Ligand 77 Nitrogen oxides

Synthetic and structural chemistry of heme derivatives with nitrogen oxide ligands 99ACR350. 

We have hypothesized that the second electrochemical process formally refers to NO° reduction. It seems to be more convenient to attribute the second reduction process in the CV of ds/tra 5-[Ru(bpy)2L(NO)] complexes as delocalized charge, which should be more representative for a system with different contributions from an L spectator Hgand and a nitrogen oxide ligand. 

Organometallic compounds apart, oxidation states below - -2 are best represented by complexes with tris-bidentate nitrogen-donor ligands such as 2,2 -bipyridyl. Reduction by LiAlH4 in thf yields tris(bipyridyl) complexes in which the formal oxidation state of vanadium is -1-2 to —1. Magnetic moments are compatible with low-spin configurations of the metal but. 

The presence of zinc with bidentate nitrogen donor ligands in the formation of novel composite materials by hydrothermal reactions has been studied. A zinc-containing one-dimensional material, [Zn(phenanthroline)Mo04] was isolated from molybdate, and from vanadium oxide in the presence of zinc 2,2 -bipyridine [Zn(2,2,-bipyridine)2V40i2] was obtained.212,213... 

Formally, in each of these cases the disproportionation produces a positive metal ion and a metal ion in a negative oxidation state. The carbonyl ligands will be bound to the softer metal species, the anion the nitrogen donor ligands (hard Lewis bases) will be bound to the harder metal species, the cation. These disproportionation reactions are quite useful in the preparation of a variety of carbonylate complexes. For example, the [Ni2(CO)6]2 ion can be prepared by the reaction... 

Since the early 1980s rich thermal and photochemical redox chemistries of Os =N species containing nonlabile oxidation-resistant nitrogen donor ligands have emerged. However, there are only a few examples of ruthenium(VI) nitrido complexes of this type, and their redox chemistry is largely unexplored. 

Extensive work on cis- and trans-d o o complexes of ruthenium(VI) and osmium(VI) containing nonlabile, oxidation-resistant nitrogen donor ligands has been reported. 

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