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A theoretical study of the interaction between N–nitrosodiethanolamine (NDELA) molecule and one to five molecules of water has been performed at the B3LYP level using a large polarized basis set. The calculated complexation energies (corrected for BSSE and ZPVE)
of NDELA with one, two, three, four and five molecules of water are –4.62, –9.83, –15.29, –21.60, and –25.10 kcal/mol respectively at the B3LYP/6–311++G** level. In all complexes studied there are red shifts in the vibrational frequencies of the O–Hs of NDELA and water molecules along with increases in the corresponding IR intensities.