Abstract
The donor-acceptor complexes [X-I-C6H5]− with X− = Cl− and Br− have been prepared as tetraphenylphosphonium salts from iodobenzene and PPh4X in acetonitrile solutions. They form colourless single crystals, which were characterized by crystal structure determinations. PPh4[Cl-I-C6H5]: Space group P21/c, Z = 4. Lattice dimensions at -70°C: a = 1301.1(5), b= 1457.0(5), c = 1478.8(5) pm, β = 114.17(3)°. PPh4[Br-I-C6H5]: Space group P21/n, Z = 4. Lattice dimensions at 20°C: a = 1354.9(1), b= 1480.1(2), c = 1375.5(1) pm, β = 106.13(2)°. The halide ions are coordinate at the iodine atom of the iodobenzene molecule in a linear arrangement [X-I-C6H5]− with bond lengths Cl-I of 327.9 and Br-I of 347.2 pm.
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