Argon-matrix isolation of bis(trifluoromethyl)oxirene, perfluoromethylethyloxirene, and their isomeric ketocarbenes

1983 ◽  
Vol 105 (6) ◽  
pp. 1698-1700 ◽  
Author(s):  
M. Torres ◽  
J. L. Bourdelande ◽  
A. Clement ◽  
O. P. Strausz
Keyword(s):  
Matrix Isolation ◽  
Argon Matrix

Matrix-isolation studies of the reactions of iron atoms and iron dimers with acetylene in an argon matrix. The FT-IR spectrum of ethynyliron hydride

1985 ◽  
Vol 107 (25) ◽  
pp. 7559-7562 ◽  
Author(s):  
Ellen S. Kline ◽  
Zakya H. Kafafi ◽  
Robert H. Hauge ◽  
John L. Margrave
Keyword(s):  
Ir Spectrum ◽  
Matrix Isolation ◽  
Argon Matrix ◽  
Ft Ir

Photochemical Reaction Channels of OCS with Cl2, ICl, or IBr Isolated Together in an Argon Matrix:  Isolation ofsyn-Iodocarbonylsulfenyl Bromide

2006 ◽  
Vol 110 (8) ◽  
pp. 2674-2681 ◽  
Author(s):  
Yeny A. Tobón ◽  
Laura I. Nieto ◽  
Rosana M. Romano ◽  
Carlos O. Della Védova ◽  
Anthony J. Downs
Keyword(s):  
Photochemical Reaction ◽  
Matrix Isolation ◽  
Argon Matrix ◽  
Reaction Channels

Argon-Matrix Isolation of Bis(carbomethoxy)thiirene: Formation of Acyl and Carbalkoxythioketenes

1983 ◽  
Vol 38 (10) ◽  
pp. 1208-1212 ◽  
Author(s):  
M. Torres ◽  
A. Clement ◽  
O. P. Strausz
Keyword(s):  
Short Wavelength ◽  
Matrix Isolation ◽  
Argon Matrix ◽  
Quantitative Formation

Abstract Photolysis of argon-matrix isolated 4,5-bis(carbomethoxy)-1,2,3-thiadiazole with λ = 254 or 265 nm resulted in the almost quantitative formation of bis(carbomethoxy)-thiirene (3g). Photolysis of 3g could only be carried out by long irradiation times at short wavelength λ = 210 nm and resulted mainly in extensive fragmentation instead of the formation of bis(carbomethoxy)thioketene, confirming earlier predictions that substituents, especially electron-withdrawing ones, should stabilize the thiirene ring. Methylcarboethoxy and methylacetylthioketene were obtained, however, in the argon-matrix photolysis or flow thermolysis of 4-methyl-5-carboethoxy-or 4-carboethoxy-5-methyl-1,2,3-thiadiazole and 4-acetyl-5-methyl-1,2,3-thiadiazole, respectively.

Examinations of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds: Part XV

1989 ◽  
Vol 43 (6) ◽  
pp. 1004-1008 ◽  
Author(s):  
W. M. Coleman ◽  
Bert M. Gordon
Keyword(s):  
Fourier Transform ◽  
Infrared Spectra ◽  
Matrix Isolation ◽  
Fourier Transform Infrared ◽  
Argon Matrix ◽  
Fourier Transform Infrared Spectra ◽  
The Matrix ◽  
Ft Ir ◽  
Oil Components ◽  
Search Routine

Matrix isolation Fourier transform infrared spectra (MI/FT-IR) of a series of essential oil components have been described. Clear, well-defined differences were detected in the MI/FT-IR spectra of compounds having minor differences in their structure. A library search routine was found to correctly identify components of interest when visual differences were not clearly evident. The presence of discrete conformers in the argon matrix resulted in the presence of split absorptions in the carbonyl band for selected compounds.

