Zwitterionic macrocyclic metal sulfate extractants containing 3-dialkylaminomethylsalicylaldimine units
作者:Paul G. Plieger、Peter A. Tasker、Stuart G. Galbraith
DOI:10.1039/b313078a
日期:——
which allow loading of CuSO(4) at pH approximately 4 and easy stripping to recycle the ligand. X-Ray structure determinations of the Cu(II) and Ni(II) sulfate complexes of the tert-butyl substituted ligand suggest that the de-tuning of M(2+)-binding results from a distortion from planarity of the "salen" N(2)O(2)(2-) donor set imposed by the incorporation of the hexamethylene strap in the ligand and reveal
10,25-二叔烷基-14,21-二甲基-3,6,14,21-四氮杂三环[21.3.1.18,12] octaco sa-1(27),2,6,8,10,12( 28),23,25-辛烯-27,28-二醇大环形成Ni(II)和Cu(II)络合物,其中金属阳离子和硫酸根阴离子以配体的两性离子形式结合在分开的位置。与开链类似物相比,壬基取代的大环化合物对SO(4)(2-)的亲和力更高,对Cu(2+)的结合力更低,其pH依赖性在一定范围内,从而允许负载CuSO(4) )在大约4的pH值下,易于汽提以回收配体。叔丁基取代配体的Cu(II)和Ni(II)硫酸盐配合物的X射线结构测定表明,M(2+)结合的失谐是由“ salen”的平面性引起的