PMID- 30507189
OWN - NLM
STAT- MEDLINE
DCOM- 20191015
LR  - 20191015
IS  - 1520-5207 (Electronic)
IS  - 1520-5207 (Linking)
VI  - 122
IP  - 51
DP  - 2018 Dec 27
TI  - Excited State Vibrational Spectra of All- trans Retinal Derivatives in Solution 
      Revealed By Pump-DFWM Experiments.
PG  - 12271-12281
LID - 10.1021/acs.jpcb.8b08495 [doi]
AB  - The ultrafast structural changes during the photoinduced isomerization of the 
      retinal-protonated Schiff base (RPSB) is still a poorly understood aspect in the 
      retinal's photochemistry. In this work, we apply pump-degenerate four-wave mixing 
      (pump-DFWM) to all- trans retinal (ATR) and retinal Schiff bases (RSB) to resolve 
      coherent high- and low-frequency vibrational signatures from excited electronic 
      states. We show that the vibrational spectra of excited singlet states in these 
      samples exhibit pronounced differences compared to the relaxed ground state. 
      Pump-DFWM results indicate three major features for ATR and RSB. (i) Excited 
      state vibrational spectra of ATR and RSB consist predominately of low-frequency 
      modes in the energetic range 100-500 cm(-1). (ii) Excited state vibrational 
      spectra show distinct differences for excitation in specific regions of 
      electronic transitions of excited state absorption and emission. (iii) 
      Low-frequency modes in ATR and RSB are inducible during the entire lifetime of 
      the excited electronic states. This latter effect points to a transient molecular 
      structure that, following initial relaxation between different excited electronic 
      states, does not change anymore over the lifetime of the finally populated 
      excited electronic state.
FAU - Kraack, Jan Philip
AU  - Kraack JP
AUID- ORCID: 0000-0001-7078-0565
AD  - Physikalisch-Chemisches Institut , Ruprecht-Karls Universitat Heidelberg , 
      D-69210 Heidelberg , Germany.
FAU - Motzkus, Marcus
AU  - Motzkus M
AD  - Physikalisch-Chemisches Institut , Ruprecht-Karls Universitat Heidelberg , 
      D-69210 Heidelberg , Germany.
FAU - Buckup, Tiago
AU  - Buckup T
AUID- ORCID: 0000-0002-1194-0837
AD  - Physikalisch-Chemisches Institut , Ruprecht-Karls Universitat Heidelberg , 
      D-69210 Heidelberg , Germany.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20181214
PL  - United States
TA  - J Phys Chem B
JT  - The journal of physical chemistry. B
JID - 101157530
RN  - 0 (Schiff Bases)
RN  - RR725D715M (Retinaldehyde)
SB  - IM
MH  - Light
MH  - Retinaldehyde/*chemistry/radiation effects
MH  - Schiff Bases/chemistry/radiation effects
MH  - Spectrum Analysis/methods
MH  - Stereoisomerism
MH  - Vibration
EDAT- 2018/12/07 06:00
MHDA- 2019/10/16 06:00
CRDT- 2018/12/04 06:00
PHST- 2018/12/07 06:00 [pubmed]
PHST- 2019/10/16 06:00 [medline]
PHST- 2018/12/04 06:00 [entrez]
AID - 10.1021/acs.jpcb.8b08495 [doi]
PST - ppublish
SO  - J Phys Chem B. 2018 Dec 27;122(51):12271-12281. doi: 10.1021/acs.jpcb.8b08495. 
      Epub 2018 Dec 14.