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Xia, C.-G., Bott, S.G., Wu, G. and Richmond, M.G. (2004) Reaction of the Dicobalt Alkyne Compound Co2(CO)6 (μ-dmad) with the Dipjosphine Ligand 4,5-Bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd). Spectroscopic Properties, X-Ray Diffraction Data, and Thermal Reactivity of the Chelating Isomer of Co2(CO)4 (bpcd) (μ-dmad). Journal of Chemical Crystallography, 34, 513-521.
http://dx.doi.org/10.1023/B:JOCC.0000042019.54785.9a

has been cited by the following article:

• TITLE: Molecular Structure of Co2(μ-Alkyne) Complex Containing Ph2PC5F6PPh2 Ligand

  AUTHORS: Makoto Minato, Yasutada Miyato, Masaki Kakeya

  KEYWORDS: Alkyne-Bridged Cobalt Complex, Electron Deficient Ligand, Crystal Structure, Coordinated Alkyne C≡C Bond

  JOURNAL NAME: International Journal of Organic Chemistry, Vol.5 No.2, June 30, 2015

  ABSTRACT: Oxidative-decarbonylation of Co2(CO) 6(μ-PhC≡CH) with Me3NO in the presence of an electron deficient ligand, Ph2PC5F6PPh2 (F6FOS), produces Co2 (CO) 4 (μ-PhC≡CH)(F6FOS), (1). The metrical values of 1 have been compared to those of the closely related cobalt carbonyl alkyne compound A containing (Z)-Ph2PCH=CHPPh2 (Z-dppe) ligand. Strikingly anomalous is an alkyne C≡C bond (1.34(1) Å in 1, which is somewhat elongated compared to A (1.31(1) Å). When taking a strong electron-withdrawing power of fluoride atom into account, F6FOS ligand appeared to reduce the π-back-donation ability of cobalt atom, making this bond shortened in comparison to the same bond in A. Bond lengthening in the alkyne C≡C bond in 1 is attributed to the enhanced electron donor ability of F6FOS compared to Z-dppe and can be understood by examining resonance structures of F6FOS ligand.