Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Experimental and calculated infrared spectra of disubstituted naphthoquinones

Journal Article · · Spectrochimica Acta. Part A. Molecular and Biomolecular Spectroscopy
 [1];  [2];  [2]
  1. Georgia State University, Atlanta, GA (United States); OSTI
  2. Georgia State University, Atlanta, GA (United States)

In recent years there has been interest in incorporating substituted 1,4-naphthoquinones (NQs) into the A1 binding site in photosystem I (PSI) photosynthetic protein complexes. This interest in part stems from the considerably altered bioenergetics of electron transfer that occur in PSI with such substitutions. Time resolved FTIR studies of PSI complexes with disubstituted NQs incorporated have and currently are being undertaken, and with this in mind it is worth considering FTIR absorption spectra of these disubstituted NQs in solution. Here we present FTIR absorbance spectra for 2-bromo-3-methyl-1,4-naphthoquinone (BrMeNQ), 2-chloromethyl-3-methyl-1,4-naphthoquinone (CMMeNQ) and 2-ethylthio-3-methyl-1,4-naphthoquinone (ETMeNQ) in tetrahydrofuran (THF). The FTIR spectra of these di-substituted naphthoquinones (NQs) were compared to FTIR spectra of 2-methyl-3-phytyl-1,4-naphthoquinone [phylloquinone (PhQ)], 2,3-dimethyl-1,4-naphthoquinone (DMNQ), and 2-methyl-1,4-naphthoquinone (2MNQ). To aid in the assignment of bands in the experimental spectra, density functional theory (DFT) based vibrational frequency calculations for all the substituted NQs in solution were undertaken. The calculated and experimental spectra agree well. By calculating normal mode potential energy distributions, unambiguous quantitative band assignments were made. The calculated and experimental spectra together make predictions about what may be observable in time resolved FTIR difference spectra obtained using PSI with the different NQs incorporated. As a result, time resolved FTIR difference spectra are presented that support these predictions.

Research Organization:
Georgia State University, Atlanta, GA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation Major Research Instrumentation (MRI)
Grant/Contract Number:
SC0017937
OSTI ID:
1977620
Journal Information:
Spectrochimica Acta. Part A. Molecular and Biomolecular Spectroscopy, Journal Name: Spectrochimica Acta. Part A. Molecular and Biomolecular Spectroscopy Journal Issue: C Vol. 268; ISSN 1386-1425
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (37)

Incorporation of 2,3-Disubstituted-1,4-Naphthoquinones into the A1 Binding Site of Photosystem I Studied by EPR and ENDOR Spectroscopy journal November 2009
Time-resolved infrared spectroscopy in the study of photosynthetic systems journal September 2016
Redox potentials of ubiquinone, menaquinone, phylloquinone, and plastoquinone in aqueous solution journal August 2017
Reversible inhibition and reactivation of electron transfer in photosystem I journal May 2020
Protein-quinone interactions in the bacterial photosynthetic reaction center: light-induced FTIR difference spectroscopy of the quinone vibrations journal July 1996
Modeling of the P700+ Charge Recombination Kinetics with Phylloquinone and Plastoquinone-9 in the A1 Site of Photosystem I journal December 2002
FTIR Difference Spectroscopy in Combination with Isotope Labeling for Identification of the Carbonyl Modes of P700 and P700+ in Photosystem I journal February 2004
Protein–cofactor interactions in bioenergetic complexes: The role of the A1A and A1B phylloquinones in Photosystem I journal September 2009
Infrared spectroscopic markers of quinones in proteins from the respiratory chain journal January 2015
Modeling electron transfer in photosystem I journal June 2016
Quinones in the A1 binding site in photosystem I studied using time-resolved FTIR difference spectroscopy journal September 2017
Time-resolved step-scan FTIR difference spectroscopy for the study of photosystem I with different benzoquinones incorporated into the A1 binding site journal November 2018
Fourier transform visible and infrared difference spectroscopy for the study of P700 in photosystem I from Fischerella thermalis PCC 7521 cells grown under white light and far-red light: Evidence that the A–1 cofactor is chlorophyll f journal June 2019
Time-resolved FTIR difference spectroscopy for the study of quinones in the A1 binding site in photosystem I: Identification of neutral state quinone bands journal June 2020
Time-resolved visible and infrared absorption spectroscopy data obtained using photosystem I particles with non-native quinones incorporated into the A1 binding site journal June 2016
Vibrational Energy Distribution Analysis (VEDA): Scopes and limitations journal October 2013
Modeling the A1 binding site in photosystem journal October 2006
The role of menaquinones (vitamin K2) in human health journal April 2013
The Binding Sites of Quinones in Photosynthetic Bacterial Reaction Centers Investigated by Light-Induced FTIR Difference Spectroscopy: Assignment of the QA Vibrations in Rhodobacter sphaeroides Using 18O- or 13C-Labeled Ubiquinones and Vitamin K1 journal April 1994
Binding sites of quinones in photosynthetic bacterial reaction centers investigated by light-induced FTIR difference spectroscopy: Binding of chainless symmetrical quinones to the QA site of Rhodobacter sphaeroides. journal October 1994
Binding Sites of Quinones in Photosynthetic Bacterial Reaction Centers Investigated by Light-Induced FTIR Difference Spectroscopy: Assignment of the Interactions of Each Carbonyl of QA in Rhodobacter sphaeroides Using Site-Specific 13C-Labeled Ubiquinone journal December 1994
Kinetics of Electron Transfer from Q A to Q B in Photosystem II journal October 2001
Energetics of Quinone-Dependent Electron and Proton Transfers in Rhodobacter sphaeroides Photosynthetic Reaction Centers journal January 2005
The A-FXto FA/BStep inSynechocystis6803 Photosystem I Is Entropy Driven journal January 2006
New Scale Factors for Harmonic Vibrational Frequencies Using the B3LYP Density Functional Method with the Triple-ζ Basis Set 6-311+G(d,p) journal March 2005
Uncertainties in Scaling Factors for ab Initio Vibrational Frequencies journal September 2005
The Structure and Function of Quinones in Biological Solar Energy Transduction: A Cyclic Voltammetry, EPR, and Hyperfine Sub-Level Correlation (HYSCORE) Spectroscopy Study of Model Naphthoquinones journal June 2013
Molecular properties in solution described with a continuum solvation model journal October 2002
Incorporation of a high potential quinone reveals that electron transfer in Photosystem I becomes highly asymmetric at low temperature journal January 2012
Uncertainties in scaling factors forab initiovibrational zero-point energies journal March 2009
Mechanism of proton-coupled quinone reduction in Photosystem II journal December 2012
Inverted-region electron transfer as a mechanism for enhancing photosynthetic solar energy conversion efficiency journal August 2017
Efficient exchange of the primary quinone acceptor QA in isolated reaction centers of Rhodopseudomonas viridis journal October 1997
Modelling electron transfer in photosystem I: limits and perspectives journal March 2019
Avogadro: an advanced semantic chemical editor, visualization, and analysis platform journal August 2012
Time-Resolved FTIR Difference Spectroscopy in Combination with Specific Isotope Labeling for the Study of A1, the Secondary Electron Acceptor in Photosystem 1 journal June 2008
Glotaran : A Java -Based Graphical User Interface for the R Package TIMP journal January 2012