2 (III) has been synthesized by direct metathesis reaction between AsBr3 and Cp*Li in 70% yield. The new compounds have been characterized by spectroscopic methods (1H,13C,19F NMR, El-MS) and elemental analyses. The crystal structures ofI–IV were determined by X-ray diffraction methods. The AsX2-moiety inI–IV is σ-bound to the cyclopentadienyl ligand, indicating remarkable π-interaction with the diene fragment of the cyclopentadienyl ring. In addition, weak intermolecular contacts are observed inI andIV, completing the coordination sphere around the arsenic atom to pseudo-tetrahedral.
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