A new irreversible solvatochromic Zn-nanopaper has been produced through the coordination-driven assembly of Zn(II)-terpyridine complex (Zn-tpy) on the surface of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized cellulose nanofibril (tCNF). The Zn-tpy as a photoactive center exhibits a changed emission color from greenish-blue to yellow after coordination with the carboxylate anion on the surface of tCNF. Theoretic calculations support that the longer wavelength emission is the result of a metal–ligand charge transfer. When exposed to solvents and then dried, the coordination bond between the Zn-tpy and tCNF experienced a dynamic, reversible process, where the lowest-energy excited state emitted by the Zn-tpy was “inverted”, which is a typical phenomenon of irreversible solvatochromism. The shifts of the emission colors of the Zn-nanopaper appeared result from its exposure to specific solvents and occurred in a matter of minutes. After solvent exposure, it was found that the emission colors of the nanopaper are not recovered to its original state. The different emissive Zn-nanopapers are easily prepared by post-processing using a solvatochromic process. This highly transparent Zn-nanopaper with post-processable emission offers unprecedented potential applications in the areas of memory devices, fluorescent switches, and organic light-emitting diodes (OLEDs).

中文翻译：

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Zn（II）联吡啶和氧化纳米原纤化纤维素的不可逆溶剂变色锌纳米纸。

通过在2,2,6,6-四甲基哌啶-1-氧基（TEMPO）-氧化纤维素纳米原纤维（tCNF）。与tCNF表面的羧酸根阴离子配位后，作为光敏中心的Zn-tpy的发射颜色从绿蓝色变为黄色。理论计算支持更长的波长发射是金属-配体电荷转移的结果。当暴露于溶剂中然后干燥时，Zn-tpy和tCNF之间的配位键经历了动态的，可逆的过程，其中Zn-tpy发出的最低能量激发态被“反转”，这是不可逆的典型现象。溶剂变色。Zn-纳米纸的发射颜色的变化是由于其暴露于特定溶剂而引起的，并且在几分钟内就发生了。在暴露于溶剂之后，发现纳米纸的发射颜色没有恢复到其原始状态。通过使用溶剂变色法的后处理，可以轻松制备不同的发射性Zn纳米颗粒。这种高度透明的Zn-纳米纸具有可后处理的发射特性，在存储设备，荧光开关和有机发光二极管（OLED）领域提供了空前的潜在应用。通过使用溶剂变色法的后处理，可以轻松制备不同的发射性Zn纳米颗粒。这种高度透明的Zn-纳米纸具有可后处理的发射特性，在存储设备，荧光开关和有机发光二极管（OLED）领域提供了空前的潜在应用。通过使用溶剂变色法的后处理，可以轻松制备不同的发射性Zn纳米颗粒。这种高度透明的Zn-纳米纸具有可后处理的发射特性，在存储设备，荧光开关和有机发光二极管（OLED）领域提供了空前的潜在应用。