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Urea-Based Macrocycle Selective for Sulfate and Structurally Sensitive to Water

机译:基于尿素的宏观循环选择性硫酸盐,对水结构敏感

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摘要

An unsymmetrical semirigid tetraurea macrocycle, 1, selectively traps SO42- with high affinity in a 0.5% water:DMSO-d(6) solution (K-a = 90,500 M-1). The macrocycle displays somewhat less affinity for HSO4- (Ka = 68,600 M-1), while Kas for OAc- and H2PO4- are approximately half that seen for SO42- (49,800 and 52,600 M-1, respectively). Cl- binds weakly (K-a = 3430 M-1), and essentially no affinity is observed for NO3-. Structural results for the SO42- and Cl- complexes indicate 1:1 1:anion complexes, with encapsulation of the SO42- but not for Cl-ion, which hovers at the macrocyclic periphery. For the ditopic biphenyl-4,4 '-dicarboxylate, each carboxylate binds to its own macrocycle in a sandwich-like mode, which shows a 2:1 1:dianion association. Binding studies indicate 1:1 binding for the monotopic anions in the 0.5% water:DMSO-d(6) solutions, but as the water content of the solvent is increased, the binding mode changes to a 2:1 1:anion association according to the binding studies in solution. Binding studies indicate that 1 maintains a significant tolerance for water up to 1:1 mixtures of water:DMSO-d(6).
机译:一种不对称的半血管四牛毛酰宏循环,1,选择性地捕获SO42-在0.5%水中具有高亲和力:DMSO-D(6)溶液(K-A = 90,500 m-1)。宏观循环对HSO4-(KA = 68,600 m-1)显示稍微不那么多,而OAC-和H2PO4的KAS分别为SO42-(分别为49,800和52,600 m-1)。弱(k-a = 3430 m-1)束缚(K-a = 3430 m-1),对于NO3-观察到没有亲和力。 SO42和CL-复合物的结构结果表明1:1 1:阴离子复合物,其封装SO42-但不是用于Cl离子,其悬浮在大环周边。对于DITopic Biphenyl-4,4'-二羧酸盐,每种羧酸盐在夹心状模式下与其自身的宏循环结合,其显示为2:1 1:Dianion协会。结合研究表明0.5%水中的单表阴离子的1:1结合:DMSO-D(6)溶液,但随着溶剂的含水量增加,结合模式改变为2:1:阴离子协会溶液中的结合研究。结合研究表明,1对水的显着耐受性高达1:1水混合物:DMSO-D(6)。

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