Monomeric arylchromium(II) complexes: the crystal structures of [ cis-Mes 2Cr(THF) 2](THF), [ cis-Mes 2Cr(bipy)](THF), [Mes 4CrLi 2(THF) 2](THF) and Ph 4CrLi 2(THF) 4 (Mes = 2,4,6-mesityl; bipy = 2,2′-bipyridine)

Abstract

The square-planar geometry of the monomeric [Mes 2Cr(THF) 2](THF) ( 1) and [Mes 2Cr(bipy)](THF) ( 2) (Mes = 2,4,6-mesityl; bipy = 2,2′-bipyridine) was determined by X-ray diffraction analysis. Crystal data are as follows. 1: orthorhombic, Pccn with a 12.447(3), b 14.500(2), c 16.593(2) Å), V 2994.7(9) Å 3, Z = 4, R = 0.121, R w = 0.121. 2: Monoclinic, P2 1/ c with a 14.316(2), b 11.071(2), c 17.645(3) Å, β 91.24(1)°, V 2795.9(3) Å 3, Z = 4, R = 0.060, R w = 0.068. Further reaction of 1 with an excess of MesLi or reaction of CrCl 2(THF) 2 with 4 equiv. of PhLi, allows the isolation of the monomeric chromates [Mes 4CrLi 2(THF) 2](THF) ( 3) and Ph 4CrLi 2(THF) 4 ( 4) in crystalline form. Crystal data for 3 and 4 are as follows. 3: orthorhombic, I222 with a 8.703(1), b 14.129(1), c 17.993(1) Å, V 2212.6(3) Å 3, Z = 2, R = 0.052, R w = 0.054. 4: Triclinic, P 1 with a 9.187(1), b 10.263(1), c 10.851(1) Å, α 110.77(1), β 92.16(1), γ 97.48(1)°, V 944.7(2) Å 3, Z = 1, R = 0.059, R w = 0.057.