About intermolecular interactions in binary and ternary solutions of some azo-benzene derivatives

Excited State Molecular Parameters Determined by Spectral Means

“…Two azo-derivatives were prepared, as is indicated in [15][16][17], and previously solvatochromically analyzed from the point of view of the excited state parameters [17] in the frame of the hypothesis that their dipole moments in the ground and excited states are collinear.…”

“…The electronic absorption spectra were recorded at a Specord UV Vis Carl Zeiss Jena spectrophotometer with data acquisition system. The spectral data published in [16,17] were verified and used in this paper. The solvents parameters and the results of solvatochromic analysis are given in [16,17].…”

“…The spectral data published in [16,17] were verified and used in this paper. The solvents parameters and the results of solvatochromic analysis are given in [16,17]. The Kamlet-Taft solvent parameters were taken from http:// www.stenutz.eu/chem/solv26.php.…”

“…The nature of the interactions between the azobenzenes and the solvents (and so the spectral behavior in solutions) is determined by their donor or acceptor substituents in para positions of the aromatic groups [15][16][17]. The results obtained by quantum mechanical calculations and by solvatochromic studies were previously [17] correlated, and the dipole moments of three azo-benzene derivatives were estimated using the hypothesis of colinearity between molecular dipole moments of the electronic states participating to the → * transition responsible for the azo-benzenes' visible band appearance. This study offers an additional information regarding the excited state dipole moment and its orientation relative to the ground state dipole moment.…”

Effect of various solvents on the absorption spectra of dithizone and DFT calculations

“…In a binary mixture, one component of the mixture preferentially interacts with the solute molecule in its vicinity to form additional intermolecular interactions such as hydrogen bonding or dipole-dipole interactions [13,14]. The solute-solvent interactions can be modified by changing the mixture composition in order to understand the role of these interactions in the solvation process [15]. In this paper, dithizone absorption spectra in various solvents and their binary mixtures were investigated and the results were interpreted in term of solvent-solute interactions.…”