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The crystal structures of Hg 2 P 3 Br(I) and Hg 2 P 3 Cl(II) have been refined by least-squares full-matrix procedures to  R  = 0.037 (I) and  R  = 0.035 (II). I is orthorhombic, space group  Pbcn ,  a  = 8.014(1) Å,  b  = 8.902(1) Å,  c  = 7.823(1) Å,  Z  = 4. II is monoclinic, space group  C 2/ c ,  a  = 7.834(2) Å,  b  = 8.844(1) Å,  c  = 7.591(1) Å,  β  = 98.68(1),  Z  = 4. Both structures consist of [unk](P 1− ) helical chains running along the  c -direction. The conformation of the chains is the same in I and II but the arrangement of the chains within the unit cells is different. The structures are also compared with those of Cd 2 Z 3 X (X = Cl, Br, I; Z = P, As).

Helical [unk](P 1− ) chains in the structures of Hg 2 P 3 Br and Hg 2 P 3 Cl