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作为离子液体的C4mimTf2N和作为分子溶剂的DMF在极性、粘度和配位能力上差别较大,本工作重点研究了C4mimTf2N和DMF作为电化学溶剂对电化学反应的影响。首先使用微电极研究了纯离子液体中FeCl3的电化学行为,发现离子液体中FeCl3的还原分为两步,原因是离子液体中Fe(Ⅲ)存在不同的配位形式。随着Cl-的加入,波形变得单一而且可逆性很好,说明这时候Fe(Ⅲ)基本以FeCl4-的形式存在。以二茂铁(Fc)为内标进行标定得到FeCl4-的还原电位。纯DMF中FeCl3也以不同配位形式存在,表现在稳态伏安图上为两段不同的波形。加入Cl-波形变得单一且稳态电流
C4mimTf2N as an ionic liquid and DMF as a molecular solvent differ greatly in their polarity, viscosity and coordination ability. This work focuses on the influence of C4mimTf2N and DMF as an electrochemical solvent on the electrochemical reaction. Firstly, the electrochemical behavior of FeCl3 in pure ILs was studied by using microelectrode. It was found that the reduction of FeCl3 in ionic liquids was divided into two steps because of the different coordination forms of Fe (Ⅲ) in ionic liquids. With the addition of Cl-, the waveform becomes single and the reversibility is very good, indicating that Fe (Ⅲ) is basically present in the form of FeCl4-. The reduction potential of FeCl4- was calibrated with ferrocene (Fc) as internal standard. Pure DMF FeCl3 also exists in different coordination forms, the performance of the steady-state voltammogram for the two different waveforms. The addition of Cl- becomes a single, steady state current