NMR conformational study of diamagnetic complexes of some triazatriacetate macrocycles
作者:Carlos F.G.C. Geraldes、M. Paula M. Marques、A. Dean Sherry
DOI:10.1016/s0020-1693(97)06004-0
日期:1998.5
7-triazacyclodecane-N,N′,N″-triacetic acid (DETA), 1,4,8-triazacycloundecane-N,N′,N″-triacetic acid (UNTA), 1,5,9-triazacyclododecane-N,N′,N″-triacetic acid (DOTRA), and 9,10-benzylidene-1,4,7-triazacyclotridecane-N,N′,N″-triacetic acid, (BUNTA) have triazamacrocyclic rings with different sizes and flexibilities, bearing three pendant acetate arms. In the case of the alkaline-earth, Zn2+ and Cd2+ cations
通过质子核磁共振波谱(1 H NMR)研究了由五个三氮杂三乙酸大环配体与一价(碱性)和二价(碱土,Zn 2+和Cd 2+)阳离子形成的抗磁性配合物的构象性质。溶液随pH和温度的变化而变化。这些与结构相关的三氮杂三乙酸配体,1,4,7-三氮杂环壬烷-N,N',N'' -三乙酸(NOTA),1,4,7-三氮杂环癸烷-N,N',N'' -三乙酸(DETA), -1,4,8- triazacycloundecane- N,N',N“ -三乙酸(UNTA),1,5,9- triazacyclododecane- N,N',N” -三乙酸(DOTRA),和9,10-亚苄基-1,4,7-三氮杂环十三烷-N,N′,N″-三乙酸(BUNTA)具有大小和柔韧性不同的三氮杂大环环,带有三个乙酸酯侧链。在碱土,Zn 2+和Cd 2+阳离子的情况下,对于所有研究的配体,仅检测到一种络合物形式(1:1)。在大多数情况