Novel Iron(III) Porphyrazine Complex. Complex Speciation and Reactions with NO and H<sub>2</sub>O<sub>2</sub>
作者:Alexander Theodoridis、Joachim Maigut、Ralph Puchta、Evgeny V. Kudrik、Rudi van Eldik
DOI:10.1021/ic702041g
日期:2008.4.1
The complex [iron(III) (octaphenylsulfonato)porphyrazine] (5-), Fe (III)(Pz), was synthesized. The p K a values of the axially coordinated water molecules were determined spectrophotometrically and found to be p K a 1 = 7.50 +/- 0.02 and p K a 2 = 11.16 +/- 0.06. The water exchange reaction studied by (17)O NMR as a function of the pH was fast at pH = 1, k ex = (9.8 +/- 0.6) x 10 (6) s (-1) at 25 degrees
合成了配合物[铁(III)(八苯基磺酰基)卟啉](5-),铁(III)(Pz)。分光光度法测定轴向配位的水分子的p K a值,发现其为p K a 1 = 7.50 +/- 0.02和p K a 2 = 11.16 +/- 0.06。通过(17)O NMR研究的水交换反应在pH = 1时快速,在25°C下,k ex =(9.8 +/- 0.6)x 10(6)s(-1),并且太快,无法在pH = 10时测量,而在pH = 13时,没有发生水交换反应。研究了在酸性pH下,单价和二价铁(III)(Pz)配合物与Fe(III)(Pz)配合物之间的平衡,该平衡是温度和压力的函数。研究了具有不同亲核试剂(Br(-)和吡唑)的络合物形成平衡,以便区分五价铁(对于Br(-))或六价铁(对于吡唑)还是三价铁(III)。中央。研究了Fe(III)(Pz)与NO反应的动力学,作为在各种pH值下的模型配体取代反应。