Group 10 complexes containing phosphinomethylamine ligands: Synthesis, structural analysis and electrochemical studies
作者:Nolan W. Waggoner、Lindsay S. Spreer、Brian J. Boro、Daniel L. DuBois、Monte L. Helm
DOI:10.1016/j.ica.2011.07.001
日期:2012.1
The reaction of [M(triphos)OTf](OTf) (M = Pd, Pt; triphos = (Ph2PCH2CH2)(2)PPh; OTf = triflate) with one equivalent of a diphenylphosphinomethylamine ligand ((PNPh(R))-N-Ph2, R = Ph or Me) leads to the formation of the M(II) complexes [Pd(triphos)(PNPh(R))-N-Ph2](OTf)(2) (1a, R = Ph; 1b, R = Me) and [Pt(triphos)(PNPh(R))-N-Ph2](OTf)(2) (2a, R = Ph; 2b, R = Me). Complexes 1a, 1b, 2a and 2b were obtained in moderate yields and characterized by elemental analysis, H-1, C-13, P-31 NMR and X-ray diffraction. The redox behavior of these complexes shows a reversible reduction wave with half-wave potentials ranging from -1.04 to -1.23 V. Electrocatalytic proton reduction studies demonstrate these complexes function as hydrogen production catalysts with turn over frequencies ranging from 120 to 200 s (1). (C) 2011 Elsevier B. V. All rights reserved.