Hydrogen bonding (H-bonding) is a specific type of intermolecular interactionbeing formed for favorable mutual orientations of the interacting molecules. One of the authors had developed a model concept relating the H-bonding energy with the change of stretching vibrations OH OH-NC Δν = ν − ν of the alcohol OH-group in acetonitrile and acetone solutions: 0 H 89.24 Δ = Δν ν / . The calculated H-bond energy was 10.45 kJ/mole for acetonitrile and ΔH = 12.12 kJ/mole for acetone. The results obtained are compared with the data calculated using the equilibrium constant of H-bonding reaction; they can also be used to calculate all other thermodynamic H-bond parameters by measuring the equilibrium constant K с in a certain temperature interval. The equilibrium constant is calculated from the Lambert-Bouguer-Beer law:

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Isoquinoline derivatives R 0420Synthesis of 2-Aryl-5,5-dimethyl-5,6-dihydro-1,2,4-triazolo[3,4-a]isoquinolinium Tetrafluoroborates. -(GLUSHKOV*, V. A.; VEDERNIKOVA, E. V.; KOTELEV, M. S.; BAIGACHEVA, E. V.; Russ.