The preparation and crystal structures of novel perhydrates Ph4X+Hal–·nH2O2: anionic hydrogen-bonded chains containing hydrogen peroxide

Eight novel perhydrates Ph4X+Hal−·nH2O2 (X = P, As; Hal = Cl, Br; n = 0.98–1.90) were prepared and their structures were determined by X-ray crystallography. All the structures are formed by parallel infinite zigzag chains of Ph4X+ cations and hydrogen-bonded anionic chains [(H2O2)x(Hal−)y]∞ (x, y = 1, 2). Hydrogen peroxide is partially substituted by admixed water molecules. Some of the studied perhydrates were found to be isostructural with the related hydrates Ph4X+Hal−·nH2O.