Dialkylchromium complexes bearing a hydrotris(3,5-dimethylpyrazolyl)borate ligand

Synthesis and crystal structures of Tp*CrMe2(DMAP) and Tp*Cr(Cr(CH2Ph)2(DMAP) (DMAP=4-dimethylaminopyridine)

Kazushi Mashima, Toshiyuki Oshiki, Kazuhide Tani, Takayuki Aoshima, Hisao Urata

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The synthesis and the crystallographic characterization of two dialkylchromium complexes possessing a Tp* ligand, i.e. Tp*CrMe2(DMAP) (4) and Tp*Cr(CH2Ph)2(DMAP) (5) (Tp*=hydrotris(3,5-dimethylpyrazolyl)borate; DMAP=4-dimethylaminopyridine), are described. Treatment of Tp*CrCl2(DMAP) (3) with two equivalents of MeLi gave 4, while the complex 5 was prepared by the reaction of 3 with two equivalents of PhCH2MgCl. These complexes were found to be thermally robust and quite stable to air and moisture. Distorted octahedral geometry around each chromium center of 4 and 5 has been determined by X-ray analysis, the chromium center being surrounded with three nitrogen atoms of the Tp* ligand at facial positions, one nitrogen atom of the DMAP ligand, and two carbon atoms. The two benzyl ligands of 5 were found to coordinate to the chromium center in η1-fashion.

Original languageEnglish
Pages (from-to)15-19
Number of pages5
JournalJournal of Organometallic Chemistry
Volume569
Issue number1-2
Publication statusPublished - Oct 30 1998
Externally publishedYes

Fingerprint

Bearings (structural)
Borates
borates
Chromium
Crystal structure
Ligands
chromium
ligands
crystal structure
synthesis
Atoms
nitrogen atoms
Nitrogen
X ray analysis
moisture
Moisture
Carbon
Air
X-Rays
Geometry

Keywords

  • Benzyl complex
  • Chromium
  • Crystal structure
  • Hydrotris(3,5-dimethylpyrazolyl)borate
  • Methyl complex

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry
  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Dialkylchromium complexes bearing a hydrotris(3,5-dimethylpyrazolyl)borate ligand : Synthesis and crystal structures of Tp*CrMe2(DMAP) and Tp*Cr(Cr(CH2Ph)2(DMAP) (DMAP=4-dimethylaminopyridine). / Mashima, Kazushi; Oshiki, Toshiyuki; Tani, Kazuhide; Aoshima, Takayuki; Urata, Hisao.

In: Journal of Organometallic Chemistry, Vol. 569, No. 1-2, 30.10.1998, p. 15-19.

Research output: Contribution to journalArticle

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abstract = "The synthesis and the crystallographic characterization of two dialkylchromium complexes possessing a Tp* ligand, i.e. Tp*CrMe2(DMAP) (4) and Tp*Cr(CH2Ph)2(DMAP) (5) (Tp*=hydrotris(3,5-dimethylpyrazolyl)borate; DMAP=4-dimethylaminopyridine), are described. Treatment of Tp*CrCl2(DMAP) (3) with two equivalents of MeLi gave 4, while the complex 5 was prepared by the reaction of 3 with two equivalents of PhCH2MgCl. These complexes were found to be thermally robust and quite stable to air and moisture. Distorted octahedral geometry around each chromium center of 4 and 5 has been determined by X-ray analysis, the chromium center being surrounded with three nitrogen atoms of the Tp* ligand at facial positions, one nitrogen atom of the DMAP ligand, and two carbon atoms. The two benzyl ligands of 5 were found to coordinate to the chromium center in η1-fashion.",
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AB - The synthesis and the crystallographic characterization of two dialkylchromium complexes possessing a Tp* ligand, i.e. Tp*CrMe2(DMAP) (4) and Tp*Cr(CH2Ph)2(DMAP) (5) (Tp*=hydrotris(3,5-dimethylpyrazolyl)borate; DMAP=4-dimethylaminopyridine), are described. Treatment of Tp*CrCl2(DMAP) (3) with two equivalents of MeLi gave 4, while the complex 5 was prepared by the reaction of 3 with two equivalents of PhCH2MgCl. These complexes were found to be thermally robust and quite stable to air and moisture. Distorted octahedral geometry around each chromium center of 4 and 5 has been determined by X-ray analysis, the chromium center being surrounded with three nitrogen atoms of the Tp* ligand at facial positions, one nitrogen atom of the DMAP ligand, and two carbon atoms. The two benzyl ligands of 5 were found to coordinate to the chromium center in η1-fashion.

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