Tunable Linear and Nonlinear Optical Properties from Room Temperature Phosphorescent Cyclic Triimidazole‐Pyrene Bio‐Probe. Issue 67 (29th October 2021)

• Record Type: Journal Article
• Authors: Previtali, Andrea; He, Wei; Forni, Alessandra; Malpicci, Daniele; Lucenti, Elena; Marinotto, Daniele; Carlucci, Lucia; Mercandelli, Pierluigi; Ortenzi, Marco Aldo; Terraneo, Giancarlo; Botta, Chiara; Kwok, Ryan Tsz Kin; Lam, Jacky Wing Yip; Tang, Ben Zhong; Cariati, Elena
• Is Part Of: Chemistry. Volume 27:Issue 67(2021)
• Page Start: 16690
• Page End: 16700
• Publication Date: 2021-10-29
• Subjects: bioimaging -- polymorphs -- phosphorescence -- photophysics -- time-resolved spectroscopy; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.202102839
• Languages: English
• ISSNs: 0947-6539

Abstract

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 analyses and the emissive features interpreted through structural results and DFT/TDDFT calculations. Particularly intriguing is the polymorph TTPyr(HT), serendipitously obtained at high temperature but stable also at room temperature, 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. Abstract : TT‐Pyr bioprobe crystallizes in different polymorphs and solvates. Starting from solvate structures, thermal transformation to room temperature and, finally, high temperature polymorphs is accompanied by variation in the phopotophysical behavior which has been interpreted through theoretical and structural analyses. Dual fluorescence, RTP and SHG signal are observed for the non‐centrosymmetric TT‐Pyr(HT) polymorph.