pH-dependent ultrafast photodynamics of p-hydroxyphenacyl: deprotonation accelerates the photo-uncaging reaction

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F10974938%3A_____%2F25%3A25_88_16" target="_blank" >RIV/10974938:_____/25:25_88_16 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1039/d5cp01049g" target="_blank" >https://doi.org/10.1039/d5cp01049g</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1039/d5cp01049g" target="_blank" >10.1039/d5cp01049g</a>

Result language
angličtina
Original language name
pH-dependent ultrafast photodynamics of p-hydroxyphenacyl: deprotonation accelerates the photo-uncaging reaction
Original language description
Photolabile protecting groups (PPGs) possess broad application potential as they allow spatially and temporally controlled release of the protected group. While the photochemistry of many PPGs has been studied in detail, data under aqueous conditions or depending on the pH are extremely rare. However, for applications under biological conditions in water, knowledge about the photochemistry under these is critical. Here, we studied the pH-dependent reaction dynamics of para-hydroxyphenacyl (pHP), one prominent example of PPGs, by ultrafast transient absorption spectroscopy and quantum chemical simulation. At neutral pH, the para-hydroxyl group of pHP is protonated and photoproduct formation occurs within less than 1 ns from a triplet state. At basic pH, the main scaffold gets deprotonated leading to a bathochromic shift of the characteristic absorption. Upon deprotonation the substrate release occurs directly from a singlet state, shortcutting the rate determining step of intersystem crossing (ISC) in the neutral case, resulting in an acceleration of the photochemical reaction with photoproduct formation observed at similar to 1 ps.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project
<a href="/en/project/GM21-09692M" target="_blank" >GM21-09692M: Clarifying quantum limits in biomolecules by utilizing entangled photons generated from protein bound cofactor modeled on orange carotenoid protein</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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