The Elusive Ethenediselone, Se=C=C=Se

2014 ◽  
Vol 67 (9) ◽  
pp. 1195 ◽  
Author(s):  
Carl Th. Pedersen ◽  
Ming Wah Wong ◽  
Kazuo Takimiya ◽  
Pascal Gerbaux ◽  
Robert Flammang
Keyword(s):  
Mass Spectrometry ◽  
Ground State ◽  
Matrix Isolation ◽  
Triplet Molecule ◽  
Precursor Molecules

The neutral ethenediselone, Se=C=C=Se, has been characterised by neutralisation–reionisation mass spectrometry, which implies a minimum lifetime of the order of microseconds. Tetraselenafulvalene 1 and tetramethyltetraselenafulvalene 2 were used as precursor molecules. Flash vacuum thermolysis (FVT) of these compounds with isolation of the products in Ar matrices permitted the identification of ethyne, 2-butyne, CSe2, and selenoketene, H2C=C=Se, but at best traces of Se=C=C=Se survived the FVT/matrix isolation experiment. Multiconfigurational calculations indicate that Se=C=C=Se is a ground state triplet molecule with a very small singlet-triplet gap.

scholarly journals Analysis of IHchothecene Mycotoxins in Contaminated Grains by Gas Chromatography/Matrix Isolation/Fourier Transform Infrared Spectroscopy and Gas Chromatography/Mass Spectrometry

1996 ◽  
Vol 79 (5) ◽  
pp. 1116-1123 ◽  
Author(s):  
Magdi M Mossoba ◽  
Sarah Adams ◽  
John A G Roach ◽  
Mary W Trucksess
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Fourier Transform ◽  
Sweet Corn ◽  
Matrix Isolation ◽  
Fourier Transform Infrared ◽  
Epoxide Ring ◽  
Absorption Bands ◽  
Spectral Bands ◽  
Infrared Spectral

Abstract Gas chromatography/matrix isolation/Fourier transform infrared (GC/MI/FTIR) spectroscopy and GC/mass spectrometry (MS) were used to confirm the identities of trimethylsilyl (TMS) derivatives of trichothecene mycotoxins in naturally contaminated grains. Infrared spectral bands observed in the fingerprint region were unique for 10 trichothecene standards. Characteristic absorption bands were observed for the ester (near 1750 cm-1) and ketone (near 1700 cm-1) carbonyl stretching vibrations, the acetate CH3 symmetric bend (1370 cm-1), the epoxide ring (1262 cm-1), the trimethylsilyl CH3 in-plane deformation (1253 cm-1), the ester (O)C-O asymmetric stretching vibration (near 1244 cm-1), and several other bands including intense features due to the TMS function. Infrared bands observed under cryogenic matrix isolation conditions were compared with those found at room temperature in a potassium bromide matrix for 5 of these standards. Identities of deoxynivalenol (DON) from barley and mixed feed, nivalenol from wheat and barley, and DON and fusarenon-x from sweet corn were confirmed by comparison of their infrared spectral bands with those of standards. The identity of DON in the same test samples of sweet corn was confirmed further by GC/MS. GC/MS was also used to quantitate the levels of DON (67-455 ppm) in sweet corn test samples.

Absorption Spectra of Ground-State and Low-Lying Electronic States of Copper Nitrosyl: A Rare Gas Matrix Isolation Study

2005 ◽  
Vol 109 (45) ◽  
pp. 10264-10272 ◽  
Author(s):  
Lahouari Krim ◽  
Xuefeng Wang ◽  
Laurent Manceron ◽  
Lester Andrews
Keyword(s):  
Absorption Spectra ◽  
Ground State ◽  
Matrix Isolation ◽  
Electronic States ◽  
Rare Gas

Power of Mass Spectrometry for Analyzing Organometallic Molecules as Precursor of Nanomaterials

1999 ◽  
Vol 581 ◽  
Author(s):  
G.F. Strouse ◽  
J.J. Gaumet
Keyword(s):  
Mass Spectrometry ◽  
Electrospray Mass Spectrometry ◽  
Rapid Analysis ◽  
Cone Voltage ◽  
Nano Materials ◽  
Spectrometry Method ◽  
Organometallic Precursor ◽  
Organometallic Molecules ◽  
Organometallic Precursors ◽  
Precursor Molecules

ABSTRACTA mass spectrometry method (Electrospray Mass Spectrometry [ESMS]) for analyzing organometallic precursors of nano-materials is described. We show that application of low-cone voltage ESMS is a useful technique for the rapid analysis of intact organometallic precursor molecules when both positive and negative ionic modes are analyzed. This method shows promise for extrapolation to analysis of the dynamics of growth in nano-scale materials.

The gas-phase reactions of SiCl4 and Si2Cl6 with CH3OH and C2H5OH: An investigation by mass spectrometry and matrix-isolation infrared spectroscopy

2004 ◽  
Vol 6 (13) ◽  
pp. 3264 ◽  
Author(s):  
Nicola Goldberg ◽  
Matthew J. Almond ◽  
J. Steven Ogden ◽  
J. Pat Cannady ◽  
Robin Walsh ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Infrared Spectroscopy ◽  
Gas Phase ◽  
Matrix Isolation ◽  
Gas Phase Reactions

Measurement of an Electronic Resonance in a Ground-State, Gas-Phase Acetophenone Cation via Strong-Field Mass Spectrometry

2013 ◽  
Vol 4 (10) ◽  
pp. 1587-1591 ◽  
Author(s):  
Timothy Bohinski ◽  
Katharine Moore Tibbetts ◽  
Maryam Tarazkar ◽  
Dmitri Romanov ◽  
Spiridoula Matsika ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Phase ◽  
Ground State ◽  
Strong Field ◽  
Field Mass ◽  
Electronic Resonance

ChemInform Abstract: Neutralization-Reionization Mass Spectrometry and Matrix Isolation of Some 9-Silaanthracenes.

ChemInform ◽  
2010 ◽  
Vol 22 (14) ◽  
pp. no-no
Author(s):  
Y. VAN DEN WINKEL ◽  
B. L. M. VAN BAAR ◽  
F. BICKELHAUPT ◽  
W. KULIK ◽  
C. SIERAKOWSKI ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Matrix Isolation

Neutralization-Reionization Mass Spectrometry and Matrix Isolation of Some 9-Silaanthracenes

1991 ◽  
Vol 124 (1) ◽  
pp. 185-190 ◽  
Author(s):  
Yvar Van Den Winkel ◽  
Ben L. M. Van Baar ◽  
Friedrich Bickelhaupt ◽  
Willem Kulik ◽  
Claudia Sierakowski ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Matrix Isolation
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