Nabph4

Unless otherwise specified, all air sensitive manipulations were carried out either in a N2 filled glove box or using standard Schlenk techniques under Ar. Proligand L2 was prepared according to a literature procedure. [23] FeCl2 (Acros), NaPF6 (Alfa Aesar), NaBPh4 (Sigma-Aldrich), and nBu4NPF6 (electrochemical grade, Sigma-Aldrich) were purchased and used without further purification. Organic solvents were dried and distilled using appropriate drying agents prior to use. 1and 2D NMR spectra were recorded on Bruker Avance 300 MHz or Bruker Avance-III 500 MHz spectrometers. 1 H and 13 C{ 1 H} NMR spectra were referenced to residual solvent peaks. Electronic absorption spectra were recorded on an Agilent Technologies Cary 5000 Series UV-Vis-NIR spectrophotometer in dual beam mode (range: 230 -1600 nm). Mössbauer experiments were performed in transmission geometry with a 57 Co in Rh source and a WissEl constant acceleration drive. Spectra were collected at 10 K using a Janis SHI-850 closed-cycle refrigerator and are calibrated relative to a-Fe at room temperature.