[(Ethylenediamine)Pt(uracilate)]<sub>4</sub>, a Metal Analogue of Calix[4]arene. Coordination and Anion Host−Guest Chemistry Related to Its Conformational Dynamics
作者:Jorge A. R. Navarro、Matthias B. L. Janik、Eva Freisinger、Bernhard Lippert
DOI:10.1021/ic9808394
日期:1999.2.1
efficient ligand for additional metal ions through the oxo-surface formed by the four O(2) exocyclic atoms of the uracil nucleobases. As shown here, 1b-4H(+) can incorporate a single metal ion only, giving rise to the formation of species of type [(en)PtU](4)M}(X)(n)() with M = Zn(II) (2a), Be(II) (3) (not isolated in the solid state), and La(III) (4); X = NO(3), SO(4)/2; n = 2, 3. In addition, both the protonated
打开的“分子盒” [(en)Pt(UH-N(1),N(3))](4)(NO(3))(4)(其中en = 1,2-二氨基乙烷,UH =尿嘧啶单阴离子)在结构和溶液动力学方面类似于杯芳烃[4]芳烃。它在固态(1a)中采用1,3-交替构象,但在溶液中和去质子化后成为[(en)Pt(UN(1),N(3))](4),这是第二种主要物质(圆锥形适体(1b-4H(+)))发生。1b-4H(+)充当通过尿嘧啶核碱基的四个O(2)外环原子形成的氧代表面的其他金属离子的有效配体。如此处所示,1b-4H(+)只能结合单个金属离子,从而导致形成[(enPtU](4)M}(X)(n)()类型的物质,其中M = Zn(II)(2a),Be(II)(3)(未分离为固态)和La(III)(4);X = NO(3),SO(4)/ 2;n = 2,3。此外,圆锥形构形体的两个质子化物种(1b,根据(1)H NMR研究推导,pH