Electronic States of <i>p</i>-Benzoquinone. IV. Infrared Spectrum and Assignment of Vibrational Frequencies in the Ground Electronic State

Anno, Tosinobu; Sadô, Akira

doi:10.1246/bcsj.31.734

Cited by 36 publications

(12 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 2b shows the results of indexing the data from this study with the refined unit cell. Limited information on the normal modes of vibration of THQ was found in the literature, but the vibrational spectra of THQ collected during this study under atmospheric conditions have some similarities to that previously observed for the parent molecule of 1,4benzoquinone [13,[18][19][20][21]. With twenty-two atoms per molecular unit of THQ, sixty unique normal modes of vibration are dictated for THQ at ambient pressure.…”

Section: A Properties At Ambient Pressuresupporting

confidence: 55%

High-pressure polymorphism of the electrochemically active organic molecule tetrahydroxy-p-benzoquinone

Ciezak-Jenkins

2016

Journal of Molecular Structure

View full text Add to dashboard Cite

The structural and chemical response of tetrahydroxy-p-benzoquinone to isothermal compression to near 20 GPa have been studied using powder x-ray diffraction and vibrational spectroscopy. Compression beyond 11.5 GPa resulted in the appearance of several new peaks in the x-ray patterns, changes in the peak distribution and intensities, as well as the disappearance of features observed at lower pressures, which when coupled with concomitant changes in the infrared spectrum are indicative of a phase transition. Further analysis of the infrared spectra suggest this phase transition results in an increase in the anharmonicity of the system. Raman spectroscopic experiments indicate the high-pressure phase to be highly photosensitive and easily polymerized.

show abstract

Section: A Properties At Ambient Pressuresupporting

confidence: 55%

High-pressure polymorphism of the electrochemically active organic molecule tetrahydroxy-p-benzoquinone

Ciezak-Jenkins

2016

Journal of Molecular Structure

View full text Add to dashboard Cite

show abstract

“…26,30,31 The assignment of this spectrum, in particular that of the pair of intense bands at 1650-1670 cm…”

Section: Theoretical Discussionmentioning

confidence: 99%

Vibronic spectra of the p-benzoquinone radical anion and cation: a matrix isolation and computational study

Piech

Bally

Ichino

et al. 2014

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

The electronic and vibrational absorption spectra of the radical anion and cation of p-benzoquinone (PBQ) in an Ar matrix between 500 and 40 000 cm À1 are presented and discussed in detail. Of particular interest is the radical cation, which shows very unusual spectroscopic features that can be understood in terms of vibronic coupling between the ground and a very low-lying excited state. The infrared spectrum of PBQ + exhibits a very conspicuous and complicated pattern of features above 1900 cm A notable exception is the antisymmetric CQO stretching vibration, which contributes significantly to the vibronic coupling, but has nevertheless quite small intensity in the cation spectrum. This surprising feature is rationalized on the basis of a simple perturbation analysis.

show abstract

“…1 shows the absorption spectra of UQ 10 and MQ (vitamin K 1 ). The most prominent signal of UQ seen between 1660 and 1640 cm − 1 includes the coordinates of the ν(C_O) vibration [13,[17][18][19][20][21]. The broadness of the signal of the isolated Q in solution points towards the presence of several interaction partners of C_O group with water.…”

Section: Infrared Spectra On Oxidized Quinonesmentioning

confidence: 99%

“…The first published attempt at a complete vibrational assignment of quinones was made by Anno and Sado [17] who obtained infrared spectra of quinone solutions. Since then a significant number of studies on the vibrational properties of quinones were made describing the signal characteristic for the different redox states, the influence of isotope labeling, and comparing the different types of quinones.…”

Section: Infrared Spectra On Oxidized Quinonesmentioning

confidence: 99%

Infrared spectroscopic markers of quinones in proteins from the respiratory chain

Hellwig

2015

Biochimica et Biophysica Acta (BBA) - Bioenergetics

View full text Add to dashboard Cite

In bioenergetic systems quinones play a central part in the coupling of electron and proton transfer. The specific function of each quinone binding site is based on the protein-quinone interaction that can be described by means of reaction induced FTIR difference spectroscopy, induced for example by light or electrochemically. The identification of sites in enzymes from the respiratory chain is presented together with the analysis of the accommodation of different types of quinones to the same enzyme and the possibility to monitor the interaction with inhibitors. Reaction induced FTIR difference spectroscopy is shown to give an essential information on the general geometry of quinone binding sites, the conformation of the ring and of the substituents as well as essential structural information on the identity of the amino-acid residues lining this site. This article is part of a Special Issue entitled: Vibrational spectroscopies and bioenergetic systems.

show abstract

Electronic States of p-Benzoquinone. IV. Infrared Spectrum and Assignment of Vibrational Frequencies in the Ground Electronic State

Cited by 36 publications

References 16 publications

High-pressure polymorphism of the electrochemically active organic molecule tetrahydroxy-p-benzoquinone

High-pressure polymorphism of the electrochemically active organic molecule tetrahydroxy-p-benzoquinone

Vibronic spectra of the p-benzoquinone radical anion and cation: a matrix isolation and computational study

Infrared spectroscopic markers of quinones in proteins from the respiratory chain

Contact Info

Product

Resources

About