Indium(III) and Gallium(III) Complexes of Bis(aminoethanethiol) Ligands with Different Denticities: Stabilities, Molecular Modeling, and <i>in Vivo</i> Behavior
作者:Yizhen Sun、Carolyn J. Anderson、Tammy S. Pajeau、David E. Reichert、Robert D. Hancock、Ramunas J. Motekaitis、Arthur E. Martell、Michael J. Welch
DOI:10.1021/jm9505977
日期:1996.1.1
previous reported ligand for In(III). The stability constants of the complexes of 4SS, 5SS, 6SS, and the analogous ligand EDDASS, N,N'-bis(2-mercaptoethyl) ethylenediamine-N,N'-diacetic acid, which does not contain gem-dimethyl groups, are compared. The thermodynamic stabilities of the In(III) complexes of all ligands except 6SS are greater than those of the corresponding Ga(III) complexes. The presence
Ga(III)和In(III)放射性核素的配合物广泛用于诊断成像。在这项研究中,分别制备了下列密度分别为4、5和6的配体:N,N'-双-(2,2-二甲基-2-巯基乙基)乙二胺(4SS),1-羧基-N-N' -双(2,2-二甲基-2-巯基乙基)乙二胺(5SS)和N,N′-双(2,2-二甲基-2-巯基乙基)乙二胺-N,N′-二乙酸(6SS)。描述了两个新配体5SS和6SS的合成。In(III)和Ga(III)配合物的平衡常数通过直接法和配体竞争性电位法测定。In(III)-6SS在0.100 M KNO3中在25.0摄氏度下的形成常数(KML = [ML] / [M] [L])为10(39.8),在生理pH(7.4为100%时,其pM) (配体的过量)为30.9。这些值高于以前报道的任何其他In(III)配体值。4SS,5SS,6SS和类似配体EDDASS,N,N'-双(2-巯基乙基)乙二胺-