Ligands diketonate, displacement

A number of complexes of neutral -diketones are known, although such complexes are generally not very stable. They can be synthesized by addition of the /3-diketone to a simple metal salt or coordinatively unsaturated metal complex, by controlled hydrolysis of a metal /3-diketonate, or by displacement of a weakly bound neutral ligand by the /3-diketone. 

Figure 2.31 Molecular structure of Eu(F )3 (dmphen)(EtOH)dmphen. (Displacement ellipsoids for non-FI atoms are shown at the 50% probability level and H atoms are represented by circles of arbitrary size) [26b]. (Reprinted from Inorganica Chimica Acta, 360, C.R. De Silva, J.R. Maeyer, R. Wang, GS. Nichol, Z. Zheng, Adducts of europium -diketonates with nitrogen p,p -disubstituted bipyridine and phenanthroline ligands Synthesis, structural characterization, and luminescence studies, 3543-3552, 2007, with permission from Elsevier.)...

GC data were reported for a series of S-diketonates bearing aryl groups. Although the chelates are thermally stable and volatile at typical column temperatures, several adverse phenomena, including peak asymmetry, baseline elevation, displacement and primary effects, were observed . Column components and the extent of fluorination in the chelate were established as contributing factors to the adverse behavior. The Cr(III), Al(in), Fe(ni), V(ni), Cu(II) and chelates of nonfluorinated ligands fail to elute... 

---