p<i>K</i><sub>a</sub> Values and Geometries of Secondary and Tertiary Amines Complexed to Boronic AcidsImplications for Sensor Design
作者:Sheryl L. Wiskur、John J. Lavigne、Hassan Ait-Haddou、Vincent Lynch、Yu Hung Chiu、James W. Canary、Eric V. Anslyn
DOI:10.1021/ol0156805
日期:2001.5.1
[structure in text] The pK(a) values and the geometries of secondary and tertiary amines adjacent to boronic acids were determined using potentiometric and (11)B NMR titrations. The studies showed that the secondary ammonium ion has a pK(a) similar to that of the tertiary ammonium species, which leads to the formation of tetrahedral boron centers at pH values above approximately 5.5. Therefore, secondary
[文字结构]使用电位滴定法和(11)B NMR滴定法测定硼酸附近的仲胺和叔胺的pK(a)值和几何形状。研究表明,仲铵离子的pK(a)与叔铵物种的pK(a)相似,这导致在pH值大于5.5时形成四面体硼中心。因此,当仲胺和叔胺放置在硼中心附近时,可用于在中性pH下生成四面体硼酸以进行二醇络合。