[CH₃(CH₂)₁₁NH₃]SnI ₃ : A Hybrid Semiconductor with MoO₃-type Tin(II) Iodide Layers

The organic-inorganic hybrid [CH₃(CH₂) ₁₁NH₃]SnI₃ presents a lamellar structure with a Sn-I framework isotypic to that of MoO₃. The SnI₃ ^- layer consists of edge and corner-sharing SnI₆ octahedra in which one of the six Sn-I bonds is distinctly elongated (e.g., 3. 62 Å), indicating lone-pair stereoactivity for the Sn(II) atom. The overall electronic character remains comparable with that of the well-studied SnI₄ ^2--based perovskite semiconductors, such as [CH ₃(CH₂)₁₁NH₃]₂SnI ₄, with a red-shifted and broadened exciton peak associated with the band gap, apparently due to the increased dimensionality of the Sn-I framework. The title compound offers, aside from the hybrid perovskites, a new type of solution-processable Sn-I network for potential applications in semiconductive devices.