![]() ![]() The fusion of 2,3-bis(2-hydroxy-benzamido)-2,3-butane with (NH 4) 2OsCl 6 (T > 300☌) resulted in the formation of an osmium(IV)-imidazoline complex.Īlso examined was the organometallic chemistry of osmium tetraoxide. This structure has provided a benchmark for comparison with complexed chelates few significant differences were observed. The ligand, (H) 4 CHBA-Et, was found to cocrystallize with pyridinium chloride. The bond distances and angles for this molecule are very similar to those of its precursor, trans-Os(CHBA-Et)(py) 2. Oxidation of trans-Os( CHBA-Et)(py) 2 subsequently resulted in crystals of a new con1plex with a hydroxy and a methoxy group on the ethylene unit bridging the amide nitrogen atoms of the chelated ligand. One such complex, a µ-oxo dimer, was found with potassium ions in unusually low coordination environments (i.e., four- and five-coordinate). These structures exhibited the first examples of bonds between osmium(IV) and an N-coordinated organic amide ligand and a phenoxide ligand. In addition to the dimeric chromium(III) complex, in which the ligand bridges two metal centers, many osmium(IV) complexes were found with the bis-hydroxybenzamido ligands coordinated to one metal center as a planar tetradentate tetraanion. X-ray crystallographic studies have complemented investigations into the coordination chemistry of these bis-hydroxybenzamido ligands with several transition metals. Iron(III) species, synthesized from these ligands and FeCl 3, appear to be analogous to the latter chromium(III) compounds. Similar complexes, with different bis-hydroxybenzamido ligands, have been examined. This is the first well-characterized example of N-coordination to chromium(III).Ī second complex, which is a precursor to the neutral dimer, has not been fully characterized. ![]() The N-bound amide was shown to be a better σ-donor. This is the first molecule in which both forms of monodentate organic amide coordination (i.e., O-bound and N-bound coordination) have been found. A neutral dimeric complex, in which two chelates bridge two metal centers, was discovered and characterized by X-ray crystallography. Two types of complexes were obtained on reacting CrCl 3 The coordination chemistry of chromium, iron, and osmium with bis-hydroxybenzamido chelating ligands was investigated. ![]()
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