Local and solvation pressures in aqueous solutions of ethylenediamine probed by Raman spectroscopy

Cáceres Alonso, María Mercedes; Lobato Fernández, Álvaro; Nubia Judith Mendoza; Laura Jimenez Bonales; García Baonza, Valentín

Local and solvation pressures in aqueous solutions of ethylenediamine probed by Raman spectroscopy

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Official URL

https://doi.org/10.1039/C6CP03857C

Publication date

2016

Authors

Cáceres Alonso, María Mercedes

Lobato Fernández, Álvaro

Nubia Judith Mendoza

Laura Jimenez Bonales

García Baonza, Valentín

Publisher

Royal Society of Chemistry

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URI

https://hdl.handle.net/20.500.14352/92321

Citation

Cáceres, M.; Lobato, A.; Mendoza, N. J.; Bonales, L. J.; Baonza, V. G. Local, solvation pressures and conformational changes in ethylenediamine aqueous solutions probed using Raman spectroscopy. Phys. Chem. Chem. Phys. 2016, 18, 26192-26198 DOI:10.1039/C6CP03857C.

Abstract

Raman spectra of 1,2-ethylenediamine (EDA) in aqueous solutions are used to demonstrate that EDA molecules experience an anti–gauche conformational change resulting from the interactions with water. The observed Raman shift reveals a compressive (hydrophobic) effect of water on both methylene and amino groups of EDA. Raman spectra of EDA at high pressures are used as reference to quantify the intermolecular EDA–H2O interactions in terms of local pressures. These results are compared with macroscopic solvation pressures calculated from the cohesive energy parameter. We compare and discuss all our observations with available computational and experimental studies.