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Dihydrogen Complexes - Examples
The following two equations demonstrate the two synthetic routes for dihydrogen complexes.
In particular -Metals are used to form --Complexes empowered. On the other hand, the oxidative addition of H2 preferred if a classic dihydrido complex with a -Electronic configuration is formed. Both apparently depend on the particularly high ligand field stabilization energy -Complexes together. So [Cr (η2-H2) (CO)5] (Cr0,) a nonclassical dihydrogen complex and [Fe (H)2(CO)4] (FeII,) a classic dihydrido complex.
The coordination of dihydrogen can result in a large increase in the acidity of H.2 accompanied.
That's how it is Osmium complex with a = -2 a very strong acid. Such reactions correspond to heterolytic bond cleavage of H.2. This is also at H.2-binding hydrogenases detected and possibly play -H2-Complexes also play a role in these.
It's not always easy to get between non-classic -H2-Complexes and classic Differentiate between dihydrido complexes. In general, it is difficult to precisely localize hydrogen atoms in the immediate vicinity of heavy metals in X-ray single crystal structure studies. Neutron diffraction experiments, on the other hand, require very large single crystals. Deliver by NMR spectroscopy - Relaxation measurements and the size of H-D coupling constants in -HD complexes statements about the bond relationships.
Besides the ones discussed here --Complexes ( 0.8-0.9 Å) there are also those with an extended length -Bond (1.1-1.6 Å).Distances> 1.7 Å indicate classical dihydrido complexes. In the complex [ReH7(dtpe)2] (dtpe: 1,2-bis (ditolylphosphano) ethane) two of the seven H ligands are only 1.357 Å apart, so that an H2-Complex with extended -Binding exists. So it should [ReH5(H2) (dtpe)2] to be written.