Octabutylthiophthalocyaninatoiron(ii): electrochemical properties and interaction with cyanide
作者:Kenneth Ozoemena、Tebello Nyokong
DOI:10.1039/b111429h
日期:2002.4.9
The preparation of the thiol-derivatised iron(II) phthalocyanine (FePc) complex, 2,3,9,10,16,17,23,24-octabutylthiophthalocyaninatoiron(II), FePc(SC4H9)8, is described. Electrochemical data obtained by both cyclic voltammetry and Osteryoung square wave voltammetry in DMF showed four redox couples. Kinetics and equilibrium measurements for the interaction of cyanide with FePc(SC4H9)8 at 25.0 ± 0.5 °C in both DMSO and DMF are reported. Gradual spectroscopic changes were only observed for the formation of the dicyano complex, [(CN)2FePc(SC4H9)8]2−. This complex is formed with equilibrium constants, K, of (6.8 ± 0.8) × 102 dm3 mol−1 in DMF and (1.3 ± 0.2) × 103 dm3 mol−1 in DMSO. Pseudo-first-order rate constants, k4r,
were also estimated to be (1.9 ± 0.1) × 10−2 and (8.2 ± 0.3) × 10−2 dm3 mol−1 s−1 in DMF and DMSO, respectively. These results agree with the weak electron-donating properties of the peripheral butylthio-substituents on the phthalocyanine ring and the O-bonded trans DMF.
本文介绍了硫醇衍生化酞菁铁(II)(FePc)络合物 2,3,9,10,16,17,23,24-octabutylthiophthalocyaninatoiron(II), FePc(SC4H9)8 的制备过程。在 DMF 中通过循环伏安法和 Osteryoung 方波伏安法获得的电化学数据显示了四种氧化还原偶。报告了氰化物与 FePc(SC4H9)8 在 25.0 ± 0.5 °C、DMSO 和 DMF 中相互作用的动力学和平衡测量结果。仅在形成二氰络合体 [(CN)2FePc(SC4H9)8]2- 时观察到了渐变的光谱变化。该复合物的平衡常数 K 在 DMF 中为 (6.8 ± 0.8) × 102 dm3 mol-1,在 DMSO 中为 (1.3 ± 0.2) × 103 dm3 mol-1。在 DMF 和 DMSO 中,伪一阶速率常数 k4r 也分别估计为 (1.9 ± 0.1) × 10-2 和 (8.2 ± 0.3) × 10-2 dm3 mol-1 s-1。这些结果与酞菁环上外围丁硫基取代基和反式 DMF 中 O 键的弱电子负载特性相吻合。