Dihydro-nium hexa-kis[bromido/chlorido(0.75/0.25)]dicadmate(II)-triphenyl-phosphine oxide (1/6)

In the salt, (H(3)O)(2)[Cd(2)Br(4.5)Cl(1.5)]·6C(18)H(15)OP, the hydro-nium cation forms short O-H⋯O hydrogen bonds to the O atoms of the triphenyl-phosphine oxide units. The centrosymmetric dinuclear anion has two halide atoms functioning in a bridging mode, which confers tetra-hedral coordination to the Cd atom. The three independent halide atoms are each a mixture of bromide and chloride; the occupancies of the Br atoms are 0.6434 (11), 0.7468 (11) and 0.8598 (11).