Metalloradical Compounds with 1,2‐Dipivaloylhydrazido Ligands: Electron Transfer and Alkylation/Protonation Effects
作者:Sudipta Mondal、Vasileios Filippou、Martina Bubrin、Brigitte Schwederski、Jan Fiedler、Wolfgang Kaim
DOI:10.1002/ejic.201900391
日期:2019.6.10
complexes M(bpy)2Cl2, M = Ru or Os, react with 1,2‐dipivaloylhydrazine H2L = tBuC(O)‐NH‐NH‐C(O)‐tBu to yield the paramagnetic compounds [M(L)(bpy)2](PF6) 1(PF6), M = Ru and 2(PF6), M = Os}. Crystal structures of 1(ClO4) and 2(PF6) reveal an NNCO chelate coordination of L with d(NN) ≈ 1.39 Å. EPR spectroscopy suggests a metal/ligand mixed situation for the unpaired electron, with 29 % (Ru, 1+) or 46 %
在氧化条件下,配合物M(bpy)2 Cl 2,M = Ru或Os,与1,2-二苯甲酰肼H 2 L = t BuC(O)-NH-NH-C(O)-t Bu反应生成顺磁性化合物[M(L)(bpy)2 ](PF 6) 1(PF 6),M = Ru和2(PF 6),M = Os}。1(ClO 4)和2(PF 6)的晶体结构显示L与d(NN)≈1.39Å的NNCO螯合配位。EPR光谱表明未成对电子的金属/配体混合情况为29%(Ru,根据DFT计算,金属自旋贡献为1 +或46%(Os,2 +)。既复杂阳离子显示出可逆的单电子氧化还原(ķ ç ≈10 19为1 + 10 12为2 +),这也可通过IR(ν监测CO)和UV /可见-近红外光谱电化学。这些数据证实了金属/配体的轨道混合M II(L · –)↔M III(L 2 –),而analogue类似物则支持后者。Ru(bpy)2 Cl 2的反应在非氧化条件下会生成中间体(1