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Complexes of heteroscorpionate trispyrazolylborate ligands. Part XII. Variable hapticity of hydrobis (3-phenyl-5-isopropylpyrazolyl)(3,5-dimethylpyrazolyl) borate in its rhodium(I) complexes with COD and NBD.
Autorzy
Rok wydania
2004
Czasopismo
Numer woluminu
23
Strony
219-223
DOI
10.1016/j.poly.2003.11.010
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The structure of Tp″Rh(NBD) complex was determined by X-ray crystallography (Tp″=hydrobis(3-phenyl-5-isopropylpyrazolyl)(3,5-dimethylpyrazolyl)borate, NBD=2,5-norbornadiene). The Tp″ was found to be κ3 coordinated to rhodium(I). Two independent molecules of Tp″Rh(NBD) were found in triclinic crystals with Rh–N(pz) distances in the region of 2.113(3)–2.307(3) Å. On the other hand the same Tp″ ligand was demonstrated to be coordinated in κ2 fashion in Tp″Rh(COD) (COD=1,5-cyclooctadiene) by variable temperature 1-D and 2-D 1H NMR measurements. The intramolecular exchange between coordinated and uncoordinated 3-phenyl-5-isopropylpyrazolyl residues occurs with ΔG≠=42.2 kJ/mol as it was calculated from the 1H NMR studies.Hydrobis(3-phenyl,5-isopropylpyrazolyl)(3,5-dimethylpyrazolyl)borate(Tp″) coordinate in κ3 fashion in Tp″Rh(NBD) complexes, which was characterized crystallographically, while the mode of coordination of Tp″ is κ3 in Tp″Rh(COD) aanalogue, as studied by variable-temperature 1H NMR spectroscopy.
Słowa kluczowe
Polypyrazolylborate, Rhodium(I), Cyclooctadiene, Norbornadiene, Structure, NMR
Adres publiczny
https://doi.org/10.1016/j.poly.2003.11.010
Strona internetowa wydawcy
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