title: Solvent effects on the photophysical properties of poly[1,4-dihydroxyanthraquinoneimine-1,3-bis(phenylene-ester-methylene)tetramethyldisiloxane].
abstract: Absorption and fluorescence spectra of a polyquinoneimine, PQI, built on 1,4-dihydroxyanthraquinone and a siloxane diamine, 1,3-bis(amino-phenylene-ester-methylene)tetramethyldisiloxane, have been investigated in solvents of different polarities. The effect of solvents on the spectral properties was investigated using Lippert-Mataga and Bakhshiev polarity functions and Catalán's multiple linear regression approach. Absorption and fluorescence spectra in studied solvents exhibit hypsochromic and bathochromic shifts, respectively. The polarity of the solvent was the main parameter which changes the spectral properties of PQI. Also, the binary mixtures of chloroform with methanol and dimethyl sulfoxide were used to analyze the intermolecular interactions and preferential solvation. The preferential solvation parameters (local mole fraction (X₂(L)), excess function (δs₂) and preferential solvation constant (KPS)) were calculated from spectral data and discussed as a function of cosolvent content. The values of quantum yield, decreased linearly with increasing solvent polarity (for non-polar and polar solvents).
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania.
authors.forename: Petronela Pascariu
authors.initials: PP
authors.lastname: Dorneanu
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania. Electronic address: michalupu@yahoo.co.uk.
authors.forename: Mihaela
authors.initials: M
authors.lastname: Homocianu
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania.
authors.forename: Ionut Radu
authors.initials: IR
authors.lastname: Tigoianu
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania.
authors.forename: Anton
authors.initials: A
authors.lastname: Airinei
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania.
authors.forename: Mirela
authors.initials: M
authors.lastname: Zaltariov
authors.affiliation: "Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, Iaşi 700487, Romania.
authors.forename: Maria
authors.initials: M
authors.lastname: Cazacu
mesh_terms: D000880:Anthraquinones / Q000737:chemistry*; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D000432:Methanol / Q000737:chemistry; D055668:Photochemical Processes; D012833:Siloxanes / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013055:Spectrophotometry, Infrared; D014050:Toluene / Q000737:chemistry
chemical_list: D000880:Anthraquinones; D012833:Siloxanes; D012997:Solvents; C000601617:poly(1,4-dihydroxyanthraquinoneimine-1,3-bis(phenylene-ester-methylene)tetramethyldisiloxane); D014050:Toluene; D000432:Methanol; D004121:Dimethyl Sulfoxide
keywords: Absorption spectra; Emission spectra; Polyquinoneimine; Preferential solvation; Quantum yield; Solvent effects