Correlated Coordination and Redox Activity of a Hemilabile Noninnocent Ligand in Nickel Complexes
作者:Alexa Paretzki、Martina Bubrin、Jan Fiedler、Stanislav Záliš、Wolfgang Kaim
DOI:10.1002/chem.201304316
日期:2014.4.25
The compound [Ni(QM)2], QM=4,6‐di‐tert‐butyl‐N‐(2‐methylthiomethylphenyl)‐o‐iminobenzoquinone, is a singlet diradical species with approximately planar configuration at the tetracoordinate metal atom and without any NiS bonding interaction. One‐electron oxidation results in additional twofold NiS coordination (dNiS≈2.38 Å) to produce a complex cation of [Ni(QM)2](PF6) with hexacoordinate NiII and
化合物[镍(Q中号)2 ],Q中号= 4,6-二-叔丁基- ñ - (2- methylthiomethylphenyl) - Ô -iminobenzoquinone,是与大致平面结构的单峰双自由基物种以四配位金属原子而且没有任何镍硫键相互作用。在附加的双重镍的单电子氧化反应结果的协整(ð镍小号≈2.38埃),以产生[镍(Q的配合物阳离子中号)2 ](PF 6)用六配位的Ni II和两个明显不同的链节配置的三齿配体。中性前体中的O,O'-反式排列更改为阳离子中的O,O'-顺式配置。[Ni(Q M)2 ](PF 6)的EPR信号具有非常大的g各向异性,并且磁测量表明S = 3/2状态。该指示剂在结构上表征为[Ni(Q M)2 ](ClO 4)2,以显示出与单阳离子相似的NiN 2 O 2 S 2骨架。然而,根据公式[Ni,两个三齿(O,N,S)配体现在是等效的II(Q M 0)2 ]