Abstract

Ferrocene-decorated cellulosic materials are usually obtained via a couple of synthetic procedures, which might possibly affect their degree of substitution. In this work, two ferrocene-decorated cellulose esters, connected either by monocarboxylate or by dicarboxylate linkers, have been prepared via one-step reactions by means of esterifying microcrystalline cellulose (MCC) with ferrocenemonocarboxylic acid and 1,1’-ferrocenedicarboxylic acid (FcDA), respectively. Successful surface modification has been confirmed by elemental analysis, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and thermogravimetric measurements. Large retention of the crystalline morphology can be revealed by powder X-ray diffraction, confirming its surface decoration as well. Cyclic voltammetry results of both esters have demonstrated that the winding of the cellulose chains in MCC-FcDA caused by its cross-linking structure might have unfavorable effect for electron transfer, resulting in weaker reversibility of its redox process. Therefore, exploration of a suitable linker might be of great importance to achieve ideal electrochemical properties.

Graphic Abstract

Two ferrocene-decorated cellulose esters connected either by mono or by dicarboxylate linkers have been synthesized via one-step reactions, exhibiting the more electrochemical reversibility of the monocarboxylate-linked ester.

中文翻译：

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接头调控：二茂铁修饰的纤维素的合成及电化学性能

摘要

二茂铁装饰的纤维素材料通常是通过一些合成程序获得的，这可能会影响其取代度。在这项工作中，已通过单步反应通过将微晶纤维素（MCC）与二茂铁单羧酸和1,1'-二茂铁二羧酸（FcDA）酯化来制备两种通过单羧酸酯或通过二羧酸酯连接基连接的二茂铁修饰的纤维素酯）， 分别。通过元素分析，傅立叶变换红外光谱，X射线光电子能谱，扫描电子显微镜和热重测量，已经证实了成功的表面改性。粉末X射线衍射可显示出较大的晶体形态保留，也证实了其表面装饰。两种酯的循环伏安法结果表明，MCC-FcDA中纤维素链的交联结构引起的纤维素链缠绕可能会对电子转移产生不利影响，从而导致其氧化还原过程的可逆性较弱。因此，探索合适的接头对于实现理想的电化学性能可能非常重要。

图形摘要

已经通过一步反应合成了通过单或通过二羧酸酯连接基连接的两种二茂铁修饰的纤维素酯，其显示出单羧酸酯连接的酯的更多的电化学可逆性。