Preparation and Single-Crystal X-Ray Structures of Four Related Mixed-Ligand 4-Methylpyridine Indium Halide Complexes

Abstract We describe the structures of four related indium complexes obtained during synthesis of solid-state materials precursors. Indium adducts of halides and 4-methylpyridine, InX 3 (pic) 3 (X = Cl, Br; pic = 4-methylpyridine) consist of octahedral molecules with meridional (mer) geometry. Crystals of mer -InCl 3 (pic) 3 ( 1 ) are triclinic, space group P 1(bar) (No. 2), with a = 9.3240(3), b = 13.9580(6), c = 16.7268 (7) A, α = 84.323(2), β = 80.938(2), γ = 78.274(3)°, Z = 4, R = 0.035 for 8820 unique reflections. Crystals of mer -InBr 3 (pic) 3 ( 2 ) are monoclinic, space group P 21/ n (No. 14), with a = 15.010(2), b = 19.938(2), c = 16.593(3), β = 116.44(1)°, Z = 8, R = 0.053 for 4174 unique reflections. The synthesis and structures of related compounds with phenylsulfide (chloride) ( 3 ) and a dimeric complex with bridging hydroxide (bromide) ( 4 ) coordination is also described. Crystals of trans -In(SC 6 H 5 )Cl 2 (pic) 3 ( 3 ) are monoclinic, space group P 21/ n (No. 14), with a = 9.5265(2), b = 17.8729(6), c = 13.8296(4), β = 99.7640(15)°, Z = 4, R = 0.048 for 5511 unique reflections. Crystals of [In(µ-OH)Br