The binuclear Th complex 1 contains a new type of P6 ligand, which is derived formally from P6 benzvalene. Amber‐colored, extremely air‐sensitive crystals of 1 are formed on cothermolysis of the butadiene complex [Cp2Th(η4‐C4H6] and P4 in toluene.
The cothermolysis of [Cp"Nb(CO),] (11, Cp" = C6H3(tBu)2-1,3, and P4 affords the 26-valence-electron triple-decker sandwich complex [ (CpWb)2Gc-q6:q6-Ps)l (2). Ita X-ray structure determination shows that the Po middle deck is severely bisallylically distorted (orange crystals, monoclinic space group R1/n, a
IntroductionDuring the last six years many novel triple-decker sandwich complexes with cyclo-P,-or cyclo-As,-unita as middle deck have been ~yntheaized."~ Several theoretical studies gave some insight into the bonding and electronic structure of these compound^.^^^
The arsenic analogue of cyclooctatetraene cyclo‐As8 can be stabilized as a strongly distorted, puckered eight‐membered ring in a complex of niobium (1; each Nb atom also bears a 1,3‐di‐tert‐butylcyclopentadienyl ligand). Complex 1 reacts with [Cr(CO)5(thf)] to form a trinuclear Nb2Cr cluster.
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