Abstract
Calculation of the spectra of intermolecular complexes of 3-aminophthalimide is used as an example to show that when hydrogen bonds are present, the resonance integrals for the proton donor and acceptor atoms are different from zero. Theoretical analysis of strained 3-aminophthalimide complexes allowed us to establish the determining role of hydrogen bonds in their formation. Using an intramolecular peptide hydrogen bond as an example, we studied the effect of the solvent on its parameters. In particular, we showed that hydrogen bond formation with a proton-acceptor group of the chelate ring leads to a decrease in the resonance integral, and consequently a decrease in the enthalpy of formation of the intramolecular hydrogen bond, to a significantly greater degree than formation of a hydrogen bond at a proton-donor group.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 73, No. 6, pp. 735–740, November–December, 2006.
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Krivul’ko, K.F., Klishchenko, A.P. Calculation of electronic spectra for intermolecular complexes of 3-aminophthalimide by a modified Hückel molecular orbital method. J Appl Spectrosc 73, 822–828 (2006). https://doi.org/10.1007/s10812-006-0161-6
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DOI: https://doi.org/10.1007/s10812-006-0161-6