Add time:08/13/2019         Source:sciencedirect.com

The IR spectra of N-tert-butoxycarbonyl-amino acids and of the complex between N-tert-butoxycarbonyl-L-phenylalanine and pyridine are investigated at temperatures ranging from 25 to −180°C. A decrease of the temperature results in a contraction of the NH⋯O or OH⋯O hydrogen bonds. In this temperature range, linear correlations between the ν(NH) and ν(OH) stretching vibrations and the temperature are established. The slope of these correlations decreases with the R(O⋯O) or R(N⋯O) distances previously determined by X-ray diffraction.

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