Examinations of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds: Part XVI

1989 ◽  
Vol 43 (6) ◽  
pp. 1008-1016 ◽  
Author(s):  
W. M. Coleman ◽  
Bert M. Gordon
Keyword(s):  
Fourier Transform ◽  
Ir Spectra ◽  
Vapor Phase ◽  
Infrared Spectra ◽  
Condensed Phase ◽  
Matrix Isolation ◽  
Absorption Bands ◽  
Argon Matrix ◽  
The Matrix ◽  
The Impact

Information concerning the matrix isolation Fourier transform infrared spectra of a series of alkanes, esters, lactones, lactams, phenols, alcohols, amides, alkenes, and ketones is presented. A comparison between the characteristics of the spectra in two matrices (argon and xenon) as well as in the absence of any matrix (bare gold disk) is drawn. The impact of these matrices on the characteristics of the IR spectra is compared with the impact observed when spectra are gathered in the vapor phase as well as the condensed phase/solid state. For the majority of compounds studied, the major absorption bands of each class of compound fall between higher values for the vapor phase and lower values for the condensed phase when either argon or xenon is used as the matrix gas. The few exceptions are discussed. The absorption bands found in the xenon matrix are usually at a lower energy than are comparable bands in the argon matrix. In most all cases, the values of absorptions for compounds on the bare disk were lower than the comparable values found in the argon matrix. These results represent the first extensive study at 10 K of the effect of different matrix gas hosts and document the proposal that preconceptions of noble gases as inert hosts for the examination of FT-IR spectra at low temperature are not valid.

Argon matrix isolation study of the interaction of VCl4 with (CH3)2CO

2005 ◽  
Vol 733 (1-3) ◽  
pp. 89-94 ◽  
Author(s):  
David A. Kayser ◽  
Bruce S. Ault
Keyword(s):  
Matrix Isolation ◽  
Argon Matrix

Analysis of Nitrocresols and Related Compounds by Gas Chromatography/Matrix-Isolation Infrared Spectrometry

1995 ◽  
Vol 49 (3) ◽  
pp. 286-294 ◽  
Author(s):  
Jeffrey W. Childers ◽  
David F. Smith ◽  
Nancy K. Wilson ◽  
Ruth K. Barbour
Keyword(s):  
Gas Chromatography ◽  
Hydrogen Bonding ◽  
Matrix Isolation ◽  
Broad Band ◽  
Intramolecular Hydrogen Bonding ◽  
Infrared Spectrometry ◽  
Absorption Bands ◽  
Argon Matrix ◽  
Band Splitting ◽  
Matrix Interactions

The capabilities of gas chromatography/matrix-isolation infrared (GC/MIIR) spectrometry for characterizing nitrocresols in air sample extracts were evaluated. The IR spectra of selected nitrocresols were recorded in an argon matrix, in a xenon matrix, in the vapor phase, and in dilute CCl4 solution. The MIIR spectra of the nitrocresols that do not undergo intramolecular hydrogen bonding exhibited split OH stretching bands. Several factors that might cause band splitting, including aggregation, solute–matrix interactions, and the isolation of conformers, were investigated. The presence of aggregates was indicated by a broad band assigned to intermolecular hydrogen bonding in the MIIR spectra of 3-and 4-nitrocresol isomers deposited in an argon matrix at a matrix-to-solute ratio ≤ 283:1. The split OH absorption bands persisted, however, when there was no evidence of aggregate formation. The complexity of the split OH stretching bands was also influenced by steric factors and by the choice of matrix gas. This result suggests that isolation of rotational isomers and solute-matrix interactions also contribute to the band splitting. The presence of the split OH absorption bands did not preclude the use of the GC/MIIR technique to identify several nitrocresols produced from the photooxidation of toluene and NO x.

The Pyrolysis of Butatrienone Precursors: 3,4-Diazatricyclo[5.2.1.02,6]deca-3,8-diene-endo-cis-2,6-dicarboxylic anhydride and Its 5,5-Diphenyl Derivative

1990 ◽  
Vol 43 (3) ◽  
pp. 549 ◽  
Author(s):  
MR Anderson ◽  
RFC Brown ◽  
NR Browne ◽  
FW Eastwood ◽  
GD Fallon ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Infrared Spectroscopy ◽  
Matrix Isolation ◽  
Argon Matrix ◽  
Flash Vacuum Pyrolysis ◽  
Vacuum Pyrolysis

Flash vacuum pyrolysis of the title anhydride (4) gave a poor yield of butatrienone , detected by argon matrix isolation infrared spectroscopy. Similar pyrolysis of the 5,5-diphenyl derivative (8) failed to give diphenylbutatrienone ; the red product (16) is considered to have been formed by dimerization of an intermediate 2H-indenylidenemethanone (15). The crystal structure of (16) has been determined.

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