Premium
Oxorhenium(V)‐ and Tricarbonylrhenium(I) Complexes with Substituted Pyrazoles as Products of the Degradation of Hydrotrispyrazolylborates
Author(s) -
Kückmann Theresa I.,
Abram Ulrich
Publication year - 2004
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200400037
Subject(s) - rhenium , pyrazole , denticity , chemistry , dimer , boron , medicinal chemistry , stereochemistry , crystal structure , crystallography , inorganic chemistry , organic chemistry
Hydrotris(3, 5‐dimethylpyrazol‐1‐yl)borate and hydrotris(3‐phenylpyrazol‐1‐yl)borate decompose during reactions with [ReOCl 3 (PPh 3 ) 2 ] and [NEt 4 ] 2 [Re(CO) 3 Br 3 ], respectively. The generated pyrazole ligands form complexes with the rhenium(V) oxo and the rhenium( I ) tricarbonyl cores. X‐ray crystal structures of the oxo‐bridged dimer [Cl(PPh 3 )(O)Re(μ‐O)(μ‐Me 2 pz) 2 Re(O)(HMe 2 pz)Cl] ( 1 ) and [Re(CO) 3 (HPhpz) 2 (Phpz)] ( 2 ) (HMe 2 pz = 3, 5‐dimethylpyrazole, HPhpz = 3‐phenylpyrazole) show that the substituted pyrazoles can readily deprotonate and act as monodentate or bridging anionic ligands. Re‐N bond lengths between 2.09 and 2.14Å have been observed for the bridging and between 2.12 and 2.23Å for the terminal pyrazole ligands.