It crystallizes in a unique motif. According to X-ray crystallography, some Sn(II) centers are bound to six iodide ligands others Sn(II) sites are distorted.4
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Howie, R. A.; Moser, W.; Trevena, I. C. (1972). "The Crystal Structure of Tin(II) Iodide". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry. 28 (10): 2965–2971. Bibcode:1972AcCrB..28.2965H. doi:10.1107/S0567740872007290. /wiki/Bibcode_(identifier) ↩