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Electrochemically Directed Synthesis of Cobalt(II) and Nickel(II) TCNQF 2 1–/2– Coordination Polymers: Solubility and Substituent Effects in the TCNQF n (n=0, 1, 2, 4) Series of Complexes
Australian Journal of Chemistry ( IF 1.0 ) Pub Date : 2020-09-01 , DOI: 10.1071/ch20187
Nguyen T. Vo , Alan M. Bond , Lisandra L. Martin

The reversible diffusion controlled cyclic voltammetry for the reduction of TCNQF­n0/1–/2– (where n = 0, 1, 2, 4) changes significantly on addition of Co2+ and Ni2+ transition metal ions (M2+) because the kinetics associated with electrocrystallisation of the resulting coordination polymers [M(TCNQF2)2(H2O)2] and [M(TCNQF2)] are rapid on the voltammetric time scale. The voltammetry of solutions containing M2+ and TCNQF­2 was undertaken in acetonitrile (0.1 M Bu4NPF6) at both GC and ITO electrodes. New one electron reduced TCNQF2 materials prepared via electrochemically directed synthesis were shown to have the formula [M(TCNQF2)2(H2O)2], assessed by vibrational (IR and Raman) spectroscopy, elemental analysis and thermogravimetric analysis. The solubility of [Ni(TCNQF2)2(H2O)2] (Ksp = 8.29 × 10−11 M3) was significantly higher than the [Co(TCNQF2)2(H2O)2] (Ksp = 1.43 × 10−11 M3). Cyclic voltammetric data suggest the electrocrystallisation of two phases of [Ni(TCNQF2)2(H2O)2] occurs, which is not evident for [Co(TCNQF2)2(H2O)2]. Electrocrystallisation of the highly insoluble [M(TCNQF2)] was achieved at low M2+ and TCNQF2 concentrations. A comparison with published data on the voltammetry of TCNQF­n (n = 0, 1, 2 and 4) for the series of TCNQF­n (n = 0, 1, 2 and 4) containing M2+ is provided. An assessment of the electronic impact of the fluorine substituent of the underlying redox reactions also is established. Predictions are made for the voltammetric behaviour expected for the other transition metal cations with reduced TCNQFn derivatives.



中文翻译:

电化学指导的钴(II)和镍(II)TCNQF 2 1– / 2–配位聚合物的合成:TCNQF n(n = 0,1,2,4)系列配合物中的溶解度和取代基效应

可逆扩散控制循环伏安法用于还原TCNQF的Ñ 0 / 1- / 2- (其中Ñ  = 0,1,2,4)显著改变上添加Co 2+和Ni 2+的过渡金属离子(M 2+)是因为与所得配位聚合物[M(TCNQF 22(H 2 O)2 ]和[M(TCNQF 2)]电结晶相关的动力学在伏安时间尺度上是快速的。含M溶液的伏安2+和TCNQF 2的乙腈溶液中进行的(0.1M卜4 NPF 6)在GC和ITO电极上。通过电化学定向合成制备的新的一种电子还原的TCNQF 2材料显示具有式[M(TCNQF 22(H 2 O)2 ],通过振动(IR和拉曼)光谱,元素分析和热重分析进行评估。[Ni(TCNQF 22(H 2 O)2 ](K sp  = 8.29×10 -11 M 3)的溶解度显着高于[Co(TCNQF 22(H 2 O)2 ](Ksp  = 1.43×10 -11  M 3)。循环伏安数据表明[Ni(TCNQF 22(H 2 O)2 ]的两相发生电结晶,这对于[Co(TCNQF 22(H 2 O)2 ]并不明显。在低M 2+和TCNQF 2浓度下实现了高度不溶[M(TCNQF 2)]的电结晶。与公开的数据上TCNQF的伏安法的比较ÑÑ  = 0,1,2和4)为系列TCNQF的ÑÑ = 0、1、2和4)包含M 2+。还建立了对潜在的氧化还原反应的氟取代基的电子影响的评估。对具有减少的TCNQF n衍生物的其他过渡金属阳离子的伏安行为进行了预测。

更新日期:2020-09-09
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