546087-23-4Relevant academic research and scientific papers
Alkynylcarbyne(bipyridine)dicarbonyl(triflouroacetato) complexes - Synthesis and detection of reversible association in solution
Schwenzer, Birgit,Fischer, Helmut
, p. 16 - 23 (2007/10/03)
A series of alkynylcarbyne(bipyridine)(dicarbonyl)trifluoroacetato complexes, [CF3COO(L-L)(CO)2M≡C-C≡C-R] (M = W, Mo; L-L = 2,2′-bipyridine, 4,4′-dimethyl 2,2′-bipyridine; R = SiMe3, Ph, p-Tol, t-Bu), has been prepared by sequential reaction of [M(CO)6] with Li[C≡CR], trifluoroacetic anhydride, and L - L. All complexes were fully characterized. Concentrated solutions of these complexes exhibit two sets of ν(CO) absorptions (instead of the expected one set (A1/B1). The ratio A1/B1:A1*/B1* is concentration-dependent and decreases with increasing concentration of the complexes in solution. This phenomenon is discussed on the basis of a reversible association of complex molecules to form dimers and oligomers prior to precipitation and crystallization.
