Single crystals of ammonium lead iodide, NH4PbI3, have been obtained by solid-state reactions. Each PbII ion is coordinated by six I− ions in a distorted octahedral environment. PbI6 octahedra are connected by common edges, forming a one-dimensional anion chain. All atoms except one H atom in a general position have site symmetry m.
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Fan et al. (2007) studied this question.