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The hexaphosphaferrocene complex [Fe(η 5 -P 3 C 2 tBu 2 ) 2 ] (1) derived from the corresponding 1,2,4-triphosphospholyl anion reacts with CuX (X = Cl, Br, I) in a 1 : 1 stoichiometry to give the isostructural, one-dimensional polymeric compounds [{Cu(μ 3 -X)} 4 {Fe(μ,η 5 :η 1 -P 3 C 2 tBu 2 ) 2 } 2 ]n (X = Cl (2), Br (3), I (4)), which display a unique sinusoidal (CuX)n ladder structure. In the reaction with CuI a second one-dimensional polymeric compound [{Cu 3 (μ-I)(μ 3 -I) 2 }(CH 3 CN){Fe(μ,η 5 :η 1 - P 3 C 2 tBu 2 )(μ 3 ,η 5 :η 1 -P 3 C 2 tBu 2 )}]n (5) is formed. The reaction of 1 with CuX (X= Cl, Br, I) in a 1 : 2 stoichiometric ratio leads only in the case of CuCl to the formation of the new, oligomeric compound [{Cu(μ 3 -Cl)} 4 (CH 3 CN) 2 {Fe(μ,η 5 :η 1 -P 3 C 2 tBu 2 ) 2 } 2 ] (6), whereas in the case of CuBr and CuI the polymeric compounds 3 and 5 were isolated. The reaction of 1 with Ag[Al{OC(CF 3 ) 3 } 4 ] in a 1:1 stoichiometric ratio results in the formation of [Ag{Fe(μ,η 5 :η 1 -P 3 C 2 tBu 2 ) 2 } 2 ][Al{OC(CF 3 ) 3 } 4 ] (7), which shows dynamic behaviour in solution

Hexaphosphaferrocene [Fe(η 5 -P 3 C 2 tBu 2 ) 2 ] as a Connecting Moiety in Oligomeric and Polymeric Compounds