Copper Complexes of New Benzodioxotetraaza Macrocycles with Potential Applications in Nuclear Medicine
作者:Patricia Antunes、Rita Delgado、Michael G. B. Drew、Vitor Félix、Helmut Maecke
DOI:10.1021/ic062172o
日期:2007.4.1
the copper center in the CuL1 complex adopts a square-pyramidal geometry with the four nitrogen atoms of the macrocycle forming the equatorial plane and a water molecule at axial position, and the copper in the CuL2 complex is square-planar. Several labeling conditions were tested, and only H2L2 could be labeled with 67Cu efficiently (>98%) in mild conditions (39 degrees C, 15 min) to provide a slightly
两个新颖的苯并二氧杂四氮杂大环[2,9-dioxo-1,4,7,10-四氮杂双环[10.4.0] 1,11-hexadeca-1(11),13,15-三烯(H2L1)和2,10-二氧杂通过[1 + 1]蟹状环化反应合成了-1,4,8,11-四氮杂双环[11.4.0] 1,12-heptadeca-1(12),14,16-三烯(H2L2)]。两种配体的质子化常数通过1 H NMR滴定和25.0摄氏度下在KNO3中0.10 M离子强度下的电位计确定。后一种方法也用于确定其铜(II)配合物的稳定性常数。这些研究表明,CuL1配合物的热力学稳定性比CuL2低得多,并且H2L2对铜(II)表现出优异的亲和力,这是由于铜(II)很好地嵌入了腔中。新型配体的铜配合物通过溶液中的电子光谱和晶体X射线衍射进行表征。这些研究表明,CuL1配合物中的铜中心采用正方形-金字塔形的几何结构,其中大环的四个氮原子形成