[C5H12N]2SnBr6: a lead-free phase transition compound with switchable quadratic nonlinear optical properties,Materials Chemistry Frontiers

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[C5H12N]2SnBr6: a lead-free phase transition compound with switchable quadratic nonlinear optical properties
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2023-02-08 , DOI: 10.1039/d2qm01340a
Xinxin Hu _{1,

2} , Haojie Xu _{1,

2} , Wuqian Guo _{1,

2} , Shiguo Han ₁ , Yi Liu ₁ , Yu Ma _{1,

2} , Qingshun Fan _{1,

2} , Junhua Luo ₁ , Zhihua Sun _{1,

3}

Affiliation

Solid-state phase transition materials with tunable quadratic nonlinear optical (NLO) properties under different states hold great potential applications in a wide range of fields. Despite great efforts, lead-free organic–inorganic hybrid NLO switchable materials are still scarce. Here, we report a new lead-free organic–inorganic hybrid compound (NMP)₂SnBr₆ (1, where NMP is N-methylpyrrolidinium) which adopts the zero-dimensional perovskite-like motif. It demonstrates a structural phase transition at T_c = 352 K, as confirmed by differential scanning calorimetry and specific heat measurements. Single-crystal structure analyses at different temperatures indicate the occurrence of symmetry breaking from Pbam (at 360 K, > T_c) to Pba2 (at 300 K, < T_c), which can be attributed to the configuration changes of organic N-methylpyrrolidinium cations. In particular, 1 shows remarkable NLO signal contrast up to ∼25 and excellent switching stability after multiple heating–cooling cycles, suggesting its potential application as a switchable NLO material. This work paves the way for exploring new organic–inorganic hybrid functional materials.

中文翻译：

[C5H12N]2SnBr6：具有可切换二次非线性光学特性的无铅相变化合物

在不同状态下具有可调谐二次非线性光学（NLO）特性的固态相变材料在广泛领域具有巨大的应用潜力。尽管付出了巨大努力，但无铅有机-无机杂化 NLO 可切换材料仍然稀缺。在这里，我们报告了一种新的无铅有机-无机杂化化合物 (NMP) ₂ SnBr ₆（1，其中 NMP 是N -甲基吡咯烷），它采用零维类钙钛矿基序。它展示了T _c处的结构相变= 352 K，由差示扫描量热法和比热测量证实。不同温度下的单晶结构分析表明，从Pbam（在 360 K，> T _c）到Pba 2（在 300 K，< T _c）发生对称性破缺，这可归因于有机N -的构型变化甲基吡咯烷阳离子。特别是，在多次加热-冷却循环后， 1显示出高达 ~25 的显着 NLO 信号对比度和出色的切换稳定性，表明其作为可切换 NLO 材料的潜在应用。这项工作为探索新型有机-无机杂化功能材料铺平了道路。

更新日期：2023-02-08

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