Tunable linear and nonlinear optical properties from room temperature phosphorescent cyclic triimidazole-pyrene bio-probe
Articolo
Data di Pubblicazione:
2021
Citazione:
Tunable linear and nonlinear optical properties from room temperature phosphorescent cyclic triimidazole-pyrene bio-probe / A. Previtali, W. He, A. Forni, D. Malpicci, E. Lucenti, D. Marinotto, L. Carlucci, P. Mercandelli, G. Terraneo, M.A. Ortenzi, C. Botta, R.T.K. Kwok, J.W.Y. Lam, B.Z. Tang, E. Cariati. - In: CHEMISTRY-A EUROPEAN JOURNAL. - ISSN 0947-6539. - 27:67(2021 Dec 01), pp. 16690-16700. [10.1002/chem.202102839]
Abstract:
Organic materials with multiple emissions tunable by external stimuli represent a great challenge. TTPyr, crystallizing in different polymorphs, shows a very rich photophyisics comprising excitation-dependent fluorescence and phosphorescence at ambient conditions, and mechanochromic and thermochromic behavior. Transformation among the different species has been followed by thermal and X-ray diffraction analysis and the emissive features interpreted through structural results and DFT/TDDFT calculations. Particularly intriguing is the polymorph obtained at high temperature, TTPyr(HT), whose non-centrosymmetric structure guarantees an SHG efficiency 10 times higher than that of standard urea. Its crystal packing, where only the TT units are strongly rigidified by π-π stacking interactions while the Pyr moieties possess partial conformational freedom, is responsible for the observed dual fluorescence. The potentialities of TTPyr for bioimaging have been successfully established.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
bioimaging; phosphorescence; photophysics; polymorphs; time-resolved spectroscopy
Elenco autori:
A. Previtali, W. He, A. Forni, D. Malpicci, E. Lucenti, D. Marinotto, L. Carlucci, P. Mercandelli, G. Terraneo, M.A. Ortenzi, C. Botta, R.T.K. Kwok, J.W.Y. Lam, B.Z. Tang, E. Cariati
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