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Intriguing Heteroleptic Zn$^{II}$ bis(dipyrrinato) Emitters in the Far-Red Region With Large Pseudo-Stokes Shift for Bioimaging

Tabone, Roberta; Feser, Dominik; Lemma, Enrico D.; Schepers, Ute; Bizzarri, Claudia

Abstract:
Novel heteroleptic ZnII bis(dipyrrinato) complexes were prepared as intriguing emitters. With our tailor-made design, we achieved far-red emissive complexes with a photoluminescence quantum yield up to 45% in dimethylsulfoxide and 70% in toluene. This means that heteroleptic Zn$^{II}$ bis(dipyrrinato) complexes retain very intense emission also in polar solvents, in contrast to their homoleptic counterparts, which we prepared for comparing the photophysical properties. It is evident from the absorption and excitation spectra that heteroleptic complexes present the characteristic features of both ligands: the plain dipyrrin (L$_{p}$) and the π-extended dipyrrin (L$_{π}$). On the contrary, the emission comes exclusively from the π-extended dipyrrin L$_{π}$, suggesting an interligand nonradiative transition that causes a large pseudo-Stokes shift (up to 4,600 cm$_{-1}$). The large pseudo-Stokes shifts and the emissive spectral region of these novel heteroleptic Zn$^{II}$ bis(dipyrrinato) complexes are of great interest for bioimaging applications. Thus, their high biocompatibiliy with four different cell lines make them appealing as new fluorophores for cell imaging.


Verlagsausgabe §
DOI: 10.5445/IR/1000139177
Veröffentlicht am 22.10.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Organische Chemie (IOC)
Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2296-2646
KITopen-ID: 1000139177
Erschienen in Frontiers in Chemistry
Verlag Frontiers Media
Band 9
Seiten 754420
Nachgewiesen in Scopus
Web of Science
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