Zusammenfassung
Reduction of [Cp*Fe(eta(5)-As-5)] with [Cp-2 '' Sm(thf)]/(Cp '' = eta(5)-1,3-(tBu)(2)C5H3) under various conditions led to [(Cp-2 '' Sm)(mu,eta(4):eta(4)-As-4)(Cp*Fe)] and [(Cp-2 '' Sm)(2)As-7-(Cp*Fe)]. Both compounds are the first polyarsenides of the rare-earth metals. [(Cp-2 '' Sm)(mu,eta(4) :eta(4)-As-4)(Cp*Fe)] is also the first d/f-triple decker sandwich complex with a purely inorganic ...
Zusammenfassung
Reduction of [Cp*Fe(eta(5)-As-5)] with [Cp-2 '' Sm(thf)]/(Cp '' = eta(5)-1,3-(tBu)(2)C5H3) under various conditions led to [(Cp-2 '' Sm)(mu,eta(4):eta(4)-As-4)(Cp*Fe)] and [(Cp-2 '' Sm)(2)As-7-(Cp*Fe)]. Both compounds are the first polyarsenides of the rare-earth metals. [(Cp-2 '' Sm)(mu,eta(4) :eta(4)-As-4)(Cp*Fe)] is also the first d/f-triple decker sandwich complex with a purely inorganic planar middle deck. The central As-4(2-) unit is isolobal with the 6p-aromatic cyclobutadiene dianion (CH)(4)(2-). [(Cp-2 '' Sm)(2)As-7(Cp*Fe)] contains an As-7(3-) cage, which has a norbornadiene-like structure with two short As-As bonds in the scaffold. DFT calculations confirm all the structural observations. The As-As bond order inside the cyclo As-4 ligand in [(Cp-2 '' Sm)(mu,eta(4) :eta(4)-As-4)(Cp*Fe)] was estimated to be in between an As-As single bond and a formally aromatic As-4(2-) system.
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