Gadolinium(III) Complexes of dota-DerivedN-Sulfonylacetamides (H4(dota-NHSO2R)=10-{2-[(R)sulfonylamino]-2-oxoethyl}-1,4,7,10-tetraazacyclododecane-1,4,7-triacetic Acid): A New Class of Relaxation Agents for Magnetic Resonance Imaging Applications
作者:Silvio Aime、Mauro Botta、Giancarlo Cravotto、Luca Frullano、Giovanni?B. Giovenzana、Simonetta Geninatti?Crich、Giovanni Palmisano、Massimo Sisti
DOI:10.1002/hlca.200590041
日期:2005.3
properties of the corresponding Gd3+ complexes were investigated as a function of pH and temperature. These complexes have relaxivities in the range 4.5–5.3 mM−1 s−1, at 20 MHz and 25°, and are characterized by a single H2O molecule in their inner coordination sphere. The mean residence lifetime of this molecule is relatively long (500–700 ns) compared to other anionic complexes. The slow rate of H2O exchange
合成了基于H 3 do3a(= 1,4,7,10-四氮杂环十二烷-1,4,7-三乙酸)结构并带有一个N-磺酰基乙酰胺臂的四个镧系离子的新配体,即H 4 dota- NHSO 2 R = 10- 2-[(R)磺酰基氨基] -2-氧代乙基} -1,4,7,10-四氮杂环十二烷-1,4,7-三乙酸1a – e。对一个这样的配体的15 N标记的Eu 3+配合物1d的15 N-NMR研究表明,N-磺酰基乙酰胺臂的配位涉及羰基O原子而不是N原子。相应Gd的弛豫特性研究了3+配合物随pH和温度的变化。这些配合物在20 MHz和25°时具有4.5–5.3 mM -1 s -1范围内的弛豫度,其特征是在其内部配位域中存在单个H 2 O分子。与其他阴离子络合物相比,该分子的平均停留寿命相对较长(500-700 ns)。H 2 O交换的缓慢速度可以通过N-磺酰基乙酰胺臂上负电荷的广泛离域来证明。配位的H 2