Syntheses, vibrational spectra and crystal structures of the chloroberyllates (Ph4P)2[BeCl4] and (Ph4P)2[Be2Cl6]

Beryllium dichloride reacts with tetraphenylphosphonium chloride in dichloromethane depending on the molar ratio to give the readily soluble chloroberyllates (Ph4P)(2)[BeCl4] . 2.5CH(2)Cl(2) (1.2.5CH(2)Cl(2)) and (Ph4P)(2)[Be2Cl6].2CH(2)Cl(2) (2.2CH(2)Cl(2)), respectively. Both compounds are characterized by crystal structure determinations. 1.2.5CH(2)Cl(2): Space group P (1) over bar, Z = 2, lattice dimensions at 193 K: a = 1185.7(1), b = 1244.5(1), c = 1939.3(2) pm, alpha = 77.62(1)degrees, beta = 74.13(1)degrees, gamma = 68.17(1)degrees, R-1 = 0.0416. The [BeCl4](2-) ion forms tetrahedra without special site symmetry. 2.2CH(2)Cl(2): Space group P (1) over bar, Z = 1, lattice dimensions at 193 K: a = 985.3(1), b = 1107.6(1), c = 1344.7(1) pm, alpha = 65.45(1)degrees, beta = 79.12(1)degrees, gamma = 78.49(1)degrees, R-1 = 0.0361. The [Be2Cl6](2-) ion forms chloro-bridged double tetrahedra with site symmetry (1) over bar (C-i). Both compounds lose the included dichloromethane in vacuo. The vibrational spectra (IR, Raman) of 1 and 2 are reported.