title: About intermolecular interactions in binary and ternary solutions of some azo-benzene derivatives.
abstract: The nature and strength of the intermolecular interactions in the solutions of three azo-benzene derivatives (ADi, i=1, 2, 3) were established by solvatochromic effects in solvents with different electric permittivities, refractive indices and Kamlet-Taft constants. A quantum mechanical analysis corroborated with spectral data offered information about the excited state dipole moments and polarizabilities of the studied compounds. The separation of the supply of universal and specific interactions to the total spectral shift was made based on the regression coefficients from the equations describing the solvatochromic effect. Supplementary information about the composition of the first solvation shell and the energy in the solute-solvent molecular pairs were obtained analyzing the ternary solutions of ADi, i=1, 2, 3 compounds in solvent mixture Methanol (M)+n-Hexane (H).
authors.affiliation: Faculty of Physics, Alexandru Ioan Cuza University, 11 Carol I Bvd., Iasi RO-700506, Romania.
authors.forename: Liliana Mihaela
authors.initials: LM
authors.lastname: Ivan
authors.affiliation: Faculty of Physics, Alexandru Ioan Cuza University, 11 Carol I Bvd., Iasi RO-700506, Romania.
authors.forename: Valentina
authors.initials: V
authors.lastname: Closca
authors.affiliation: "Gr.T. Popa" University of Medicine and Pharmacy, Faculty of Medicine, 16 University Street, 700115 Iasi, Romania.
authors.forename: Marin
authors.initials: M
authors.lastname: Burlea
authors.affiliation: ''Petru Poni" Institute of Macromolecular Chemistry, 41 A, Aleea Grigore Ghica Voda, Iasi RO-700487, Romania.
authors.forename: Elena
authors.initials: E
authors.lastname: Rusu
authors.affiliation: ''Petru Poni" Institute of Macromolecular Chemistry, 41 A, Aleea Grigore Ghica Voda, Iasi RO-700487, Romania.
authors.forename: Anton
authors.initials: A
authors.lastname: Airinei
authors.affiliation: Faculty of Physics, Alexandru Ioan Cuza University, 11 Carol I Bvd., Iasi RO-700506, Romania.
authors.forename: Dana Ortansa
authors.initials: DO
authors.lastname: Dorohoi
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D001554:Benzene / Q000737:chemistry*; D004560:Electricity; D004583:Electrons; D006586:Hexanes / Q000737:chemistry; D000432:Methanol / Q000737:chemistry; D008958:Models, Molecular; D008970:Molecular Weight; D011789:Quantum Theory; D012044:Regression Analysis; D012996:Solutions; D012997:Solvents
chemical_list: D001391:Azo Compounds; D006586:Hexanes; D012996:Solutions; D012997:Solvents; C026385:n-hexane; D001554:Benzene; D000432:Methanol
keywords: Azo-benzene derivatives; Electronic absorption spectra; Excited state dipole moment and polarizability; Interaction energy in molecular pairs