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Anionic Poly(pyrazolyl)borate Ligands Obtained from 3,5‐Dimethylpyrazole and 3,5‐Diphenylpyrazole and Their Cobalt(II) Complexes − X‐ray Crystallographic and 1 H NMR Studies
Author(s) -
Ruman Tomasz,
Ciunik Zbigniew,
Mazurek Jaroslaw,
Wolowiec Stanislaw
Publication year - 2002
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200203)2002:3<754::aid-ejic754>3.0.co;2-n
Subject(s) - chemistry , hexacoordinate , cobalt , ligand (biochemistry) , crystallography , boron , stereochemistry , inorganic chemistry , organic chemistry , biochemistry , receptor , silicon
Synthesis of poly(pyrazolyl)borate anionic ligands composed of 3,5‐dimethyl‐ and 3,5‐diphenylpyrazoles and their bis(ligand) high‐spin cobalt(II) complexes are described. The molecular structures of [dihydrobis(3,5‐diphenylpyrazolyl)borato][hydrobis(3,5‐dimethylpyrazolyl)(3,5‐diphenylpyrazolyl)borato]cobalt(II) and bis[dihydro(3,5‐dimethylpyrazolyl)(3,5‐diphenylpyrazolyl)borato]cobalt(II) complexes were established by X‐ray crystallography. The cobalt center is hexacoordinate in the former with five Co−N 2 (pyrazolyl) bonds and short Co−H [attached to the boron atom of bis(pyrazolyl)borate] bond (2.03 Å), whereas a distorted tetrahedral geometry was found for the latter due to four Co−N 2 (pyrazolyl) bonds. Additionally, the pentacoordinate homoscorpionate [tris(3,5‐diphenylpyrazolyl)borato]cobalt(II) nitrate side product was obtained from the reaction and characterized structurally. It contains a κ 3 ‐coordinated Tp′ ligand and a κ 2 ‐bound nitrate anion.