Die Kristallstruktur von [BeCl2(15‐Krone‐5)]

Crystal Structure of BeCl₂(15‐Crown‐5)] Single crystals of BeCl₂(15‐crown‐5)] ( 1 ) were obtained from dichloromethane solutions of BeCl₂ in the presence of the equivalent amount of 15‐crown‐5 and characterized by IR spectroscopy and X‐ray diffraction. Space group P2₁/c, Z = 4, lattice dimensions at 100 K: a = 1036.2(1), b = 1071.1(1), c = 1360.1(1) pm, β = 109.86(1)°, R₁ = 0.0225. The structure determination shows no disorder, all hydrogen positions were refined isotropically. The results are in contrast to the previously reported crystal structure determination in the space group P2₁nb. The beryllium atom of 1 forms a BeO₂C₂ five‐membered heterocycle with terminal chlorine atoms to give a distorted tetrahedral coordination with distances Be–O 166.5(2), 169.9(2) pm, and Be–Cl 195.8(2), 197.8(2) pm. The structural results are in good agreement with DFT calculations on B3LYP/6‐311+G** level.