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Yang, K., Bott, S.G. and Richmond, M. (1996) Regioselective Phosphine Attack on the Coordinated Alkyne in Co2 (μ-Alkyne) Complexes Reactivity Studies and X-Ray Diffraction Structures of Co2(CO)4 (bma) (μ-HC≡CtBu) and the Zwitterionichydrocarbyl Complexes Co2(CO)4{η2,η2,η1,η1-(Z)-Ph2PC (Ph)=(Ph)CC=C (PPh2)C(O)OC(O)}. Journal of Organometallic Chemistry, 516, 65-80.
http://dx.doi.org/10.1016/0022-328X(95)06090-J

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.