Spectroscopic studies of bifurcated hydrogen bonds in solution

The opportunity of the formation of molecular complexes with bifurcated hydrogen bonds (H-bonds) in liquid phase is discussed. It was shown that, practically in all previous. studies, the idea of the bifurcation was used only for the explanation of the observed experimental facts. The IR and H-1 NMR spectra of solutions containing 2,6-disubstituted phenol derivatives with strong intramolecular H-bond and various proton accepters were obtained at 85-300 K, The distinct spectral manifestations of weak additional interaction between the bound OH group of proton donor and proton acceptor molecules were found confirming the real existence of the bifurcated H-bonds in the liquid state,(C) 1999 Elsevier Science B.V. All rights reserved.