Vishnumurthy, K.A.Sunitha, M.S.Philip, R.Vasudeva Adhikari, A.V.2026-02-052011Reactive and Functional Polymers, 2011, 71, 12, pp. 1119-112813815148https://doi.org/10.1016/j.reactfunctpolym.2011.08.011https://idr.nitk.ac.in/handle/123456789/27142A new series of donor-acceptor-type conjugated polymers (P1 and P2) carrying a diphenyl amine moiety were synthesized via Wittig condensation technique. The polymers structures were well established by FT-IR, 1H NMR, elemental analysis and gel permeation chromatographic techniques. They exhibited good thermal stability with an onset decomposition temperature of approximately 325 °C under nitrogen atmosphere. The optical and electrochemical properties of the polymers were studied by UV-vis, fluorescence emission spectroscopy and cyclic voltammetry. They exhibited good fluorescence in dilute solutions and showed solvatochromic behavior in various polar solvents. The electrochemical studies revealed that the polymers possess low-lying LUMO energy levels that ranging from -3.47 to -3.73 eV and high-lying HOMO energy levels that ranging from -5.57 to -5.81 eV. The thirdorder nonlinear optical properties of the polymers were investigated using the Z-scan technique. The effective two-photon absorption (TPA) coefficients (?) of the polymers were found to be 0.645 × 10-10 and 0.212 × 10-10 m/W. © 2011 Elsevier Ltd. All rights reserved.Chromatographic techniquesCyanopyridinesDilute solutionDiphenyl aminesDiphenylamineElectrochemical studiesFluorescence emission spectroscopyGel permeationHOMO energy levelsLUMO energy levelsNew seriesNitrogen atmospheresOnset decomposition temperaturesPhotonic materialsPolar solventsSolvatochromic behaviorThird order nonlinear optical propertiesTwo-photon absorptionsZ-scan techniqueAnilineCyclic voltammetryElectrochemical propertiesEmission spectroscopyFluorescenceNonlinear opticsOptical emission spectroscopyOptical propertiesThiopheneTwo photon processesConjugated polymers