Synthesis and Structure Determination of the Linear Conjugated Polyynyl and Polyynediyl Iron Complexes Fp*−(C⋮C)n−X (X = H (n= 1, 2); X = Fp* (n= 1, 2, 4); Fp* = (η⁵-C₅Me₅)Fe(CO)₂)¹

A series of polyynyl and polyynediyl complexes of iron, Fp*−(C⋮C) n −H [ n = 2 ( 3 )) and Fp*−(C⋮C) n −Fp* ( n = 2 ( 4 ), 4 ( 5 ); Fp* = (η 5 -C 5 Me 5 )Fe(CO) 2 ), have been prepared, and their linear structure has been confirmed by X-ray crystallography.