Chiral Diaminodiamide Copper(II) Complexes for the Enantioselective Recognition of Amino Acids: Synthesis of the Ligands and Formation Constants
作者:Elisabetta Armani、Rosangela Marchelli、Arnaldo Dossena、Giuseppe Casnati、Francesco Dallavalle
DOI:10.1002/hlca.19860690818
日期:1986.12.10
-bis(aminoacyl)propanediamines (AA-NN-2 and AA-NN-3, respectively, AA = alanine, phenylalanine, valine) were synthesized as the dihydrochlorides, and their complexes with Cu(II) studied potentiometrically. Since these ligands in the presence of Cu(II) are able to perform chiral resolution of D,L-dansylamino acids in HPLC (reversed phase), in a certain pH range (6.5–8.5), it is important to know the equilibria existing
(S,S)-N,N'-双(氨基酰基)乙烷-和(S,S)-N,N'-双(氨基酰基)丙烷二胺(分别为AA-NN-2和AA-NN-3 =丙氨酸,苯丙氨酸,缬氨酸)合成为二盐酸盐,并用电位法研究了它们与Cu(II)的配合物。由于这些配体在Cu(II)存在下能够在一定pH范围(6.5-8.5)中在HPLC(反相)中进行D,L-丹酰氨基酸的手性拆分,因此重要的是要知道存在的平衡在水溶液中的配体和铜之间。对于AA-NN-2,有四种,CuLH 3+,CuL 2 +,Cu 2检测到L 2 H和CuLH -2,而对于AA-NN-3,仅发现CuLH 3+,CuL 2+和CuLH -2。目的是找出识别过程中可能涉及哪些复合体。