☆ 4.6 Article

A Family of Four-Coordinate Iron(II) Complexes Bearing the Sterically Hindered Tris(pyrazolyl)borato Ligand Tp(tBu,Me)

CHEMISTRY-A EUROPEAN JOURNAL (2011)

Journal

CHEMISTRY-A EUROPEAN JOURNAL

Volume 17, Issue 4, Pages 1310-1318

Publisher

WILEY-V C H VERLAG GMBH

DOI: 10.1002/chem.201001792

Keywords

coordination modes; iron; metal complexes; scorpionates; tris(pyrazolyl)borates

Funding

U.S. Department of Energy [DE-FG02-92ER14273]
Howard Hughes Medical Institute Undergraduate Science Education

Ask authors/readers for more resources

Protocol

Community support

Reagent

Community support

Abstract

A new family of 14-electron, four-coordinate iron(II) complexes of the general formula [Tp(tBu,Me)FeX] (Tp(tBu,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 FeX2 with Tp(tBu,Me)K. The related fluoride complex was prepared by reaction of 1 with AgBF4. 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 angstrom.

Authors

I am an author on this paper

Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6

Not enough ratings

Secondary Ratings

Novelty

Significance

Scientific rigor

Rate this paper

Transition Metal Borate Complexes Containing κ0-κ6 Denticity of Scorpionate Borate Ligands

Suvam Saha, Faneesha Assanar, Sundargopal Ghosh

Summary: The recent developments in the field of transition metal borate complexes have had a significant impact on modern coordination chemistry. These complexes exhibit structural diversities that are crucial in numerous catalytic processes. Polypyrazolyl borate ligands, commonly known as scorpionates, have been extensively used in the preparation of transition metal borate complexes. The presence of multiple donor atoms in the flexible borate proligands leads to various coordination modes. The denticity of borate ligands in these complexes ranges from kappa(0) to kappa(6), depending on the electronic and steric properties of the ligands and the metals. The different bonding modes of these borate ligands make them highly interesting in main group organometallic chemistry. Additionally, the cooperative activation of boranes by transition metal complexes containing metal-nitrogen or metal-sulfur bonds has emerged as an alternative synthetic route for transition metal borate complexes. This review summarizes the progress in the chemistry of transition metal borate complexes, focusing on synthetic methods and bonding scenarios.

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY (2023)