Mesitylindium(III) compounds. X-ray crystal structures of InMes3, [NMe4][InClMes3], and [InClMes2]2

Article abstract of DOI:10.1021/om00111a018

The reaction of InCl₃ with 3 equiv of MesMgBr (Mes = mesityl, 2,4,6-Me₃C₆H₂) yields InMes₃ (1). The molecular structure of 1 consists of discrete monomeric units in which the three mesityl groups are crystallographically inequivalent. The possibility of an agostic C-H?In interaction is discussed. The addition of 1 equiv of Me₄NCl to 1 results in the formation of [Me₄N][InClMes₃] (2). The compounds InClMes₂ (3) and InCl₂Mes (4) were prepared from InMes₃ by means of exchange reactions with InCl₃. The reaction of InMes₃ with 2 equiv of Me₃NHCl yields InCl₂Mes(NMe₃) (5), which slowly redistributes to give a mixture of 4 and InCl₂Mes(NMe₃)₂ (6). The structures of 1, 2, and 3 have been confirmed by X-ray crystallography. InMe₃: monoclinic P2₁/n, a = 8.704 (2) ?, b = 21.888 (6) ?, c = 12.492 (4) ?, β= 95.06 (2)°, Z = 4, observed data 2542, R = 0.0348, R_w = 0.0391. [Me₄N][InClMes₃]·MeCN: monoclinic P2₁/n, a = 16.938 (5) ?, b = 9.154 (5) ?, c = 20.895 (5) ?, β = 94.49 (2)°, Z = 4, observed data 3400, R = 0.0783, R_w = 0.1040. [InClMes₂]₂: monoclinic, P2₁/a, a = 9.113 (2) ?, b = 16.083 (4) ?, c = 12.360 (3) ?, β = 109.90 (2)°, Z = 2, observed data 1824, R = 0.0449, R_w = 0.0658.