PMID- 21265513
OWN - NLM
STAT- MEDLINE
DCOM- 20120618
LR  - 20120405
IS  - 1520-5126 (Electronic)
IS  - 0002-7863 (Linking)
VI  - 133
IP  - 6
DP  - 2011 Feb 16
TI  - A new spectral window on retinal protein photochemistry.
PG  - 1626-9
LID - 10.1021/ja1087387 [doi]
AB  - A VIS pump/hyperspectral NIR probe study of all-trans-retinal protonated Schiff 
      base (RPSB) in ethanol is presented. Upon irradiation, a short-lived absorption 
      band covers the recorded range of lambda = 1-2 mum. It decays to reveal the tail of 
      S(1) emission at lambda < 1.3 mum, along with a residual absorption at longer 
      wavelengths, both of which decay with the known kinetics of internal conversion 
      to S(0). The existence of this hitherto unrecorded excited-state absorption deep 
      in the NIR will require a revision of current models for RPSB electronic 
      structure. The phenomenological similarity of these observations with ultrafast 
      NIR studies of carotenoids raises the question of whether three, and not two, 
      electronic states participate in RPSB photochemistry as well. The relevance of 
      these observations to retinal protein photochemistry is discussed.
FAU - Loevsky, Boris
AU  - Loevsky B
AD  - Institute of Chemistry and the Farkas Center for Light-Induced Processes, The 
      Hebrew University, Jerusalem 91904, Israel.
FAU - Wand, Amir
AU  - Wand A
FAU - Bismuth, Oshrat
AU  - Bismuth O
FAU - Friedman, Noga
AU  - Friedman N
FAU - Sheves, Mordechai
AU  - Sheves M
FAU - Ruhman, Sanford
AU  - Ruhman S
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, Non-P.H.S.
DEP - 20110125
PL  - United States
TA  - J Am Chem Soc
JT  - Journal of the American Chemical Society
JID - 7503056
RN  - 0 (Eye Proteins)
RN  - 0 (Schiff Bases)
SB  - IM
MH  - Eye Proteins/*chemistry
MH  - *Photochemical Processes
MH  - Retina/*chemistry
MH  - Schiff Bases/chemistry
MH  - *Spectrum Analysis
EDAT- 2011/01/27 06:00
MHDA- 2012/06/19 06:00
CRDT- 2011/01/27 06:00
PHST- 2011/01/27 06:00 [entrez]
PHST- 2011/01/27 06:00 [pubmed]
PHST- 2012/06/19 06:00 [medline]
AID - 10.1021/ja1087387 [doi]
PST - ppublish
SO  - J Am Chem Soc. 2011 Feb 16;133(6):1626-9. doi: 10.1021/ja1087387. Epub 2011 Jan 
      25.