从新开发的中间体7设计并合成了新型带状卟啉受体Zn1,其中结合了两个富电子的双(对-亚苯基)-34-冠醚-10单元,用于研究分子识别的新化学。1 H NMR和UV-Vis研究表明,Zn1与中性电子缺陷的萘-1,8,4,5-四羧基二酰亚胺(NDI)衍生物13(没有观察到简单的络合化学计量),19(K a = 48(±5)M -1)和30(K a = 46(±5)M在氯仿-d中为-1,与吡啶衍生物25的结合力强,在氯仿中(K a = 1.5(±0.12)×10 3 M -1),对四阳离子化合物35 ·4PF 6(K a =丙酮-d 6中的475(±50)M -1,与化合物22的结合力非常强(K a = 6.5(±0.7)×10 5 M -1,由一个吡啶和两个NDI单元组成,呈氯仿形式。通过比较Zn1和适当设计的客体之间的络合行为,观察到了复杂Zn1 · 22中分子间金属-配体配位和供体-受体相互作用的显着协同作用。配合物Zn1
UV–vis study in polar methanol has revealed that Zn1 is able to selectively recognize sodiumcyanide over potassiumcyanide (the ratio of their binding constant is ca. 56), whereas Zn2 exhibits a higher binding affinity for potassiumcyanide over sodiumcyanide (the ratio of their binding constant is ca. 12). In contrast, both receptors display substantially weaker binding affinity for sodium thiocyanate
Metalloporphyrin receptors for histidine-containing peptides
作者:Hui Liu、Zhan-Ting Li
DOI:10.1016/j.cclet.2014.03.034
日期:2014.5
Two new ditopic metalloporphyrin receptors constructed by combining metalloporphyrin with crown ethers have been prepared and characterized. H-1 NMR and MS spectra confirmed the complexation of receptor with peptide driven by coordination interaction and hydrogen bonding. UV/vis experiments revealed that the receptors exhibited high binding affinity to histidine-containing peptides. These receptors could differentiate short peptides of C-terminal histidine and N-terminal histidine and formed the most stable complexes with tripeptide. (C) 2014 Hui Liu. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.