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Complexes of heteroscorpionate trispyrazolylborate anionic ligands. Part V. X-ray crystallographic studies of cobalt(II) complexes with hydrobis(3,5-dimethylpyrazolyl)(3,5-diphenylpyrazolyl)borate and hydrobis(3,5-diphenylpyrazolyl)(3,5-dimethylpyrazolyl)borate ligands.

Autorzy

Tomasz Ruman

Zbigniew Ciunik

A. Goclan

Marta Łukasiewicz

Stanisław Wołowiec

Rok wydania

2001

Czasopismo

Polyhedron

Numer woluminu

20

Strony

2965-2970

DOI

10.1016/S0277-5387(01)00911-1

Kolekcja

Naukowa

Język

Angielski

Typ publikacji

Artykuł

Streszczenie

Synthesis of poly(pyrazolyl)borate anionic ligands composed of 3,5-dimethyl- and 3,5-diphenylpyrazoles gave two heteroscorpionate tris(pyrazolyl)borate anionic ligands (Tp′): hydrobis(3,5-dimethylpyrazolyl)(3,5-diphenylpyrazolyl)borate and hydrobis(3,5-diphenylpyrazolyl)(3,5-dimethylpyrazolyl)borate, which were converted into high-spin cobalt(II) complexes. The molecular structure of hexacoordinate tetrahydrofuran hydrobis(3,5-dimethylpyrazolyl)(3,5-diphenylpyrazolyl)boratocobalt(II) nitrate and [dihydrobis(3,5-diphenylpyrazolyl)borato][hydrobis(3,5-diphenylpyrazolyl) (3,5-dimethylpyrazolyl)borato]cobalt(II) complexes were established by X-ray crystallography. The Tp′ ligands are κ3 bound to the central metal ion in both complexes. The coordination sphere is completed with three oxygen donors from the nitrate anion and tetrahydrofuran in the former compound and two nitrogen donors and a boron-attached hydrogen from the dihydrobis(3,5-diphenylpyrazolyl)borate ligand with a 2.035 Å CoH bond in the latter complex. Heteroscorpionate anionic hydrobis(3,5-dimethylpyrazolyl)(3,5-diphenylpyrazolyl)borate and hydrobis(3,5-diphenylpyrazolyl)(3,5-dimethylpyrazolyl)borate Tp′ ligands form high-spin cobalt(II) complexes of the general formula Tp′CoX (X=NO3 − and [H2B(3,5-diPhpz)2]−). Two of the heteroscorpionate complexes containing hexacoordinate cobalt(II) centers were characterized crystallographically: [HB(3,5-diMepz)2(3,5-diPhpz)]Co(NO3)(THF) and [HB(3,5-diPhpz)2(3,5-diMepz)][H2B(3,5-diPhpz)2]Co. A short BH⋯Co agostic contact of 2.035 Å has been found in the latter complex.

Słowa kluczowe

Poly(3-Rpyrazolyl)borate cobalt(II) complexes, Structures, NMR

Adres publiczny

https://doi.org/10.1016/S0277-5387(01)00911-1

Strona internetowa wydawcy

http://www.elsevier.com

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