K2Na(I3O8)3: a promising mid-infrared birefringent material with two different structures of octaoxotriiodate(v) polyanions

An alkali metal polyiodate, K2Na(I3O8)3, has been synthesized via a hydrothermal method using phosphoric acid as the reaction medium. The compound features two distinct octaoxotriiodate(v) polyanions, which adopt divergent structural configurations due to the disparate arrangements of their lone ele...

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Published inNew journal of chemistry Vol. 49; no. 15; pp. 6103 - 6108
Main Authors Min-Quan, Lin, Meng-Fan, Duan, Jiang-Gao, Mao, Bing-Ping, Yang
Format Journal Article
LanguageEnglish
Published Cambridge Royal Society of Chemistry 07.04.2025
Subjects
Alkali metals
Birefringence
Optical properties
Phosphoric acid
Polyelectrolytes
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Summary:An alkali metal polyiodate, K2Na(I3O8)3, has been synthesized via a hydrothermal method using phosphoric acid as the reaction medium. The compound features two distinct octaoxotriiodate(v) polyanions, which adopt divergent structural configurations due to the disparate arrangements of their lone electron pairs. The material exhibits noteworthy optical properties, including a considerable band gap (3.89 eV), a substantial transmission range (0.27–12.67 μm), and a remarkable birefringence (0.283 at 546 nm). Notably, this material exhibits the highest reported birefringence among inorganic polyiodates to date. These findings position K2Na(I3O8)3 as a promising candidate for mid-infrared birefringent applications.
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ISSN:1144-0546
1369-9261
DOI:10.1039/d5nj00763a