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Reversible four-color electrochromism triggered by the electrochemical multi-step redox of Cr-based metallo-supramolecular polymers

机译:由CR基金属 - 超分子聚合物的电化学多步氧化还原引发的可逆四色电致荧光

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Four color electrochromism (yellow, magenta, blue, and navy) has been achieved in Cr( III )-based metallo-supramolecular polymers ( polyCr ), which were synthesized by 1?:?1 complexation of Cr ions and 1,4-di[[2,2′:6′,2′′-terpyridin]-4′-yl]benzene (L). The polymer structure was determined by X-ray absorption fine structure (XAFS) measurement and X-ray photoelectron spectroscopy (XPS). The molecular weight of polyCr was calculated as 3.2 × 10 ~(7) Da using right angle light scattering (RALS). The EXAFS fitting indicated that the bond distances of Cr–N are 2.020 ? and 2.208 ?. A film of polyCr shows multi-color electrochromism (EC) or absorption: a sharp peak at 380 nm at 0 V vs. Ag/Ag ~(+) (yellow), a sharp peak at 510 nm and a broad peak at 800 nm at ?0.6 V vs. Ag/Ag ~(+) (magenta), a broad peak at 610 nm and between 700–900 nm at ?1.2 V vs. Ag/Ag ~(+) (blue), a broad peak between 450–900 nm at ?1.8 V vs. Ag/Ag ~(+) (navy). The transmittances change (Δ T ), the switching times for coloring and bleaching ( T _(c) , T _(b) ) and the coloration efficiency ( η _(c) , η _(b) ): [Δ T , ( T _(c) , T _(b) ), ( η _(c) , η _(b) )] were [39.2%, (5.56 s, 1.39 s), (169 cm ~(2) C ~(?1) , 230 cm ~(2) C ~(?1) )] at 510 nm between ?0.6 and 0.2 V vs. Ag/Ag ~(+) , [67.0%, (6.93 s, 2.52 s), (138 cm ~(2) C ~(?1) , 172 cm ~(2) C ~(?1) )] at 610 nm between ?1.2 and 0.2 V vs. Ag/Ag ~(+) , [86.1%, (6.80 s, 3.03 s), (167 cm ~(2) C ~(?1) , 134 cm ~(2) C ~(?1) )] at 780 nm between ?1.8 and 0.2 V vs. Ag/Ag ~(+) , respectively, during the cycles. The durability experiment indicates that polyCr shows an EC property for at least 100 cycles.
机译:在Cr(III)的金属 - 超分子聚合物(Polycr)中已经实现了四种彩色电致变色(黄色,品红色,蓝色和海军),该聚合物(Polycr)被1×1〜1的络合和1,4-DI合成[2,2':6',2'' - Terpyridin] -4'-Y1]苯(1)。通过X射线吸收细结构(XAF)测量和X射线光电子谱(XPS)测定聚合物结构。使用直角光散射(RALS)计算PolyCR的分子量为3.2×10〜(7)Da。 exafs拟合表明cr-n的键距离为2.020?和2.208?。多彩电致变色(EC)或吸收:在0V与Ag / Ag〜(+)(黄色)的380nm处,在510nm处的尖峰和800nm的尖峰峰值在α0.6V与Ag / Ag〜(+)(+)(洋红色),610nm处的宽峰,在700-900nm之间,在Δ1.2V与Ag / Ag〜(+)(蓝色)之间,之间的宽峰450-900 nm at?1.8 V与AG / AG〜(+)(海军)。透射率改变(ΔT),用于着色和漂白的切换时间(t _(c),t _(b))和着色效率(η_(c),η_(b)):[Δt, (t _(c),t _(b)),(η_(c),η_(b))] [39.2%,(5.56 s,1.39 s),(169厘米〜(2)c〜 (α1),230cm〜(2)C〜(α1))]在510nm之间,在α0.6和0.2V与Ag / Ag〜(+)之间,[67.0%,(6.93 s,2.52 s), (138厘米〜(2)C〜(α1),172cm〜(2)C〜(α1))在Δ1.2和0.2V与Ag / Ag〜(+)之间以610nm,[86.1%] ,(6.80 s,3.03 s),(167厘米〜(2)c〜(?1),134cm〜(2)c〜(Δ1))]在780nm之间,在Δ1.8和0.2 V与AG /分别在循环期间分别为Ag〜(+)。耐久性实验表明Polycr显示4个额外的EC属性。

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