Abstract
The surrounding medium may play an important role in the activity of biological macromolecules. The action of salts, among others, may modify the macromolecular conformation, such as for gelatin, lithium bromide induced mutarotation of polyproline (Ramachandran, 1967; Von Hippel, 1969), or conformational changes of polyglycine (Baron, 1973). The ion transfer through membranes takes place through antibiotic-salts interactions (Mumoz et al., 1972; Ovchinnikov and Ivanov, 1975). These biological molecules may be either polypeptide chains, as in proteins, or chains with alternate ester and peptide groups, as in depsipeptides, or cyclic ethers and methyl esters. We therefore thought it of interest to start an investigation, through infrared and Raman spectroscopy, of the interactions between some esters and amide molecules and alkaline Earths or alkaline salts. Infrared and Raman spectroscopy are well adapted for studying short life interactions, and Raman laser spectroscopy makes it possible to examine aqueous solutions. On certain points the present work cross-checks the results obtained from quantum chemistry calculations (Pullman, 1974; Perricaudet, 1973). We shall first show how the organization of carbonyl groups around the cations may be determined through infrared and Raman spectroscopy. We shall then discuss the nature of interactions between cations and these molecules.
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Baron, M.H., Jaeschke, H., Moravie, R.M., De Lozé, C., Corset, J. (1977). Infrared and Raman Studies of Interactions between Salts and Amides or Esters. In: Pullman, B., Goldblum, N. (eds) Metal-Ligand Interactions in Organic Chemistry and Biochemistry. The Jerusalem Symposia on Quantum Chemistry and Biochemistry, vol 9-1. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-1170-9_12
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DOI: https://doi.org/10.1007/978-94-010-1170-9_12
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