Lanthanide(III) Complexes of 2-[4,7,10-Tris(phosphonomethyl)-1,4,7,10-tetraazacyclododecan-1-yl]acetic Acid (H<sub>7</sub>DOA3P): Multinuclear-NMR and Kinetic Studies
作者:Mariaâ
Paula Campello、Marina Balbina、Isabel Santos、PrÌemysl Lubal、Radek SÌevcÌÃk、Romana SÌevcÌÃková
DOI:10.1002/hlca.200900176
日期:2009.11
trans‐H6DO2A2P but lower than that of H8DOTP. Based on multinuclear‐NMR spectroscopy, the protonation sequence for H7DOA3P was also tentatively assigned. Three protonation constants (pKMHL, pKMH2L, and pKMH3L) were determined for the lanthanide complexes, and the values found are relatively high, although lower than the protonation constants of the related ligand (pK, pK, and pK), indicating that the coordinated
2- [4,7,10-三(膦酰基甲基)-1,4,7,10-四氮杂环十二烷-1-基]乙酸(H 7 DOA3P)和配合物[Ln(DOA3P)] 4的质子化常数4 −(Ln = Ce,Pr,Sm,Eu和Yb)已通过多核NMR光谱法在pD 2–13.8范围内测定,而没有控制离子强度。在11个质子化步骤中检测到7个(p K = 13.66、12.11、7.19、6.15、5.77、2.99和1.99),发现的值与最近通过电位计确定的H 7 DOA3P以及其他相关值相比较配体。H 7 DOA3P的整体碱度高于H 4 DOTA和trans- H 6 DO2A2P,但低于H 78 DOTP。基于多核NMR光谱学,还初步确定了H 7 DOA3P的质子化序列。确定了镧系元素配合物的三个质子化常数(p K MHL,p K MH2L和p K MH3L),尽管相对于相关配体的质子化常数(p K,p K和p K),表