Synthesis, electrochemistry and structural characterization of new dimeric cobalt η2-alkyne carbonyl complexes

Wai Yeung Wong, Hoi Yan Lam, Siu Ming Lee

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33 Citations (Scopus)

Abstract

New dimeric η2-diyne complexes of cobalt [{Co2(CO)6}2(diyne)] (diyne=Me3SiC2(C13H8)C2SiMe3(1), Me3SiC2(C13H6O)C2SiMe3(2), Me3SiC2(C4H2S)2C2SiMe3(3), Me3SiC2(C14H7Fc)C2SiMe3(Fc=ferrocenyl) (4), HC2(C13H8)C2H (5), HC2(C13H6O)C2H (6), HC2(C4H2S)2C2H (7) and HC2(C14H7Fc)C2H (8)) have been prepared in good yields from the reaction of [Co2(CO)8] with half an equivalent of the appropriate diyne ligands Me3SiCCRCCSiMe3and HCCRCCH, respectively (R=2,7-fluorenediyl, 2,7-fluoren-9-onediyl, 2,2′-bithiophene-5,5′-diyl, 9-ferrocenylmethylenefluorene-2,7-diyl). All the compounds 1-8 have been characterized by IR and1H-NMR spectroscopies and mass spectrometry. The redox chemistry of these cobalt-alkyne molecules has been studied by cyclic voltammetry. The molecular structures of 2, 5, 6, 7 and 8 have been determined by single-crystal X-ray diffraction methods. Structurally, each of these displays two 'Co2C2' cores adopting the usual pseudo-tetrahedral geometry with the alkyne bond lying essentially perpendicular to the Co-Co vector. The original linearity of the diyne ligand is lost.
Original languageEnglish
Pages (from-to)70-80
Number of pages11
JournalJournal of Organometallic Chemistry
Volume595
Issue number1
DOIs
Publication statusPublished - 31 Jan 2000
Externally publishedYes

Keywords

  • Alkyne
  • Cobalt
  • Crystal structures
  • Ferrocenyl
  • Fluorene

ASJC Scopus subject areas

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

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