(S)-5-(p-Nitrobenzyl)-PCTA, a Promising Bifunctional Ligand with Advantageous Metal Ion Complexation Kinetics
- 16 February 2009
- journal article
- research article
- Published by American Chemical Society (ACS) in Bioconjugate Chemistry
- Vol. 20 (3), 565-575
- https://doi.org/10.1021/bc8004914
Abstract
A bifunctional version of PCTA (3,6,9,15-tetraazabicyclo[9.3.1]pentadeca-1(15),11,13-triene-3,6,9,-triacetic acid) that exhibits fast complexation kinetics with the trivalent lanthanide(III) ions was synthesized in reasonable yields starting from N,N′,N′′-tristosyl-(S)-2-(p-nitrobenzyl)-diethylenetriamine. pH-potentiometric studies showed that the basicities of p-nitrobenzyl-PCTA and the parent ligand PCTA were similar. The stability of M(NO2-Bn-PCTA) (M = Mg2+, Ca2+, Cu2+, Zn2+) complexes was similar to that of the corresponding PCTA complexes, while the stability of Ln3+ complexes of the bifunctional ligand is somewhat lower than that of PCTA chelates. The rate of complex formation of Ln(NO2-Bn-PCTA) complexes was found to be quite similar to that of PCTA, a ligand known to exhibit the fastest formation rates among all lanthanide macrocyclic ligand complexes studied to date. The acid-catalyzed decomplexation kinetic studies of the selected Ln(NO2-Bn-PCTA) complexes showed that the kinetic inertness of the complexes was comparable to that of Ln(DOTA) chelates making the bifunctional ligand NO2-Bn-PCTA suitable for labeling biological vectors with radioisotopes for nuclear medicine applications.Keywords
This publication has 65 references indexed in Scilit:
- Therapeutic Radionuclides: Biophysical and Radiobiologic PrinciplesSeminars in Nuclear Medicine, 2008
- Novel Bimodal Bifunctional Ligands for Radioimmunotherapy and Targeted MRIBioconjugate Chemistry, 2008
- Rational Design and Generation of a Bimodal Bifunctional Ligand for Antibody-Targeted Radiation Cancer TherapyJournal of Medicinal Chemistry, 2007
- Synthesis and Characterization of DOTA‐(amide)4 Derivatives: Equilibrium and Kinetic Behavior of Their Lanthanide(III) ComplexesEuropean Journal of Inorganic Chemistry, 2007
- Development of radioimmunotherapeutic and diagnostic antibodies: an inside-out viewNuclear Medicine and Biology, 2007
- Equilibrium and Formation/Dissociation Kinetics of Some LnIIIPCTA ComplexesInorganic Chemistry, 2006
- Europium(III) complex formed with pyridine containing azamacrocyclic triacetate ligand: characterization by sensitized Eu(III) luminescenceJournal of Photochemistry and Photobiology A: Chemistry, 2003
- The stability of the metal complexes of cyclic tetra-aza tetra-acetic acidsTalanta, 1992
- On the Complex Formation Equilibria Between Indium(III) and Chloride Ions.Acta Chemica Scandinavica, 1972
- A study of some problems in determining the stoicheiometric proton dissociation constants of complexes by potentiometric titrations using a glass electrodeAnalytica Chimica Acta, 1967