Crystal structure and Hirshfeld analysis of poly[bis( <i>N</i> , <i>O</i> -dimethylhydroxylammonium) [di-μ ₂ -iodido-diiodidoplumbate(II)]]

The title compound, {(C₂H₈NO)₂[PbI₄]} _<i>n</i> , represents a layered organic-inorganic perovskite, crystallizing in space group <i>C</i>2/<i>c</i>. The asymmetric unit comprises one <i>N</i>,<i>O</i>-di-methyl-hydroxyl-ammonium cation, one Pb²⁺ cation located on a twofold rotation axis, and two iodide anions. The Pb²⁺ cation is coordinated by six iodido ligands, generating a slightly distorted octa-hedral {PbI₆} unit. The octa-hedra are connected by corner-sharing of equatorial I^- ligands to form polymeric inorganic sheets extending parallel to the <i>ab</i> plane. These sheets are separated by double layers of the organic cations, producing a typical di-periodic perovskite-type arrangement with stacking of the layers along the <i>c</i> axis. Neighbouring inorganic layers are shifted relative to each other along both the <i>a</i> and <i>b</i> axes. The <i>N</i>,<i>O</i>-di-methyl-hydroxyl-ammonium cation engages in two N-H⋯I hydrogen bonds directed toward axially bound iodido ligands, which consolidates the packing of the crystal structure.