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Molecules ◽  
2019 ◽  
Vol 24 (3) ◽  
pp. 509 ◽  
Author(s):  
Derrick Ampadu Boateng ◽  
Mi’Kayla Word ◽  
Katharine Tibbetts

Organic phosphates and phosphonates are present in a number of cellular components that can be damaged by exposure to ionizing radiation. This work reports femtosecond time-resolved mass spectrometry (FTRMS) studies of three organic phosphonate radical cations that model the DNA sugar-phosphate backbone: dimethyl methylphosphonate (DMMP), diethyl methylphosphonate (DEMP), and diisopropyl methylphosphonate (DIMP). Upon ionization, each molecular radical cation exhibits unique oscillatory dynamics in its ion yields resulting from coherent vibrational excitation. DMMP has particularly well-resolved 45 fs ( 732 ± 28 cm − 1 ) oscillations with a weak feature at 610–650 cm − 1 , while DIMP exhibits bimodal oscillations with a period of ∼55 fs and two frequency features at 554 ± 28 and 670–720 cm − 1 . In contrast, the oscillations in DEMP decay too rapidly for effective resolution. The low- and high-frequency oscillations in DMMP and DIMP are assigned to coherent excitation of the symmetric O–P–O bend and P–C stretch, respectively. The observation of the same ionization-induced coherently excited vibrations in related molecules suggests a possible common excitation pathway in ionized organophosphorus compounds of biological relevance, while the distinct oscillatory dynamics in each molecule points to the potential use of FTRMS to distinguish among fragment ions produced by related molecules.


2019 ◽  
Vol 7 (30) ◽  
pp. 9154-9158
Author(s):  
Ying-Shi Guan ◽  
Yong Hu ◽  
Changning Li ◽  
Shenqiang Ren

Here we report a new magnetoelectric coupling approach through organic multiferroic composites, composed of ferroelectric molecular radical solids.


2018 ◽  
Vol 73 (4) ◽  
pp. 433-443 ◽  
Author(s):  
Karim M. Abdel-Hay ◽  
Tarek S. Belal ◽  
Younis Abiedalla ◽  
Amber Thaxton-Weissenfluh ◽  
Jack DeRuiter ◽  
...  

The analytical differentiation of the indole ring regioisomeric chloro-1- n-pentyl-3-(1-naphthoyl)-indoles is described in this report. The regioisomeric chloroindole precursor compounds, N- n-pentyl chloroindole synthetic intermediates, and the target chloro-substituted naphthoylindoles showed the equivalent gas chromatographic elution order based on the position of chlorine substitution on the indole ring. The regioisomeric chloro-1- n-pentyl-3-(1-naphthoyl)-indoles yield electron ionization mass spectra having equivalent major fragments resulting from cleavage of the groups attached to the central indole nucleus. Fragment ions occur at m/z 127 and 155 for the naphthyl and naphthoyl cations common to all indoles having the naphthoyl group substituted at the indole-3 position. Fragments resulting from the loss of the naphthoyl and/or n-pentyl groups from the molecular radical cation yield the cations at m/z 318, 304, 248, and 178. The characteristic (M–17)+ fragment ion at m/z 358 resulting from the loss of OH radical is significant in the mass spectra of all these compounds with 1-naphthoyl groups substituted at the indole-3 position. The vapor phase infrared spectra provide a number of characteristic absorption bands to identify the individual isomers.


2015 ◽  
Vol 7 (2) ◽  
pp. 400-404 ◽  
Author(s):  
Xue Jiang ◽  
Chenghui Li ◽  
Zhou Long ◽  
Xiandeng Hou

In this work, nano-MnO2 was used to selectively enhance molecular/radical emission spectra in an atmospheric ambient temperature dielectric barrier discharge, based on which a portable spectrometer was developed for potential in-field analysis of trace benzene, toluene and xylene.


2014 ◽  
Vol 20 (21) ◽  
pp. 6348-6357 ◽  
Author(s):  
Ambar Banerjee ◽  
Gaurab Ganguly ◽  
Ravi Tripathi ◽  
Nisanth N. Nair ◽  
Ankan Paul

2012 ◽  
Vol 58 ◽  
pp. 63-67 ◽  
Author(s):  
P. Crozet ◽  
G. Tourasse ◽  
A. Ross ◽  
F. Paletou ◽  
A. López Ariste

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