Redox Chemistry of Nickel(II) Complexes Supported by a Series of Noninnocent β-Diketiminate Ligands
作者:June Takaichi、Yuma Morimoto、Kei Ohkubo、Chizu Shimokawa、Takayuki Hojo、Seiji Mori、Haruyasu Asahara、Hideki Sugimoto、Nobutaka Fujieda、Nagatoshi Nishiwaki、Shunichi Fukuzumi、Shinobu Itoh
DOI:10.1021/ic5006693
日期:2014.6.16
reduction of the neutral complexes with decamethylcobaltocene gave the anionic complexes when the ligand has the electron-withdrawing substituent (R = CN, NO2, Br). The generated anionic complexes exhibited EPR spectra due to a doublet species (S = 1/2) but showed no LLIVCT band in the near-IR region. Thus, the reduced complexes are best described as the d9 nickel(I) complexes supported by two anionic β-diketiminate
一系列β-二酮配体的镍配合物(R L –,2-取代的N- [3-(苯基氨基)亚烷基]苯胺衍生物R LH的去质子化形式,R = Me,H,Br,CN和NO 2)已经合成并在结构上表征。AgSbF 6或[Ru III(bpy)3 ](PF 6)3(bpy = 2,2'-联吡啶)对中性配合物[Ni II(R L –)2 ]的单电子氧化产生相应的亚稳态阳离子络合物,由于双峰物质而显示出EPR光谱(S(= 1/2)和在近IR区的特征吸收带归因于配体-配位间隔电荷转移(LLIVCT)。DFT计算表明,镍离子(Ni II)的二价氧化态得以保留,而β-二酮基配体之一被氧化以形成正式的混合价络合物[Ni II(R L –)(R L •)] +。因此,可以通过考虑高自旋镍(II)离子(S = 1)与有机基团(S= 1/2)支持配体。已成功确定其中一种阳离子配合物(R = H)的单晶结构,表明该阳离子配合物中的