(η-Cyclopentadienyl)imido derivatives of molybdenum and tungsten

Abstract

The new paramagnetic compounds [M(η-C₅H₄R)X₂(NR′)](M = Mo, X = Cl, R′= Bu^t, R = H, Me or Pr^i., M = Mo, X = Cl, R = H, R′= Prⁱ, Prⁿ or Ph; M = Mo, X = Cl, R = Me, R′= Ph; M = Mo, X = Br, R = Me, R′= Bu^t; M = W, X = Cl, R′= Bu^t, R = H or Me) have been prepared and the crystal structure of [Mo(η-C₅H₅)Cl₂(NBu^t)] has been determined. The new diamagnetic molybdenum(IV) compounds of general formula [Mo(η-C₅H₄R)Cl(L)(NR′)] where L = ethene, propene, styrene, but-2-yne or carbon monoxide have been synthesised. The mercury-bridged compounds [{Mo(η-C₅H₄R)(C₂H₄)(NBu^t)}₂(µ-Hg)](R = H or Me) have also been obtained, together with the compound [Mo(NBu^t)Cl₂(PMe₃)₃]. The crystal structures of [Mo(η-C₅H₄Me)Cl(C₂H₄)(NBu^t)], [(Mo(η-C₅H₅)-(C₂H₄)(NBu^t)}₂(µ-Hg)] and [Mo(NBu^tCl₂(PMe₃)₃] have been determined.