Coordination Chemistry of the Tris(pentafluoroethyl)stannate(II) Anion, [Sn(C₂F₅)₃]^–

Abstract

In this contribution the syntheses of transition metal complexes of the electron-withdrawing Sn(C 2 F 5 ) 3 ligand are presented. The reaction of HSn(C 2 F 5 ) 3 with organometallics L n M-R (M = Zn, W, Mo; R = Et, Me; L = CO, Cp), metal carbonyls [Ni(CO) 4 ], and [{Fe(CO) 2 Cp} 2 ], as well as chloro complexes such [a] Centrum für Molekulare Materialien,

Pentafluoroethylated Compounds of Silicon, Germanium and Tin

“…For the synthesis of transition metal complexes three applicable synthetic protocols were utilized (Scheme 16). [38,51,60,61] Ini- tially,w ei nvestigated the reaction of salts of tris(pentafluoroethyl)element anions with transition metal chlorides and carbonyl complexes like [Ni(CO) 4 ]( path I). In these reactions the elimination of chloride as well as carbonyl substituents becamea pparent and neutral or monoanionic complexes were formed selectively.F or the more acidic tris(pentafluoroethyl)germanea nd -stannane the formation of tris(pentafluoroethyl)element anions can also be achievedb yi ns itu deprotonation with organo transition metal complexes accompanied by the liberation of the corresponding alkane (path II).…”

“…Ad irectc omparison of the Si(C 2 F 5 ) 3 ,G e(C 2 F 5 ) 3 and Sn(C 2 F 5 ) 3 substituents in the related complexes [Fe(CO) 2 Cp{E(C 2 F 5 ) 3 }] and [Ni(CO) 3 {E(C 2 F 5 ) 3 }] À (E = Si, Ge, Sn) reveals only am arginally different effect of the three ligands. [51,60,61] However, their carbonyl vibration bandsa re shifted by 50-128 cm À1 towards higher wavenumbers in comparison to non-fluorinated derivatives like [Fe(CO) 2 Cp(SnBu 3 )] (n(CO) = 1989 cm À1 ), [Fe(CO)(py)Cp(GeEt 3 )] (n(CO) = 1960 cm À1 ) and [Fe(CO)(PEt 3 )Cp(SiEt 3 )] (n(CO) = 1909 cm À1 ). [62] 7.3.…”