Ms. Lauren Rosch Profile

Lauren Rosch

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 14 March 2023 Presentation + Paper

Shining light on the photophysics of polymethine dyes with chalcogenopyrylium termini

Lauren Rosch, Matthew Crawley, Thomas Rohrabaugh, Trenton Ensley, Ryan O'Donnell, Timothy Cook

Proceedings Volume 12418, 1241804 (2023) https://doi.org/10.1117/12.2650099

KEYWORDS: Dyes, Oxygen, Electrodes, Absorption, Oxidation, Platinum, Tellurium, Spectroscopy, Femtosecond phenomena, Ultrafast phenomena

Read Abstract +

Previous reports of chalcogenopyrylium polymethine dyes establish singlet oxygen yields as high as 12%. Our studies of these systems suggested that the current understanding of the excited state dynamics is incomplete. In fact, we observe no evidence for singlet oxygen generation across a range of experiments. We have carried out steady-state and pulsedlaser kinetic experiments on a family of fourteen dyes, including six novel dyes, selected to vary physical and electronic structure. We have changed the identity of the chalcogen between selenium and tellurium heteroatoms, phenyl, thiophene, tert-butyl substituents, and methine linker length. Excited-state lifetimes were obtained by femtosecond transient absorption spectroscopy. Lifetimes were all sub-300 picoseconds, suggesting rapid relaxation. Furthermore, we observed no evidence of any triplet transient processes; phosphorescence was only observed in samples at 77 K. Variable-temperature NMR experiments implicate rotation of the pyran ring about the methine backbone as a critical determinant of the dynamics of these dyes that distinguishes their photophysics from more rigid analogues.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years