[BeCl(12‐Krone‐4)][SbCl 4 ]: Ein neuer kationischer Berylliumkomplex

[BeCl(12‐Crown‐4)][SbCl 4 ]: A Novel Cationic Beryllium Complex Beryllium chloride reacts in dichloromethane suspension in the presence of the equimolar amount of 12‐crown‐4 with antimony pentachloride exothermically to give [BeCl(12‐crown‐4)][SbCl 4 ] ( 1 ), which is characterized by IR spectroscopy and by single crystal structure determination. Space group P2 1 /c, Z = 8, lattice dimensions at 193 K: a = 1116.4(2), b = 1735.4(2), c = 1709.8(3) pm, β = 91.31(1)°, R 1 = 0.0301. 1 contains cations [BeCl(12‐crown‐4)] + with coordination number five at the beryllium atom, and polymeric anions $\rm [SbCl_{4}^{\phantom{\infty}-}]{\infty}$ , forming zigzag chains along [001] with coordination number five at the antimony atoms, thus showing the steric effect of the lone pair. 1 can also be obtained by using the twofold amounts of 12‐crown‐4 and antimony pentachloride, however, accompanied by forming [SbCl 3 (12‐crown‐4)] ( 2 ). With respect to the wrong crystal structure determinations previously reported in the literature, we solved the X‐ray structure of 2 in the space group P2 1 /c, Z = 4, lattice dimensions at 173 K: a = 1191.4(1), b = 783.7(1), c = 1489.7(2) pm, β = 90.83(1)°, R 1 = 0.0243.