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Complex formation in the trifluoroacetic acid (TFA)--DMF system containing TFA from 0 to 100 mol.% was studied by IR multiple attenuated total reflectance (MATR) spectroscopy at 30 ~ The formation of uncharged I : I TFA--DMF complexes with a quasi-ion structure and partial proton transfer to the O atom of the DMF molecule (quasi-ion pairs) were observed in the TFA--DMF system with the TFA content from 0 to 90 tool%. Depending on the ratio of the components, the quasi-ion pairs are solvated by the I.)MF or TFA molecules. The solvation of the quasi-ion pairs slightly changes the parameters of the central strong H bond. When the acid concentration reaches 80 tool.%, the proton adds to the DMF molecule to form the ion pair {DMF)H+-(A...H..A) -. whose anion contains a strong s.~mmetric H bond.

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