Electrocatalytic Oxidation of Formate with Nickel Diphosphine Dipeptide Complexes: Effect of Ligands Modified with Amino Acids
作者:Brandon R. Galan、Matthew L. Reback、Avijita Jain、Aaron M. Appel、Wendy J. Shaw
DOI:10.1002/ejic.201300751
日期:2013.10.14
A series of nickel bis-diphosphine complexes with dipeptides appended to the ligands were investigated for the catalytic oxidation of formate. Typical rates of ~7 s-1 were found, similar to the parent complex (~8 s-1), with amino acid size and positioning contributing very little to rate or operating potential. Hydroxyl functionalities did result in lower rates, which were recovered by protecting the
研究了一系列带有附加到配体的二肽的镍双二膦配合物用于甲酸盐的催化氧化。发现了~7 s-1 的典型速率,类似于母体复合物(~8 s-1),氨基酸大小和定位对速率或操作潜力的贡献很小。羟基官能团确实导致较低的速率,这可以通过保护羟基来恢复。结果表明,由二肽引入的整体电介质在催化中没有发挥重要作用,但游离羟基确实影响活性,表明来自分子内或分子间相互作用的贡献。这些观察结果对于深入了解类酶外配位球对分子催化剂的影响非常重要。这项工作由美国能源部基础能源科学、化学科学、地球科学和生物科学部(BRG、AJ、AMA、WJS)、美国能源部基础能源科学、物理生物科学计划(MLR)资助。太平洋西北国家实验室由巴特尔为美国能源部运营。