Preparation and characterisation of some dimeric η2-diyne complexes of cobalt

Catherine E. Housecroft, Brian F G Johnson, Muhammad S. Khan, Jack Lewis, Paul R. Raithby, Michael E. Robson, Della A. Wilkinson

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Abstract

The organometallic dimers [{Co2(CO)6}2(diyne)] (diyne = HC2C6H4C2H 1, HC2C6H4C6H4C2H 2, HC2C6H4CH2C6H 4C2H 3, Me3SiC2C6H4C6H 4C2SiMe3 4, Me3SiC2C6H4CH2C 6H4C2SiMe3 5 or Me3SnC2C6H4C6H 4C2SnMe3 6) have been synthesised from the reaction of octacarbonyldicobalt(0), [Co2(CO)8], with the appropriate diyne. The products have been characterised by infrared spectroscopy, electron impact (El) mass spectrometry, microanalysis and 1H NMR spectroscopy. The complexes 1, 3 and 4 have been characterised by single-crystal X-ray crystallography. In all cases both 'yne' fragments of the diyne bond to a Co2(CO)6 fragment with the C≡C vector essentially perpendicular to the Co-Co vector. A bonding analysis by a Fenske-Hall calculation using the crystallographically determined coordinates for dimer 1 is consistent with the observed distortion of the Co2C2 bonding pattern away from quasi-tetrahedral geometry.

Original languageEnglish
Pages (from-to)3171-3178
Number of pages8
JournalJournal of the Chemical Society, Dalton Transactions
Issue number22
DOIs
Publication statusPublished - 1992

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Cobalt
Dimers
X ray crystallography
Organometallics
Nuclear magnetic resonance spectroscopy
Mass spectrometry
Infrared spectroscopy
Single crystals
Geometry
Electrons

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Housecroft, C. E., Johnson, B. F. G., Khan, M. S., Lewis, J., Raithby, P. R., Robson, M. E., & Wilkinson, D. A. (1992). Preparation and characterisation of some dimeric η2-diyne complexes of cobalt. Journal of the Chemical Society, Dalton Transactions, (22), 3171-3178. https://doi.org/10.1039/DT9920003171

Preparation and characterisation of some dimeric η2-diyne complexes of cobalt. / Housecroft, Catherine E.; Johnson, Brian F G; Khan, Muhammad S.; Lewis, Jack; Raithby, Paul R.; Robson, Michael E.; Wilkinson, Della A.

In: Journal of the Chemical Society, Dalton Transactions, No. 22, 1992, p. 3171-3178.

Research output: Contribution to journalArticle

Housecroft, Catherine E. ; Johnson, Brian F G ; Khan, Muhammad S. ; Lewis, Jack ; Raithby, Paul R. ; Robson, Michael E. ; Wilkinson, Della A. / Preparation and characterisation of some dimeric η2-diyne complexes of cobalt. In: Journal of the Chemical Society, Dalton Transactions. 1992 ; No. 22. pp. 3171-3178.
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abstract = "The organometallic dimers [{Co2(CO)6}2(diyne)] (diyne = HC2C6H4C2H 1, HC2C6H4C6H4C2H 2, HC2C6H4CH2C6H 4C2H 3, Me3SiC2C6H4C6H 4C2SiMe3 4, Me3SiC2C6H4CH2C 6H4C2SiMe3 5 or Me3SnC2C6H4C6H 4C2SnMe3 6) have been synthesised from the reaction of octacarbonyldicobalt(0), [Co2(CO)8], with the appropriate diyne. The products have been characterised by infrared spectroscopy, electron impact (El) mass spectrometry, microanalysis and 1H NMR spectroscopy. The complexes 1, 3 and 4 have been characterised by single-crystal X-ray crystallography. In all cases both 'yne' fragments of the diyne bond to a Co2(CO)6 fragment with the C≡C vector essentially perpendicular to the Co-Co vector. A bonding analysis by a Fenske-Hall calculation using the crystallographically determined coordinates for dimer 1 is consistent with the observed distortion of the Co2C2 bonding pattern away from quasi-tetrahedral geometry.",
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