scholarly journals Mapping the multi-step mechanism of a photoredox catalyzed atom-transfer radical polymerization reaction by direct observation of the reactive intermediates

2020 ◽  
Vol 11 (17) ◽  
pp. 4475-4481 ◽  
Author(s):  
Luke Lewis-Borrell ◽  
Mahima Sneha ◽  
Aditi Bhattacherjee ◽  
Ian P. Clark ◽  
Andrew J. Orr-Ewing
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Real Time ◽  
Radical Polymerization ◽  
Absorption Spectroscopy ◽  
Direct Observation ◽  
Transient Absorption ◽  
Reactive Intermediates ◽  
Transient Absorption Spectroscopy ◽  
Polymerization Reaction ◽  
Step Mechanism

Short-lived intermediates are tracked in real-time by transient absorption spectroscopy during a multi-step photoredox catalysed polymerization reaction.

Black-Box, Real-Time Simulations of Transient Absorption Spectroscopy

2016 ◽  
Vol 7 (8) ◽  
pp. 1590-1595 ◽  
Author(s):  
Triet S. Nguyen ◽  
Joong Hoon Koh ◽  
Susan Lefelhocz ◽  
John Parkhill
Keyword(s):  
Real Time ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Black Box ◽  
Transient Absorption Spectroscopy ◽  
Real Time Simulations

scholarly journals Direct Observation of S2–S1 Internal Conversion in Pyrene by Femtosecond Transient Absorption

1999 ◽  
Vol 19 (1-4) ◽  
pp. 375-379 ◽  
Author(s):  
Frederik V. R. Neuwahl ◽  
Paolo Foggi
Keyword(s):  
Time Constant ◽  
Absorption Spectroscopy ◽  
Direct Observation ◽  
Internal Conversion ◽  
Transient Absorption ◽  
Conversion Process ◽  
Transient Absorption Spectroscopy ◽  
Kinetic Measurements ◽  
State Population ◽  
Femtosecond Transient Absorption

UV pulses of 100 fs at 340 nm are utilised to excite pyrene to the vibrationally cold S2 state. Population and depopulation processes occurring in the S2 state are investigated by transient absorption spectroscopy with a white continuum probe. In the first 400 fs after excitation it is possible to measure the growth and disappearance of a band at 585 nm which is assigned to the S14←S2 transition. As a consequence of the internal conversion process from S2 to S1 state, the disappearance of the 585 nm band and the growth of the transient spectrum due to Sn←S1 transitions can be observed. Kinetic measurements of the S2 decay and S1 growing signals provide an estimate of the rate of internal conversion which occurs with a time constant of 150±50 fs.

Direct Observation of an Alkylidenecarbene by Ultrafast Transient Absorption Spectroscopy

2018 ◽  
Vol 122 (34) ◽  
pp. 6852-6855 ◽  
Author(s):  
Lili Du ◽  
Xin Lan ◽  
David Lee Phillips ◽  
William H. Coldren ◽  
Christopher M. Hadad ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Direct Observation ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Ultrafast Transient Absorption ◽  
Ultrafast Transient Absorption Spectroscopy

scholarly journals Combined probes of X-ray scattering and optical spectroscopy reveal how global conformational change is temporally and spatially linked to local structural perturbation in photoactive yellow protein

2016 ◽  
Vol 18 (13) ◽  
pp. 8911-8919 ◽  
Author(s):  
Tae Wu Kim ◽  
Cheolhee Yang ◽  
Youngmin Kim ◽  
Jong Goo Kim ◽  
Jeongho Kim ◽  
...  
Keyword(s):  
Real Time ◽  
Conformational Change ◽  
Absorption Spectroscopy ◽  
Structural Changes ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Photoactive Yellow Protein ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering

Structural changes in global conformation and chromophore of photoactive yellow protein are probed in real time by time-resolved X-ray solution scattering and transient absorption spectroscopy.

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