title: Photophysical behavior of some aromatic poly(1,3,4-oxadiazole-ether)s derivatives.
abstract: The change in electronic absorption and emission spectra of two fluorinated poly(1,3,4-oxadiazole-ether)s in neat and binary solvent mixtures has been studied. The optical properties, absorption and photoluminescence of these polymers were investigated in solution and in solid state. The results were discussed as a function of solvent nature, excitation wavelength and local solvent composition, X2. The Catalan solvent scale was used for describing the solvatochromic shifts of the absorption and emission bands. The following binary solvent mixtures were used: chloroform-N,N'-dimethylformamide (CHCl3-DMF), chloroform-dimethyl sulfoxide (CHCl3-DMSO), and dimethylformamide-dimethyl sulfoxide (DMF-DMSO) and the influence of their composition on the absorption and emission maxima has been analyzed. The preferential solvation parameters such as local mole fraction (X2(L)), excess function (δs2) and preferential solvation constant (KPS) were determined.
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, 700487 Iasi, Romania.
authors.forename: A M
authors.initials: AM
authors.lastname: Ipate
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, 700487 Iasi, Romania. Electronic address: michalupu@yahoo.co.uk.
authors.forename: M
authors.initials: M
authors.lastname: Homocianu
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, 700487 Iasi, Romania.
authors.forename: C
authors.initials: C
authors.lastname: Hamciuc
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, 700487 Iasi, Romania.
authors.forename: A
authors.initials: A
authors.lastname: Airinei
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, 700487 Iasi, Romania.
authors.forename: M
authors.initials: M
authors.lastname: Bruma
mesh_terms: D004121:Dimethyl Sulfoxide / Q000737:chemistry; D004126:Dimethylformamide / Q000737:chemistry; D004987:Ethers / Q000737:chemistry; D008163:Luminescent Measurements; D010069:Oxadiazoles / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004987:Ethers; D010069:Oxadiazoles; D011108:Polymers; C583463:1,3,4-oxadiazole; D004126:Dimethylformamide; D004121:Dimethyl Sulfoxide
keywords: Binary mixtures; Electronic absorption spectra; Emission spectra; Preferential solvation; Solvent effect