An electron-transporting anion prepared by anchoring a sulfonate group onto an electron-transporting molecule through a flexible alkyl chain and its use as the counter anion in a cationic iridium complex is reported. The flexible alkyl chain improves the solubility of the bulky anion in water or in polar organic solvents. The anion exhibits similar photophysical and electrochemical properties to the parent electron-transporting molecule. Within the complex, the anion does not disturb the phosphorescence of the cation in the solid film. Solution-processed small-molecule organic light-emitting diodes (OLEDs) using the complex as the dopant show superior performances over the reference device using the conventional complex with a PF6 - counter anion. It is revealed that anchoring anionic groups to optoelectronically active molecules with flexible alkyl chains is a feasible approach to develop optoelectronically active anions for assembling ion pairs with advanced optoelectronic properties.

中文翻译：

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通过烷基链将磺酸盐基团锚定到电子传输分子上，并将其用作抗磷阴离子阳离子铱络合物中的阴离子。

据报道，通过将磺酸盐基团通过挠性烷基链锚定在电子传输分子上而制备的电子传输阴离子及其在阳离子铱络合物中作为抗衡阴离子的用途。柔性烷基链改善了大块阴离子在水中或在极性有机溶剂中的溶解度。阴离子显示出与母体电子传输分子相似的光物理和电化学性质。在配合物中，阴离子不会干扰固体膜中阳离子的磷光。使用该配合物作为掺杂剂的固溶处理小分子有机发光二极管（OLED）与使用常规配合物和PF6-抗衡阴离子的参比器件相比，显示出优异的性能。