Time-Resolved Signatures Across the Intramolecular Response in Substituted Cyanine Dyes

1. Time-Resolved Signatures Across the Intramolecular Response in Substituted Cyanine Dyes Muath Nairat Dantus Research Group 6/20/2017 Nairat, M. et al., Phys. Chem. Chem. Phys. 2017,19, 14085

2. Cyanines structure & optical response Absorbance Guennic B. et al Acc. Chem. Res. 2015, 48, 530 Rosspeintner A. et al Annu. Rev. Phys. Chem. 2015, 64, 247

3. Applications of cyanines Solar energy capture Biomedical imaging Photodynamic therapy Zhao Y. et al Adv. Optical Mater. 2014, 2, 606 Ormond A. B. et al Materials. 2013, 6, 817 Fang C. et al Sci. Rep. 6, 21013

4. Cyanine’s electronic structures Unsubstituted cyanine: Substituted cyanine: Non-polar response Polar response

5. Synthesis

6. Optical properties Abs. blue shift Stokes shift Substituent Nucleophilicity

7. Experimental Setup

8. Positive Chirp Negative Chirp TL Red Blue

9. Chirp response

10. Ground state structure PBEα/6-311+G(3d,p) α=0.456

11. Ground state structure PBEα/6-311+G(3d,p) α=0.456

12. Excited state potential energy surface CASSCF/6-31G(d)

13. Excited state potential energy surface

14. Excited state potential energy surface

15. Energy relaxation on PES MEP: minimum energy path

16. Thank you nairatmu@chemistry.msu.edu We are looking for students! Dantus Research Group Nairat, M. et al., Phys. Chem. Chem. Phys. 2017,19, 14085

17. Fluorescence Stimulated Emission