K₆Sn₄F₁₂I₂•0.5H₂O: a zero-dimensional alkali metal tin mixed halide compound exhibiting color change due to crystal water loss

Abstract

A new zero-dimensional alkali-metal tin mixed halide, K₆Sn₄F₁₂I₂•0.5H₂O, is synthesized by a hydrothermal method. It crystallizes in the cubic centrosymmetric space group of Fd-3m (No. 227) and its structure consists of crystal water molecules and ordered arranged [Sn₄F₁₂I₄] fundamental structural blocks trapped in [K₁₈] cages. Interestingly, K₆Sn₄F₁₂I₂•0.5H₂O exhibits a color change from colorless to orange when exposed to air. Experimental measurements combined with theoretical calculations reveal that the color change in K₆Sn₄F₁₂I₂•0.5H₂O is attributed to the loss of crystal water.

Keywords

Metal halide / color change / new material exploration

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