Spectral study of specific interactions between zwitterionic compounds and protic solvents.
The zwitterionic compounds, like ylids, can interact both by universal and specific forces with the protic solvents. Ylids have a visible electronic absorption band with intramolecular charge transfer (ICT), very sensitive to the solvent nature and considered as an indicator of their stability. Two zwitterionic compounds: pyridinium dicarbethoxy methylid and iso-quinolinium dicarbethoxy methylid were studied from solvatochromic point of view and the contribution of solute-solvent specific interactions to the total spectral shift of the visible ICT band was established. Ternary solutions of the studied ylids were used to estimate the difference of interaction energies in molecular pairs ylid-protic solvent and ylid-aprotic solvent in the limits of the cell model of three component solutions.
Alexandru Ioan Cuza University, Faculty of Physics, Carol I Bvd., RO 700506, Iasi, Romania.
Daniela
D
Babusca
Alexandru Ioan Cuza University, Faculty of Physics, Carol I Bvd., RO 700506, Iasi, Romania.
Cezarina
C
Morosanu
Alexandru Ioan Cuza University, Faculty of Physics, Carol I Bvd., RO 700506, Iasi, Romania. Electronic address: ddorohoi@uaic.ro.
Dana Ortansa
DO
Dorohoi
Iso-quinolinium dicarbethoxy methylid; Protic and aprotic solvents; Pyridinium dicarbethoxy methylid; Specific interactions; Visible electronic absorption spectra