About the origin of the large Stokes shift in aminoalkyl substituted heptamethine cyanine dyes

Author:

Sissa Cristina12345ORCID,Painelli Anna12345ORCID,Terenziani Francesca12345ORCID,Trotta Massimo6785ORCID,Ragni Roberta91011125ORCID

Affiliation:

1. Dipartimento di Scienze Chimiche

2. della Vita e della Sostenibilità Ambientale

3. Università di Parma

4. Parma

5. Italy

6. CNR-IPCF

7. Institute for Physical and Chemical Processes

8. 70125 Bari

9. Dipartimento di Chimica

10. Università degli Studi di Bari “Aldo Moro”

11. I-

12. 70126 Bari

Abstract

Aminoalkyl substituted heptamethine cyanines show a large Stokes shift, ascribed to the geometry relaxation upon photoexcitation that drives the molecule from a distorted ground state structure to a planar and cyanine-like excited state.

Funder

European Commission

Università degli Studi di Parma

Publisher

Royal Society of Chemistry (RSC)

Subject

Physical and Theoretical Chemistry,General Physics and Astronomy

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