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1 Polish Journal of Chemistry

1 2009

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Blue and Red Frequency Shift Effects Related with XA–H...B-Y Complex Formation

Rutkowski K. S., Karpfen A., Melikova S. M., Rodziewicz P.

Polish Journal of Chemistry

2009

Vol. 83, nr 5

965-980

Results of FTIR spectroscopic measurements in cryosolutions and ab initio calculations performed for a set of complexes stabilized by conventional and “im proper” H-bonds have been presented and analyzed. The main attention is paid to the blue and red frequency shift effects on the stretching vibrations which were ob served/or predicted for complexes of a weak to medium strength, formed between so called CH acids and various electron donor counter parts. It has been shown that the features of the dipole moment function and the type of intramolecular coupling between the vicinal bonds of the inter acting counter parts predefine in the most extent the sign of the frequency shift of respective stretching vibrations.