New Monomeric Cobalt(II) and Zinc(II) Complexes of a Mixed N,S(alkylthiolate) Ligand: Model Complexes of (His)(His)(Cys) Metalloprotein Active Sites
作者:SeChin Chang、Vivek V. Karambelkar、Roger D. Sommer、Arnold L. Rheingold、David P. Goldberg
DOI:10.1021/ic010321r
日期:2002.1.1
solid-state structures are retained in solution. Cyclic voltammetry reveals processes for both the Co(II/I) (4, - 1.51 V; 5, - 1.49 V) and Co(III/II) (4, + 0.9 V; 5, + 0.9 V) couples. The UV-vis data for the cobalt complexes are consistent with a monomeric, four-coordinate geometry regardless of the nature of the solvent (i.e., donating (MeOH, CH(3)CN) vs nondonating (CH(2)Cl(2))) and are compared with other
制备了新的N(2)S(烷基硫醇盐)配体2-甲基-1- [甲基-(2-吡啶-2-基乙基)氨基]丙烷-2-硫醇盐,并与锌( II)和钴(II)生成单体络合物[(PATH)ZnBr](2),[(PATHZnZnNCS](3),[(PATHCoBr)](4)和[(PATH)CoNCS]( 5)。已经通过X射线衍射确定了4和5的分子结构。每个配合物在金属中心显示扭曲的四面体几何形状,PATH配体提供N(2)S(烷硫醇)供体。这些复合物是具有His(2)Cys-M(II)位点的金属蛋白活性位点的紧密结构模拟物,例如在肽甲酰化酶中发现的位点。配合物4和5是具有N(2)SL(L不等于N,S)供体组的晶体学表征的Co(II)配合物的第一个实例。在固态下仅观察到一种2-5的非对映异构体,和简单的分子力学(Chem3D)计算表明,这种异构体具有良好的配体构象,因此很稳定。Zn(II)情况下的NMR研究和Co(I