Novel tetra- and hexa-dentate ligands from 6,6′-dicyano-2,2′-bipyridine
摘要:
A simple, direct route from 2,2'-bipyridine to 6,6'-dicyano-2,2'-bipyridine and its conversion to the 6,6'-dithiocarboxamide and various novel tetra- and hexa-dentate ligands such as the 6,6'-bis(4-methyl-thiazol-2-yl) and 6,6'-bis[4-(2-pyridyl)thiazol-2-yl] derivatives have been established. Diaqua[6,6'-bis(4-methylthiazol-2-yl)-2,2'-bipyridine]zinc(II) bis(trifluoromethanesulfonate) has been prepared and its crystal structure determined. The tetra-heterocyclic ligand is planar, binding through two bipyridine nitrogen atoms and, more weakly, through two thiazolyl nitrogen atoms to zinc(ii) which is in a distorted octahedral environment.
Synthesis and Evaluation of Lipophilic BTBP Ligands for An/Ln Separation in Nuclear Waste Treatment: The Effect of Alkyl Substitution on Extraction Properties and Implications for Ligand Design
作者:Frank W. Lewis、Laurence M. Harwood、Michael J. Hudson、Petr Distler、Jan John、Karel Stamberg、Ana Núñez、Hitos Galán、Amparo G. Espartero
DOI:10.1002/ejoc.201101576
日期:2012.3
4- and 4′-positions of the pyridine rings on their extraction properties with LnIII and AnIII cations in simulated nuclear waste solutions have been studied. The speciation of ligand 13 with some trivalent lanthanide nitrates was elucidated by 1H NMR spectroscopic titrations and ESI-MS. Although 13 formed both 1:1 and 1:2 complexes with LaIII and YIII, only 1:2 complexes were observed with EuIII and
Novel tetra- and hexa-dentate ligands from 6,6′-dicyano-2,2′-bipyridine
作者:Paul N. W. Baxter、Joseph A. Connor、W. Bernd Schweizer、John D. Wallis
DOI:10.1039/dt9920003015
日期:——
A simple, direct route from 2,2'-bipyridine to 6,6'-dicyano-2,2'-bipyridine and its conversion to the 6,6'-dithiocarboxamide and various novel tetra- and hexa-dentate ligands such as the 6,6'-bis(4-methyl-thiazol-2-yl) and 6,6'-bis[4-(2-pyridyl)thiazol-2-yl] derivatives have been established. Diaqua[6,6'-bis(4-methylthiazol-2-yl)-2,2'-bipyridine]zinc(II) bis(trifluoromethanesulfonate) has been prepared and its crystal structure determined. The tetra-heterocyclic ligand is planar, binding through two bipyridine nitrogen atoms and, more weakly, through two thiazolyl nitrogen atoms to zinc(ii) which is in a distorted octahedral environment.