Trichloroberyllat‐Komplexe von Dimethylcyanamid, Morpholin und 4,4′‐Bipyridin

Abstract

AbstractTrichloroberyllate Complexes of Dimethyl Cyanamide, Morpholine, and 4,4′‐BipyridineThe trichloroberyllate complexes (Ph4P)[BeCl3(NCNMe2)] (1), (Ph4P)[BeCl3{HN(CH2)4O}] (2), and (Ph4P)2[(BeCl3)2(4,4′‐bipy)] (3) were prepared by reactions of (Ph4P)2[Be2Cl6] with dimethyl cyanamide, trimethylsilylmorpholinate, and 4,4′‐bipyridine, respectively, in dichloromethane solutions. 1‐3 were characterized by X‐ray crystallography and by IR‐spectroscopy.1·CH2Cl2: Space group P1, Z = 1, lattice dimensions at 173 K: a = 714.2(1), b = 919.5(2), c = 1233.4(2) pm, α = 94.97(1)°, β = 90.86(1)°, γ = 111.90(1)°, R1 = 0.0310. In the complex anion [BeCl3(NCNMe2)]− the dimethyl cyanamide ligand is coordinated via a linear Be–N≡C‐NMe2 arrangement, the CH2Cl2 molecules forming linear chains by hydrogen bridges ···HCH···Cl··· with the chlorine atoms of the {BeCl3−} groups.2: Space group $P{\bar 1}$, Z = 2, lattice dimensions at 173 K: a = 1050.9(1), b = 1099.7(1), c = 1308.3(2) pm, α = 87.57(1)°, β = 70.97(1)°, γ = 74.58(1)°, R1 = 0.0397. The complex anions are dimerized by centrosymmetric puckered eight‐membered [Be–N–H···Cl]2 rings.3·2CH2Cl2: Space group $P{\bar 1}$, Z = 2, lattice dimensions at 173 K: a = 1095.4(1), b = 1559.6(2), c = 1869.8(3) pm, α = 79.12(1)°, β = 73.83(1)°, γ = 78.76(1)°, R1 = 0.0548. The complex contains dianions [Cl3Be(μ‐bipy)BeCl3]2− with Be–N distances of 177.0(6) and 178.5(6) pm. Both {BeCl3}− groups form C–H···Cl hydrogen bridges with the dichloromethane molecules.