Study of H+NO2 in an Argon Matrix between 4 and 14°K; The Infrared Spectra of Matrix‐Isolated cis‐ and trans‐HONO

1971 ◽  
Vol 54 (2) ◽  
pp. 598-603 ◽  
Author(s):  
William A. Guillory ◽  
Charles E. Hunter
Keyword(s):  
Infrared Spectra ◽  
Argon Matrix ◽  
Cis And Trans

Infrared spectra of some matrix isolated organoisothiocyanate molecules

1985 ◽  
Vol 63 (7) ◽  
pp. 2000-2006 ◽  
Author(s):  
J. R. Durig ◽  
J. F. Sullivan ◽  
D. T. Durig ◽  
Stephen Cradock
Keyword(s):  
Ambient Temperature ◽  
Infrared Spectra ◽  
Vibrational Spectra ◽  
Large Amplitude ◽  
Matrix Material ◽  
Low Frequency ◽  
Conclusive Evidence ◽  
Argon Matrix ◽  
Cis And Trans

The infrared (3500 to 300 cm−1) spectra of methylisothiocyanate, ethylisothiocyanate, isopropylisothiocyanate, and cyclopropylisothiocyanate isolated in argon and nitrogen matrices have been recorded. In general, the spectra were more complex in the nitrogen matrices and, for ethylisothiocyanate, nearly all of the fundamentals appeared as doublets in the nitrogen matrix but for the most part as single bands in the argon matrix. No evidence could be found for a second conformer for either ethylisothiocyanate or isopropylisothiocyanate. Even though cyclopropylisothiocyanate has been shown to exist as the cis and trans conformers at ambient temperature, little conclusive evidence could be found for two isomers in the infrared matrix material. The complex spectra observed in the NCS antisymmetric stretching region as well as in the 520 cm−1 region appear to arise in part from combinations involving the low-frequency large amplitude CNC bend or asymmetric torsion of these organoisothiocyanate molecules. It appears that the vibrational spectra of these molecules are not sensitive to the orientation of the NCS moiety.

The Photolysis of Matrix Isolated cis-Thionylimide. 2. The Identification and Infrared Spectra of trans-HNSO and NSO

1975 ◽  
Vol 53 (15) ◽  
pp. 2331-2336 ◽  
Author(s):  
Peter O. Tchir ◽  
Richard D. Spratley
Keyword(s):  
Hydrogen Bond ◽  
Force Field ◽  
Intramolecular Hydrogen Bond ◽  
Infrared Spectra ◽  
Low Energy ◽  
Argon Matrix ◽  
Using Data ◽  
Argon Matrices ◽  
Intramolecular Hydrogen ◽  
Cis And Trans

It is shown that the low energy (λ > 3000 Å) photolysis of cis-HNSO in an argon matrix leads to formation of trans-HNSO. Four i.r. absorptions are observed and assigned for trans-HNSO and an approximate partial force field is calculated using data from isotopic substitutions. A comparison is made of the i.r. spectra of cis- and trans-HNSO using the intramolecular hydrogen bond of the cis form as a basis for explanation of the differences. Photolysis of cis-HNSO in argon matrices using vacuum u.v. light (1216 Å) has resulted in a single i.r. absorption at 1195 cm−1 which has been assigned to the radical, NSO.

Argon matrix Raman and infrared spectra of SF5Cl, SF5Br, and S2F10

1976 ◽  
Vol 62 (3) ◽  
pp. 449-457 ◽  
Author(s):  
R.R. Smardzewski ◽  
R.E. Noftle ◽  
W.B. Fox
Keyword(s):  
Infrared Spectra ◽  
Argon Matrix

Hydrogen bonding and conformation in cis- and trans-2-alkoxy-3-hydroxytetrahydrofurans

1968 ◽  
Vol 46 (1) ◽  
pp. 21-24 ◽  
Author(s):  
W. W. Zajac Jr. ◽  
F. Sweet ◽  
R. K. Brown
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectra ◽  
Hydroxyl Absorption ◽  
Cis And Trans ◽  
In Cis ◽  
Infrared Data ◽  
Hydrogen Bonded

Infrared spectra show both free and hydrogen bonded hydroxyl absorption in several trans-2-alkoxy-3-hydroxytetrahydrofurans. The extent of non-bonded hydroxyl is greater than that of bonded hydroxyl. Suggestions are made of possible conformations which might account for the infrared data.

