81141-80-2Relevant academic research and scientific papers
Heterobinuclear complexes of heavy metals with 1,3,5-triketonates and their diamine schiff-base derivatives. Synthetic strategies based on positional and geometric isomerism of mononuclear palladium (II) and UO22+ complexes
Lintvedt,Ahmad
, p. 2356 - 2359 (2008/10/08)
Several new mononuclear complexes of Pd(II) and UO22+ have been prepared with the binucleating ligands 1,3,5-triketones and their Schiff-base diamine derivatives. The mononuclear complexes have been used as precursors in the preparation of heterobinuclear complexes by means of two different strategies. One depends upon the site selectivity, i.e., positional isomerism, observed for certain metal ions in the Schiff-base ligands that contain two distinctly different coordination sites. The other, which can be applied to symmetric 1,3,5-triketones, depends upon geometric isomerism. In this case, the UO22+ ion binds two triketonates in a cis-type configuration due to the steric constraints of a fifth equatorial ligand. The cis complex may then be used to bind a second metal ion. Under similar conditions Pd(II) forms a trans-type complex in which it is not possible to add a second metal ion. This work describes the use of preferred isomerism to design specific heterobinuclear complexes containing heavy metal ions.
