ox). An octahedral Ni II complex [trans-Ni(2c)2] and square-planar Pd II complexes [Pd2bCl2] and [Pd2b ox Cl2] have been prepared. In the two Pd II species, the ligands are coordinated only through their pyrazolyl rings. The fact that [Pd2bC12] and [Pd2b oxC12] are isolable compounds proves that redox transitions involving the p-quinone substituent are fully reversible. In [Pd2b oxCl2], the methine
描述了基于单对位和对位
对苯二酚的双(
吡唑-1-基)
甲烷配体的合成,结构表征和配位行为(即2-(pz2CH)
C6H3(OH)2(2a),2-( pz2CH)-6-(tBu)
C6H2(OH)2(2b),2-(pz2CH)-6-(tBu) (OSiiPr3)(OH)(2c),2,5-(pz2CH)2 (OH) 2(4))。可以以制备规模(2a ox,2b ox,4 ox)将
配体2a,2b和4氧化成它们的
对苯醌状态。制备了八面体的Ni II络合物[trans-Ni(2c)2]和方形Pd II络合物[Pd2bCl2]和[Pd2b ox Cl2]。在两个Pd II物种中,
配体仅通过其
吡唑基环进行配位。[Pd2bC12]和[Pd2b oxC12]是可分离的化合物这一事实证明,涉及对醌取代基的氧化还原转变是完全可逆的。在[Pd2b oxCl2]中,次甲基质子是高酸性的,可以用弱于NEt(3)的