Abstract [BeCl(12‐Crown‐4)][SbCl4]: 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)][SbCl4] (1), which is characterized by IR spectroscopy and by single crystal structure determination. Space group P21/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)°, R1 = 0.0301. 1 contains cations [BeCl(12‐crown‐4)]+ with coordination number five at the beryllium atom, and polymeric anions [SbCl₄^∞-]∞ , 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 [SbCl3(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 P21/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)°, R1 = 0.0243.
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Neumüller et al. (2006) studied this question.
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