Structures, physicochemical properties, and reactivities of cobalt(II) complexes supported by a homoscorpionate (Tris(pyrazolyl)borate) ligand Tp Ph,Me

Atsushi Kunishita, Thomas L. Gianetti, John Arnold

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The coordination chemistry of a mononuclear cobalt complex supported by the monoanionic hydrotris-(pyrazolyl)borate tridentate ligand [Tp Ph,Me] containing substituted phenyl groups at the 3-position of the pyrazole rings and methyl groups at the 5-position of the pyrazole rings is examined. The Co(II) halide complex [Tp Ph,Me]CoCl (1) serves as a precursor to the organometallic species [Tp Ph,Me]CoMe (2), [Tp Ph,Me] CoCH 2SiMe 3 (3), [Tp Ph,Me]CoCH 2CH(Me) 2 (4), [Tp Ph,Me]Co(CH 2) 2Me (5), [Tp Ph,Me]CoEt (6), [Tp Ph,Me]Co(CH 2) 5Me (7), and [Tp Ph,Me]Co(CH 2) 3Me (8). All of the cobalt(II) organometallic complexes have been characterized by X-ray crystallography, NMR spectroscopy, FT-IR, and elemental analysis. The X-ray crystallographic analyses reveal that complexes 2-6 and 8 have slightly distorted tetrahedral structures. Solution-state magnetic susceptibility measurements of all complexes in C 6D 6 indicate that they all have 3/2 ground states. The reaction of 1 with tBuLi and iPrMgCl in hexane under N 2 results in the production of the i-butyl and n-propyl complexes 4 and 5, respectively, in ∼56% yield. These isomerizations and exchange reactions of the alkyl group proceed via formation of a Co-H species, as determined by trapping experiments.

Original languageEnglish (US)
Pages (from-to)372-380
Number of pages9
JournalOrganometallics
Volume31
Issue number1
DOIs
StatePublished - Jan 9 2012
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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