Wydział Chemii

Joanna Kisała

Agata Białońska

Zbigniew Ciunik

S. Kurek

Stanisław Wołowiec

2006

Polyhedron

25

3222-3230

10.1016/j.poly.2006.05.028

Naukowa

Angielski

Artykuł

The molybdenum complexes of hydrotrispyrazolylborate ligands were studied. Hydrotris(5-methyl-3-(2-thienyl)pyrazol-1-yl)borate (Tp^Th,Me) was coordinated in η³ mode to molybdenum in [Et₄N][Tp^Th,MeMo(CO)₃] and Tp^Th,MeMo(CO)₃(η³-allyl) complexes in solid state as was determined crystallographically. The heteroscorpionate hydrobis(5-methyl-3-phenylpyrazol-1-yl)(3-methyl-5-phenylpyrazol-1-yl)borate (Tp″) complexes: [Et₄N][Tp″Mo(CO)₃] and Tp″Mo(CO)₃(η³-allyl) were synthesized and their dynamic behavior and reactivity was studied and compared with standard [Et₄N][T^∗Mo(CO)₃] and Tp^∗Mo(CO)₃(η³-allyl) pair. All studied tricarbonyl complexes are reversibly oxidized at very low potentials, whereas the allyl compounds require much higher potentials for a generally irreversible oxidation to proceed. The oxidation products of Mo(0) and Mo(II) complexes with iodine and/or TBHP were characterized spectroscopically. The product of oxidation of Tp^∗Mo(CO)₃I with oxygen was tetranuclear linear molybdenum(V) complex with terminal metal ions coordinated to Tp^∗ ligands and inner molybdenum(V) ions surrounded exclusively by oxygen donors.

Polypyrazolylborate, Molybdenum, Structure, NMR

https://doi.org/10.1016/j.poly.2006.05.028

http://www.elsevier.com