Competing Allosteric Mechanisms for Coordination-Directed Conformational Changes of Chiral Stacking Structures with Aromatic Rings
作者:Kohei Nonomura、Junpei Yuasa
DOI:10.1021/acs.inorgchem.9b00665
日期:2019.5.6
revealed that significant asymmetric nonlinear effects can be found in a coordination-directed conformational alteration through competing allosteric mechanisms. Toward this aim, we have prepared new chiral bridging ligands [(S,S)- and (R,R)-Im2An] containing an anthracene ring as a spacer with two ethynyl-linked chiral imidazole groups at the 9,10-positions. The (S,S)- and (R,R)-Im2An ligands (L) spontaneously
这项工作表明,可以通过竞争性变构机制在配位导向的构象变化中发现明显的不对称非线性效应。为此,我们制备了新的手性桥联配体[(S,S)-和(R,R)-Im 2 An],其中含有一个蒽环作为间隔基,在9,10-上有两个乙炔基连接的手性咪唑基团职位。(S,S)-和(R,R)-Im 2 An配体(L)自发地与溶液相中的Zn 2+离子(M)形成组装体,从而得到L 4 M 2通式[(S,S)-或(R,R)-Im 2 An] 4(Zn 2+)2的分子式组装体。NMR研究表明,[(S,S)-Im 2 An] 4(Zn 2+)2组件具有蒽二聚体结构,具有平行位移的几何形状,从而导致相对较小的圆二色性(CD)信号,如预期的那样。非手性物体。相反,随后将手性大肠菌素[(R)-或(S)-Ph-box]添加到[(S,S)-Im 2 An] 4(Zn 2+)2提供了具有通式[(R)-或(S)-Ph-box] 2 [[(S,S)-Im