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Pyrazolylcyclohexanol Complexes of Vanadium − A Temperature‐ and Solvent‐Dependent Monomer−Dimer Equilibrium
Author(s) -
Glas Holger,
Köhler Klaus,
Herdtweck Eberhardt,
Maas Peter,
Spiegler Michael,
Thiel Werner R.
Publication year - 2001
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(200108)2001:8<2075::aid-ejic2075>3.0.co;2-0
Subject(s) - chemistry , dimer , vanadium , monomer , electron paramagnetic resonance , solvent , denticity , crystallography , cyclohexanol , ligand (biochemistry) , stereochemistry , inorganic chemistry , organic chemistry , crystal structure , catalysis , nuclear magnetic resonance , polymer , biochemistry , physics , receptor
Abstract The reaction of VOCl 3 with tridentate rac ‐ trans ‐[1‐pyrazolyl‐3‐(2‐pyridyl)]cyclohexanol in the presence of K 2 CO 3 generates a mononuclear six‐coordinate V V complex. With the bidentate ligand rac ‐ trans ‐2‐(pyrazol‐1‐yl)cyclohexan‐1‐ol, reduction of V V to V IV takes place to give a dinuclear complex with bridging alkoxo units; this compound is also accessible starting directly from the V IV precursor VOSO 4 and LiCl. Both complexes were characterized spectroscopically and by X‐ray diffraction. The dimeric V IV complex is in equilibrium with its monomeric counterpart; this temperature‐ and solvent‐dependent equilibrium was followed by EPR spectroscopy.