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Anion Recognition by Aliphatic Helical Oligoureas

机译:脂肪族螺旋低聚脲对阴离子的识别

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Anion binding properties of neutral helical foldamers consisting of urea type units in their backbone have been investigated. (HNMR)-H-1 titration studies in various organic solvents including DMSO suggest that the interaction between aliphatic oligoureas and anions (CH3COO-, H2PO4-, Cl-) is site-specific, as it largely involves the urea NHs located at the terminal end of the helix (positive pole of the helix), which do not participate to the helical intramolecular hydrogen-bonding network. This mode of binding parallels that found in proteins in which anion-binding sites are frequently found at the N-terminus of an -helix. (HNMR)-H-1 studies suggest that the helix of oligoureas remains largely folded upon anion binding, even in the presence of a large excess of the anion. This study points to potentially useful applications of oligourea helices for the selective recognition of small guest molecules.
机译:已经研究了在其骨架中由脲类单元组成的中性螺旋折叠剂的阴离子结合性能。 (HNMR)-H-1在各种有机溶剂(包括DMSO)中的滴定研究表明,脂族低聚脲和阴离子(CH3COO-,H2PO4-,Cl-)之间的相互作用是位点特异性的,因为它主要涉及位于末端的尿素NHs螺旋的末端(螺旋的正极),不参与螺旋分子内氢键网络。这种结合平行模式是在蛋白质中发现的,该蛋白质的阴离子结合位点通常在-螺旋的N端。 (HNMR)-H-1研究表明,即使在阴离子过量存在的情况下,寡聚体的螺旋在结合阴离子后仍能在很大程度上折叠。这项研究指出了寡聚螺旋体对小客体分子的选择性识别的潜在有用应用。

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