Infrared spectra of the CO–H2O 1–1 cluster trapped in an argon matrix

2001 ◽  
Vol 114 (14) ◽  
pp. 6134-6141 ◽  
Author(s):  
Hisashi Abe ◽  
Koichi M. T. Yamada
Keyword(s):  
Infrared Spectra ◽  
Argon Matrix

Argon Matrix Infrared Spectroscopic Evidence for the Generation of Pentatetraenone by Flash Pyrolysis of Suitable Precursors

1988 ◽  
Vol 41 (2) ◽  
pp. 225 ◽  
Author(s):  
RFC Brown ◽  
KJ Coulston ◽  
FW Eastwood ◽  
MJ Irvine ◽  
ADE Pullin
Keyword(s):  
Carbon Atom ◽  
Infrared Spectra ◽  
Spectral Region ◽  
Narrow Band ◽  
Broad Band ◽  
Carbonyl Carbon Atom ◽  
Carbonyl Carbon ◽  
Argon Matrix ◽  
Spectroscopic Evidence ◽  
Argon Mixture

Five compounds were investigated as precursors for the pyrolytic generation of pentatetraenone, H2C=C=C=C=C=O. These were (1)-(4): 3- ethenylidenebicyclo [2.2.1]hept-5-ene with the following 2,2 substituents : H, COOCOCF3 (1); H, 13COOCOCF3 (1′); (COOCOCF3)2 (2); (COO)2C(CH3)(OCH3) (3); (COO)2Si(CH3)2 (4) and 5-(3′- methylenebicyclo [2.2.1]hept-5′-en-2′-ylidene)-2,2-dimethyl-1,3-dioxan-4,6-dione (5). The five precursors were pyrolysed in a stream of argon at temperatures in the range 350-725°C and the pyrolysate -argon mixture condensed on a CsI plate at c. 10 K. Infrared spectra were obtained between 4000 and 250 cm-1. All five precursors gave two strong bands in the spectral region 2070-2250 cm-1, possibly attributable to pentatetraenone. At lower pyrolytic temperatures the more intense of the two bands was a broad band centred at c. 2128 cm-1 [precursors (1)- (4)] or at c. 2094 cm-1 [precursor (5)]. At higher pyrolytic temperatures these bands were diminished in intensity and replaced by a narrow band at 2207 cm-1 for all five precursors. Bands due to the expected other products for each pyrolysis reaction to form pentatetraenone were observed. H2C413CO ( pentatetraenone substituted by 13C at the carbonyl carbon atom) was prepared by pyrolysis of precursor (1′). We assign the broad bands at c. 2128 cm-1 [precursors (1)-(4)] and at c. 2094 [precursor (5)] to incompletely pyrolysed precursor in which cyclopentadiene has been retained but decomposition in the rest of the molecule has resulted in formation of a =C=C=O group. Bands at 2207, 2068 and 1726 cm-1 we assign to v2-v4 of pentatetraenone. Corresponding bands at 2168, 2056 and 1720 cm-1 are observed in the spectrum of H2C413CO.

Theoretical and Experimental Studies of Enflurane. Infrared Spectra in Solution, in Low-Temperature Argon Matrix and Blue Shifts Resulting from Dimerization

2007 ◽  
Vol 111 (42) ◽  
pp. 12228-12238 ◽  
Author(s):  
Danuta Michalska ◽  
Dariusz C. Bieńko ◽  
Bogusława Czarnik-Matusewicz ◽  
Maria Wierzejewska ◽  
Camille Sandorfy ◽  
...  
Keyword(s):  
Low Temperature ◽  
Infrared Spectra ◽  
Experimental Studies ◽  
Argon Matrix

1H-1,3-Diazepines and Ketenimines from Cyanotetrazolopyridines

2008 ◽  
Vol 61 (8) ◽  
pp. 592 ◽  
Author(s):  
Chris Addicott ◽  
Curt Wentrup
Keyword(s):  
Infrared Spectra ◽  
Ring Opening ◽  
Ring Expansion ◽  
Secondary Amines ◽  
Argon Matrix ◽  
The Matrix ◽  
Nitrogen Elimination ◽  
Isolated Species

Cyano-substituted tetrazolo[1,5-a]pyridines/2-azidopyridines 8T and 15T undergo thermal ring opening to the azides 8A and 15A. Solution photolysis causes nitrogen elimination and ring expansion to 1,3-diazacyclohepta-1,2,4,6-tetraenes 10 and 17, which react with alcohols to afford 2-alkoxy-1H-1,3-diazepines, with secondary amines to 2-dialkylamino-5H-1,3-diazepines, and with water to 1,3-diazepin-2-ones (12–14, 19, 21). Argon matrix photolysis of the azides affords the diazacycloheptatetraenes 10 and 17 as principal products together with ring-opened dicyanovinylketenimines 11 and 18. The matrix-isolated species were identified on the basis of comparison of the infrared spectra with those calculated at the B3LYP/6–31+G* level.

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