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The crystal structure of the so-called iodide of Wells “K 3 Pb 2 I 8  · 4H 2 O” (single crystal X-ray methods;  P 4/ mmm ,  a  = 1318.3 pm,  c  = 453.9 pm;  R  F  = 0.025 with 463 unique reflections) is devided in an ordered part K 2 PbI 4  · 2H 2 O and a disordered part 0.237 KI 3  · 0.37 H 2 O. The former is an unexpected simple arrangement of linear chains along [001] of edge-bridged octahedrally coordinated anionic complexes ∞ [PbI 4/2 I 2 ] 2− , cations K  +  and water molecules leaving two different channels parallel to the chains. This is caused by filling up one channel entirely with a onedimensional triiodide chain ∞ (I 3  − ), which is incommensurate with the translation of the former part. The other is partially filled with cations K  +  and water molecules.

zeitschrift für kristallographie - crystalline materials

Bleihalogenide ungewöhnlicher Zusammensetzung und Struktur 1 : Iodid von Wells K 2 PbI 4/2 I 2  · 2 H 2 O ·  x KI 3  ·  y H 2 O ( x  = 0,237,  y  = 0,37)