(C5H6.16N2Cl0.84)(IO2Cl2): a birefringent crystal featuring unprecedented (IO2Cl2)− anions and π-conjugated organic cations,Chemical Science

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(C5H6.16N2Cl0.84)(IO2Cl2): a birefringent crystal featuring unprecedented (IO2Cl2)− anions and π-conjugated organic cations
Chemical Science ( IF 7.6 ) Pub Date : 2023-11-27 , DOI: 10.1039/d3sc05770d
Qian-Qian Chen _{1,

2} , Chun-Li Hu ₁ , Ming-Zhi Zhang _{1,

2} , Jiang-Gao Mao _{1,

2}

Affiliation

Birefringent crystals can manipulate the polarization state of lasers and have vital application in polarizers, optical isolators, phase compensators, etc. The design and synthesis of crystals with large birefringence remains a challenging task. To design crystals with large birefringence, we combine an unprecedented chloroiodate(V) group (IO₂Cl₂)⁻ featuring large polarizability anisotropy and a strong stereochemically active lone pair (SCALP) with the π-conjugated 2-amino-5-chloropyridine group. The superior synergy effect of (IO₂Cl₂)⁻ and 2-amino-5-chloropyridine groups produces a new birefringent crystal, namely (C₅H_6.16N₂Cl_0.84)(IO₂Cl₂). It exhibits remarkably large birefringence of 0.67 at 546 nm, far exceeding those of most visible birefringent materials reported. This work discovers the first chloroiodate(V) group and provides a new synthetic route for birefringent materials.

中文翻译：

(C5H6.16N2Cl0.84)(IO2Cl2)：一种双折射晶体，具有前所未有的 (IO2Cl2)− 阴离子和 π 共轭有机阳离子

双折射晶体可以调控激光的偏振态，在偏振器、光隔离器、相位补偿器等方面具有重要的应用。大双折射晶体的设计和合成仍然是一项具有挑战性的任务。为了设计具有大双折射的晶体，我们将前所未有的氯碘酸盐（ V ）基团（IO ₂ Cl ₂ ） ^-具有大的极化率各向异性和强立体化学活性孤对电子对（SCALP）与π-共轭2-氨基-5-氯吡啶基团相结合。 (IO ₂ Cl ₂ ) ^-和2-氨基-5-氯吡啶基团的优异协同效应产生了一种新的双折射晶体，即(C ₅ H _6.16 N ₂ Cl _0.84 )(IO ₂ Cl ₂ )。它在 546 nm 处表现出非常大的双折射，达到 0.67，远远超过报道的大多数可见双折射材料。该工作发现了第一个氯碘酸盐( V )基团，为双折射材料的合成提供了一条新路线。

更新日期：2023-12-01

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