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.

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]

Tunable linear and nonlinear optical properties from room temperature phosphorescent cyclic triimidazole-pyrene bio-probe

A. Previtali
Primo
;
D. Malpicci;L. Carlucci
;
P. Mercandelli;M.A. Ortenzi;E. Cariati
Ultimo
2021

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.
bioimaging; phosphorescence; photophysics; polymorphs; time-resolved spectroscopy
Settore CHIM/03 - Chimica Generale e Inorganica
11-ott-2021
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/876130
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