N-bonding vs. S-bonding in thiocyanato-copper(II) complexes
摘要:
Three mononuclear thiocyanato-Cu(II) complexes have been synthesized: the mono-thiocyanato [Cu(cyclentpam)(NCS)]ClO4 center dot 3H(2)O (1) and [Cu(DPA)(NCS)ClO4] (2), and the dithiocyanato complex Cu(bdmpzpy)(NCS)(2) (3), where cyclen-tpam = 1,4,7,10-tetrakis(propionamide)-1,4,7,10-tetraazacyclododecane, DPA = bis(2-pyridylmethyl)amine, and bdmpzpy = 2,6-bis[(2,5-dimethyl-1-pyrazolyl)methyl]pyridine. The single crystal X-ray crystallography of the complexes confirmed the perfect square pyramidal geometry (SP) in 1 and distorted SP geometry in 2 and 3 with N-bonding coordination mode for the thiocyanato ligands. The IR spectra of the complexes which were consistent with the N-bonding coordination mode of the thiocyanate group(s) and the visible spectra which revealed the square pyramidal geometry around the central Cu2+ ion were in complete agreement with the X-ray structural determination. (C) 2011 Elsevier B.V. All rights reserved.
NITROGEN-RICH MACROCYCLIC LIGANDS, CHELATION COMPLEXES THEREOF, AND PROCESS FOR SELECTIVE CHELATION OF RADIOACTIVE BISMUTH IONS WITH THE LIGANDS
申请人:Los Alamos National Security, LLC
公开号:US20150344508A1
公开(公告)日:2015-12-03
Selective chelation of bismuth radionuclide ions from a mixture including actinium radionuclide ions involves exposing a ligand to an aqueous solution that includes bismuth radionuclide ions and actinium radionuclide ions under conditions whereby the bismuth radionuclide ions selectively chelate to the ligand for form cationic complexes of the bismuth radionuclide ions. and separating the cationic complexes of the bismuth radionuclide ions from the actinium radionuclide ions. The ligands have a structure based on a 12-membered cyclen ring and may include pendant functional groups that can be derivatized with biological targeting vectors for targeted alpha therapy.
Nitrogen-rich macrocyclic ligands, chelation complexes thereof, and process for selective chelation of radioactive bismuth ions with the ligands
申请人:Los Alamos National Security, LLC
公开号:US10450336B2
公开(公告)日:2019-10-22
Selective chelation of bismuth radionuclide ions from a mixture including actinium radionuclide ions involves exposing a ligand to an aqueous solution that includes bismuth radionuclide ions and actinium radionuclide ions under conditions whereby the bismuth radionuclide ions selectively chelate to the ligand for form cationic complexes of the bismuth radionuclide ions. and separating the cationic complexes of the bismuth radionuclide ions from the actinium radionuclide ions. The ligands have a structure based on a 12-membered cyclen ring and may include pendant functional groups that can be derivatized with biological targeting vectors for targeted alpha therapy.