Structure of the 1-Ethyl-3-methyl-1-alumina-indane Dimer, [C2H5(O-C6H4CH(CH3)CH2)Al]2

Abstract

Abstract The molecular structure of the 1-ethyl-3-methyl-1-alumina-indane dimer has been determined from single crystal X-ray data collected by counter methods. The compound crystallizes in the monoclinic space group C2h 5-P21/c with a = 14.621(2), b = 8.3967(3), c = 8.7516(5) Å, β = 107.998(4)°, Z = 2 and dc = 1.15 gem-3 . Refinement converged with an R value of 0.037 for the 1836 reflections with I > 3 σ (I). The crystals are composed of discrete dimeric molecules possessing crystallographic 1̄ (Ci) symmetry. Each Al atom bonds to an ethyl C atom, 1.964(2) Å, as well as to alkyl 1.974(2) and aryl 2.168(1) Å C atoms of one monomer and, surprisingly, to the aryl C atom 2.104(1) Å, of the inversion related monomer. The Al-Al′ distance in the dimers is 2.6639(7) Å.