Abstract
The halide bridged complexes [ Cp ∗ RuBr 2] n and [(COD)Rh(μ-X)] 2 (X = Cl, Br) react with tetrabromodiazocyclopentadiene C 5Br 4N 2 to give the pentahalocyclopentadienyl complexes Cp ∗Ru[C 5Br 5] ( 1a) and either [C 5Br 4Cl]Rh(COD) ( 2a) or [C 5Br 5]Rh (COD) ( 2b), respectively. Treatment of C 5Cl 4N 2 with [Cp ∗RuBr] 4 or [(COD)Rh(μ-Br)] 2 yields the analogous complexes L nM [C 5Cl 4Br] ( L nM = Cp ∗Ru ( 1b), (COD)Rh ( 2e)) in high yield. A crystal structure determination of 2b shows the cyclopentadienyl ligand in an unusual η 1, η 4-bonding fashion. Crystals of 2b are orthorhombic, space group Pnma,α = 10.86(2), b = 12.841(5), c = 11.972(4) A ̊ , V = 1670(3) A ̊ 3, Z = 4, R1 = 5.81%, wR2 = 14.22% .
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