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http://hdl.handle.net/2289/7491
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DC Field | Value | Language |
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dc.contributor.author | Karmakar, Shreetama | - |
dc.contributor.author | Ambastha, Abhinandan | - |
dc.contributor.author | Dharmadhikari, J.A. | - |
dc.contributor.author | +4 Co-Authors | - |
dc.date.accessioned | 2020-07-06T08:46:03Z | - |
dc.date.available | 2020-07-06T08:46:03Z | - |
dc.date.issued | 2020-06 | - |
dc.identifier.citation | The Journal of Physical Chemistry Letters, 2020, Vol.11, p4842−4848 | en_US |
dc.identifier.issn | 1948-7185 | - |
dc.identifier.uri | http://hdl.handle.net/2289/7491 | - |
dc.description | Restricted Access | en_US |
dc.description.abstract | Optically triggered twisted intramolecular charge transfer (TICT) states in donor–acceptor chromophores form the molecular basis for designing bioimaging probes that sense polarity, microviscosity, and pH in vivo. However, a lack of predictive understanding of the “twist” localization precludes a rational design of TICT-based dyes. Here, using femtosecond stimulated Raman spectroscopy, we reveal a distinct Raman signature of the TICT state for a stilbazolium-class mitochondrial staining dye. Resonance-selective probing of 4-N,N-diethylamino-4″-N′-methyl-stilbazolium tosylate (DEST) tracks the excited-state structure of the dye as it relaxes to a TICT state on a picosecond time scale. The appearance of a remarkably blue-shifted C=C stretching mode at 1650 cm–1 in the TICT state is attributed to the “twist” of a single bond adjacent to the ethylenic π-bridge in the DEST backbone based on detailed electronic structure calculations and vibrational mode analysis. Our work demonstrates that the π-bridge, connecting the donor and acceptor moieties, influences the spatial location of the “twist” and offers a new perspective for designing organelle-specific probes through cogent tuning of backbone dynamics. | en_US |
dc.language.iso | en | en_US |
dc.publisher | American Chemical Society | en_US |
dc.relation.uri | https://doi.org/10.1021/acs.jpclett.0c01124 | en_US |
dc.rights | 2020 American Chemical Society | en_US |
dc.title | Transient Raman Snapshots of the Twisted Intramolecular Charge Transfer State in a Stilbazolium Dye | en_US |
dc.type | Article | en_US |
dc.additional | Supporting Information Available | en_US |
Appears in Collections: | Research Papers (LAMP) |
Files in This Item:
File | Description | Size | Format | |
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2020_J Phys Chem Lett_Vol.11_p4842−4848.pdf Restricted Access | Restricted Access | 2.33 MB | Adobe PDF | View/Open Request a copy |
2020_J Phys Chem Lett_Vol.11_Supl Info.pdf Restricted Access | Restricted Access | 4.59 MB | Adobe PDF | View/Open Request a copy |
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