Selenide and selenolate compounds of indium: a comparative study of In–Se bond-forming reactions

Abstract

A range of In–Se bond-forming reactions have been investigated, including insertion of selenium into either an In–C or In–S bond, reaction of an indium halide with a magnesium selenolate and via chlorosilane elimination. The reaction of InBu^t₃ with Se yielded [Bu^t₂In(µ-SeBu^t)]₂ and [Bu^tIn(µ₃-Se)]₄. In contrast, In(CMe₂Et)₃ and InBuⁿ₃ with Se preferentially formed [(Me₂EtC)In(µ₃-Se)]₄ and [BuⁿIn(µ₃-Se)]₄, respectively. The reaction of In(CMe₂Et)₃ with Te yielded [(Me₂EtC)In(µ₃-Te)]₄]. The compound [Bu^tIn(µ₃-Se)]₄ is also formed from the reaction of [Bu^t₂In(µ-SBu^t )]₂ with either Se or Se=PPh₃, while both it and [Bu^tIn(µ-SeBu^t )]₂ may be prepared from [Bu^t₂In(µ-Cl)]_n and (Bu^tSe)MgCl. Similarly, [Buⁿ₂In(µ-SeBu^t )]₂ may be prepared from [Buⁿ₂In(µ-Cl)]₂. However, the reaction of [(Me₂EtC)₂In(µ-Cl)]₂ with (Bu^tE)MgCl (E = S, Se or Te) yielded [(Me₂EtC)In(µ₃-E)₄ ]. Reaction of [Bu^t₂M(µ-Cl)]_n (M = In or Ga) with Se(SiMe₃ )₂ yielded the silylselenolate compounds [Bu^t₂M(µ-SeSiMe₃ )]₂ . The various In–Se bond-forming reactions are compared. The molecular structures of [Bu^t₂In(µ-EBu^t)]₂ (E = S or Se) have been determined by X-ray crystallography.

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