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Four POM-Viologen Color-Changing Materials with Fast Color Response under Various External Stimuli
Inorganic Chemistry ( IF 4.6 ) Pub Date : 2024-03-20 , DOI: 10.1021/acs.inorgchem.3c04282 Xinxin Hao 1 , Tao Liu 2 , Yang Li 1 , Jun Ying 1 , Aixiang Tian 1 , Mengle Yang 1 , Xiuli Wang 1
Inorganic Chemistry ( IF 4.6 ) Pub Date : 2024-03-20 , DOI: 10.1021/acs.inorgchem.3c04282 Xinxin Hao 1 , Tao Liu 2 , Yang Li 1 , Jun Ying 1 , Aixiang Tian 1 , Mengle Yang 1 , Xiuli Wang 1
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Four kinds of polyoxometalate (POM)-viologen compounds were synthesized by hydrothermal method, namely (1–cby)2·[H2(SiMo12O40)]·2H2O (1), (1–cby)2·[H2(SiW12O40)]·2H2O (2), (1–cby)2·(1,1′–bcby)2·{H4[Co4(H2O)2(PW9O34)2]}·12H2O (3), (1–cby)·(1,1′–bcby)·[H(α–PW11O39)CoII(1–cby)]·8H2O (4) (1–cby·Br = 1–Cyclopropylmethyl–[4,4′]bipyridinyl–1–ium bromide, 1,1′–bcby·Br = 1,1′–Bis-cyclopropylmethyl–[4,4′]bipyridinyl–1–ium bromide). These four POM-viologen compounds exhibit one-dimensional supramolecular network structures. Especially, compound 3 contains a rare sandwich POM subunit {Co4(H2O)2(PW9O34)2}10–. These four compounds can be used as color-changing materials, and they all exhibit noticeable color changes upon exposure to light, heat, and electricity. The discoloration mechanism involves viologen derivatives with electron-deficient properties accepting electrons from POM with electron-rich properties under external stimulation, leading to the formation of viologen free radicals. Among them, compounds 1 and 2 also have good properties for ink-free erasable printing, double anticounterfeiting, and ultraviolet detector because of their rapid color response to ultraviolet (UV) light. In addition, compounds 1–4 also show different color changes in the detection of volatile amines.
中文翻译：
四种在各种外部刺激下具有快速颜色响应的POM-Viologen变色材料
采用水热法合成了四种多金属氧酸盐(POM)-紫罗碱化合物，即(1–cby) 2 ·[H 2 (SiMo 12 O 40 )]·2H 2 O ( 1 )、(1–cby) 2 ·[ H 2 (SiW 12 O 40 )]·2H 2 O ( 2 ), (1–cby) 2 ·(1,1′–bcby) 2 ·{H 4 [Co 4 (H 2 O) 2 (PW 9 O) 34 ) 2 ]}·12H 2 O ( 3 ), (1–cby)·(1,1′–bcby)·[H(α–PW 11 O 39 )Co II (1–cby)]·8H 2 O ( 4 ) (1–cby·Br = 1–环丙基甲基–[4,4′]联吡啶基–1–溴化鎓, 1,1′–bcby·Br = 1,1′–双环丙基甲基–[4,4′ ]联吡啶基-1-溴化鎓）。这四种POM-紫精化合物表现出一维超分子网络结构。特别是，化合物3含有罕见的夹心POM亚基{Co 4 (H 2 O) 2 (PW 9 O 34 ) 2 } 10–。这四种化合物可用作变色材料，它们在暴露于光、热和电时都表现出明显的颜色变化。变色机理涉及具有缺电子特性的紫罗碱衍生物在外部刺激下接受来自具有富电子特性的POM的电子，导致紫罗碱自由基的形成。其中，化合物1和2由于对紫外（UV）光的快速颜色响应，还具有良好的无墨可擦印刷、双重防伪和紫外检测器性能。此外，化合物1 ~ 4在挥发性胺的检测中也表现出不同的颜色变化。
更新日期：2024-03-20
中文翻译：
四种在各种外部刺激下具有快速颜色响应的POM-Viologen变色材料
采用水热法合成了四种多金属氧酸盐(POM)-紫罗碱化合物，即(1–cby) 2 ·[H 2 (SiMo 12 O 40 )]·2H 2 O ( 1 )、(1–cby) 2 ·[ H 2 (SiW 12 O 40 )]·2H 2 O ( 2 ), (1–cby) 2 ·(1,1′–bcby) 2 ·{H 4 [Co 4 (H 2 O) 2 (PW 9 O) 34 ) 2 ]}·12H 2 O ( 3 ), (1–cby)·(1,1′–bcby)·[H(α–PW 11 O 39 )Co II (1–cby)]·8H 2 O ( 4 ) (1–cby·Br = 1–环丙基甲基–[4,4′]联吡啶基–1–溴化鎓, 1,1′–bcby·Br = 1,1′–双环丙基甲基–[4,4′ ]联吡啶基-1-溴化鎓）。这四种POM-紫精化合物表现出一维超分子网络结构。特别是，化合物3含有罕见的夹心POM亚基{Co 4 (H 2 O) 2 (PW 9 O 34 ) 2 } 10–。这四种化合物可用作变色材料，它们在暴露于光、热和电时都表现出明显的颜色变化。变色机理涉及具有缺电子特性的紫罗碱衍生物在外部刺激下接受来自具有富电子特性的POM的电子，导致紫罗碱自由基的形成。其中，化合物1和2由于对紫外（UV）光的快速颜色响应，还具有良好的无墨可擦印刷、双重防伪和紫外检测器性能。此外，化合物1 ~ 4在挥发性胺的检测中也表现出不同的颜色变化。
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