Reductive Coupling of Carbonyl Ligands on a Cubane-Type Tetrairon Cluster [Cp 4 Fe 4 (CO) 4 ] or [(MeC 5 H 4 ) 4 Fe 4 (CO) 4 ] To Give an Acetylene-Coordinated Cluster [Cp 4 Fe 4 (HC⋮CH) 2 ] or [(MeC 5 H 4 ) 4 Fe 4 (HC⋮CH) 2 ]

Artigo Revisado por pares

Reductive Coupling of Carbonyl Ligands on a Cubane-Type Tetrairon Cluster [Cp 4 Fe 4 (CO) 4 ] or [(MeC 5 H 4 ) 4 Fe 4 (CO) 4 ] To Give an Acetylene-Coordinated Cluster [Cp 4 Fe 4 (HC⋮CH) 2 ] or [(MeC 5 H 4 ) 4 Fe 4 (HC⋮CH) 2 ]

1998; American Chemical Society; Volume: 120; Issue: 36 Linguagem: Inglês

10.1021/ja980669u

ISSN

1943-2984

Autores

Masaaki Okazaki, Takeo Ohtani, Shinji Inomata, Naohiko Tagaki, Hiroshi Ogino,

Tópico(s)

Organoboron and organosilicon chemistry

Resumo

Treatment of [Cp4Fe4(CO)4] with LiAlH4 in tetrahydrofuran (THF) resulted in the reductive coupling of carbonyl ligands to produce a nonsubstituted acetylene-coordinated cluster [Cp4Fe4(HC⋮CH)2]. X-ray structure analysis revealed that the cluster consists of a puckered rhombus of four iron atoms. The coordination mode of the acetylene ligands was determined to be μ4-η2:η2:η1:η1-HC⋮CH. The cyclic voltammogram of the acetylene-coordinated cluster exhibits three reversible or quasireversible one-electron oxidation waves and one irreversible one-electron reduction wave, corresponding to +3/+2, +2/+1, +1/0, and 0/−1 charged couples, respectively. Similarly, [(MeC5H4)4Fe4(CO)4] reacts with LiAlH4 in THF to give [(MeC5H4)4Fe4(HC⋮CH)2].

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Reductive Coupling of Carbonyl Ligands on a Cubane-Type Tetrairon Cluster [Cp 4 Fe 4 (CO) 4 ] or [(MeC 5 H 4 ) 4 Fe 4 (CO) 4 ] To Give an Acetylene-Coordinated Cluster [Cp 4 Fe 4 (HC⋮CH) 2 ] or [(MeC 5 H 4 ) 4 Fe 4 (HC⋮CH) 2 ]