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dc.contributor.authorSánchez C.O.
dc.contributor.authorSobarzo P.
dc.contributor.authorSchott E.
dc.contributor.authorZarate X.
dc.contributor.authorBustos C.
dc.date.accessioned2020-09-02T22:28:50Z
dc.date.available2020-09-02T22:28:50Z
dc.date.issued2015
dc.identifier10.1007/s13726-015-0379-3
dc.identifier.citation24, 11, 911-918
dc.identifier.issn10261265
dc.identifier.urihttps://hdl.handle.net/20.500.12728/6363
dc.descriptionSchiff base oligomers obtained by self-condensation from monomers containing simultaneously amino and aldehyde groups are rare in the literature. Novel conjugated oligomers were synthesized by self-condensation of 5-(4-aminophenyl) aryl-2-carboxaldehyde prepared in situ from the corresponding nitro homologous compounds. The oligomers were characterized by spectroscopic methods. Band gap and absorption effect on the oligomers in the presence and absence of metal triflates were surveyed. The oligomers presented good UV–Vis absorption and a 2.2 eV band gap. In the presence of metal triflates, a maximum absorption shift toward longer wavelengths took place. As a result of this, the band gap decreased to 1.8 eV. This value has been the lowest band gap reported for Schiff base oligomers and polymers. Some oligomers dissolved in m-cresol containing metal triflate have afforded blue solutions with maximum wavelength of 571 nm that decrease as triflate concentration increases. Furthermore, to give a better explanation on UV–Vis observed transitions, the oligomeric structure was simulated using time-dependent density functional theory (TD-DFT) calculations to see the involved orbitals in the UV–Vis transitions. The calculated band gap for the oligomer was in very good agreement with the experimental results. Furthermore, the TD-DFT calculations showed that the transitions were delocalized over the whole structure. © 2015, Iran Polymer and Petrochemical Institute.
dc.language.isoen
dc.publisherSpringer-Verlag London Ltd
dc.subjectLow-band gap oligomers
dc.subjectMetallic triflates
dc.subjectOligomers
dc.subjectOptical properties
dc.subjectSelf-condensation
dc.subjectComplexation
dc.subjectCondensation
dc.subjectDensity functional theory
dc.subjectMetals
dc.subjectOligomers
dc.subjectOptical properties
dc.subjectSpectroscopic analysis
dc.subjectHomologous compounds
dc.subjectLow band gap
dc.subjectOligomeric structure
dc.subjectSchiff base oligomer
dc.subjectSelf-condensation
dc.subjectSpectroscopic method
dc.subjectTime dependent density functional theory
dc.subjectTriflates
dc.subjectEnergy gap
dc.titleNovel Schiff base self-condensed oligomers in complexation with metallic triflates of low-band gap properties
dc.typeArticle


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