A 3D metal halide framework in the organic-inorganic compound (H3N(CH2)2SS(CH2)2NH3)3Pb5I16

A organic-inorganic hybrid compound, namely (H3N(CH2)(2)SS(CH2)(2)NH3)(3)Pb5I6, was synthesized from the reaction of lead iodide, cystamine chloride, and concentrated hydriodic acid in ethanol under solvothermal condition. According to the results of X-ray single crystal structural analysis, its 3D inorganic framework was constructed from lead iodide octahedra in corner-, edge- or face-sharing mode, which can be considered as connected staircase-like sheets. Disordered cystamine molecules are located both in the cages defined between two consecutive steps of the staircase-like network and in the channels formed by 10 adjacent bridged PbI6 octahedra. The formation and high stability of such a unique 3D metal halide network can be partly attributed to the unusual weak interactions between disulfides and iodides (d(S center dot center dot center dot I) approximate to 3.55 angstrom) in the structure. Monoclinic, space group: C2/c, a = 35.396(2) angstrom, b = 8.984(1) angstrom, c = 22.623(2) angstrom, beta = 120.66(2)degrees, V = 6188.1(9) angstrom(3), Z = 4. (C) 2007 Elsevier Masson SAS. All rights reserved.