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A Family of Four‐Coordinate Iron(II) Complexes Bearing the Sterically Hindered Tris(pyrazolyl)borato Ligand Tp t Bu,Me
Author(s) -
Jové Fernando A.,
Pariya Chandi,
Scoblete Michael,
Yap Glenn P. A.,
Theopold Klaus H.
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201001792
Subject(s) - steric effects , ligand (biochemistry) , chemistry , crystallography , halide , metathesis , tris , salt metathesis reaction , crystal structure , stereochemistry , medicinal chemistry , inorganic chemistry , polymerization , organic chemistry , biochemistry , receptor , polymer
A new family of 14‐electron, four‐coordinate iron(II) complexes of the general formula [Tp t Bu,Me FeX] (Tp t Bu,Me is the sterically hindered hydrotris(3‐ tert ‐butyl‐5‐methyl‐pyrazolyl) borate ligand and X=Cl ( 1 ), Br, I) were synthesized by salt metathesis of FeX 2 with Tp t Bu,Me K. The related fluoride complex was prepared by reaction of 1 with AgBF 4 . Chloride 1 proved to be a good precursor for ligand substitution reactions, generating a series of four‐coordinate iron(II) complexes with carbon, oxygen, and sulphur ligands. All of these complexes were fully characterized by conventional spectroscopic methods and most were characterized by single‐crystal X‐ray crystallographic analysis. Magnetic measurements for all complexes agreed with a high‐spin (d 6 , S =2) electronic configuration. The halide series enabled the estimation of the covalent radius of iron in these complexes as 1.24 Å.