The infrared matrix isolation spectra of carbon dioxide. I. Deuterium matrices : Identification of bands due to carbon dioxide dimers

1982 ◽  
Vol 35 (10) ◽  
pp. 1961 ◽  
Author(s):  
MJ Irvine ◽  
ADE Pullin
Keyword(s):  
Carbon Dioxide ◽  
High Resolution ◽  
Concentration Dependence ◽  
Infrared Spectra ◽  
Matrix Isolation ◽  
Molar Ratios ◽  
Bending Mode ◽  
The Matrix

The infrared spectra of CO2 isolated in deuterium matrices at c.6K are reported for molar ratios of D2/CO2 between 50 and 3200. The bending mode V2 of CO2 appears as a narrow doublet in the matrix spectra. Bands due to CO2 dimers are identified in the V2 region from their concentration dependence and from mixed isotope spectra (12CO2and 13CO2). No dimer bands were observed in the monomer antisymmetric stretching region. In this respect the spectra of CO2 in D2 matrices resemble those in N2 matrices. The observed dimer spectrum is compared with those predicted on the basis of T-shaped and staggered parallel configurations for the dimer and is interpreted as favouring the latter configuration. The desirability of obtaining matrix spectra at sufficiently high resolution is stressed.

Examinations of the Matrix Isolation Fourier Transform Infrared Spectra of Organic Compounds. Part XIV: Evaluation of Library Search Routines for Identification of Essential Oil Components

1989 ◽  
Vol 43 (6) ◽  
pp. 998-1003 ◽  
Author(s):  
W. M. Coleman ◽  
Bert M. Gordon
Keyword(s):  
Fourier Transform ◽  
Infrared Spectra ◽  
Matrix Isolation ◽  
Fourier Transform Infrared ◽  
Absolute Difference ◽  
Citronella Oil ◽  
Fourier Transform Infrared Spectra ◽  
The Matrix ◽  
Ft Ir ◽  
Lemon Oil

A set of five search routines—absolute difference, absolute derivative, square difference, square derivative, and Euclidean difference—have been applied to the analysis of the matrix isolation/Fourier transform-infrared spectra (MI/FT-IR) of the components of four essential oils: coriander oil, lemon oil, geranium oil, and citronella oil. The routines were tested under a variety of parameters on a diverse set of compounds and IR spectra. Areas of acceptable performance by the routines as well as areas of marginal performance are discussed. Under the conditions of this study, the absolute derivative routine is judged to be the most acceptable of the five.

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.

Infrared spectra reveal box-like structures for a pentamer and hexamer of mixed carbon dioxide–acetylene clusters

2016 ◽  
Vol 18 (3) ◽  
pp. 1381-1385 ◽  
Author(s):  
Mojtaba Rezaei ◽  
J. Norooz Oliaee ◽  
N. Moazzen-Ahmadi ◽  
A. R. W. McKellar
Keyword(s):  
Carbon Dioxide ◽  
High Resolution ◽  
Infrared Spectrum ◽  
Infrared Spectra

The hexamer (CO2)4–(C2H2)2 is characterized by its high-resolution infrared spectrum.

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.

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

1988 ◽  
Vol 42 (4) ◽  
pp. 666-670 ◽  
Author(s):  
W. M. Coleman ◽  
Bert M. Gordon
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Organic Compounds ◽  
Infrared Spectra ◽  
Nearest Neighbor ◽  
Matrix Isolation ◽  
Fourier Transform Infrared ◽  
Absorption Bands ◽  
The Matrix ◽  
Chain Lengths

A series of β-diketones and alkenes have been examined by matrix isolation Fourier transform infrared spectroscopy. The matrix experiment readily detects the presence of extensive keto-enol tautomerization in selected β-diketones. Certain absorption bands in the IR could be used to estimate the extent of the tautomerization. The data gathered on the alkenes found their absorption bands to occur in the same regions (±5 cm−1) as those found for VP and SS phases. Minimal nearest-neighbor (aggregation) interactions were found. These results are in contrast to those found for aldehydes, ketones, and acids of similar chain lengths.

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

1988 ◽  
Vol 42 (2) ◽  
pp. 304-309 ◽  
Author(s):  
W. M. Coleman ◽  
Bert M. Gordon
Keyword(s):  
Fourier Transform ◽  
Organic Compounds ◽  
Vapor Phase ◽  
Infrared Spectra ◽  
Matrix Isolation ◽  
Fourier Transform Infrared ◽  
Argon Matrix ◽  
Fourier Transform Infrared Spectra ◽  
The Matrix ◽  
Ft Ir

Matrix isolation Fourier transform infrared (MI/FT-IR) data has been presented that documents the presence of discrete conformers in an argon matrix for a series of ketones. The distribution of conformers in the matrix was related to the structure of the molecule, in that rigid structures (i.e., small rings, bicyclic systems, and unsaturated systems) displayed simple carbonyl absorption patterns relative to those of their less rigid counterparts. Also, conformer isolation was seen for halosubstituted ketones. These results are in agreement with previous findings concerning the vapor-phase (VP) spectra of these molecules.

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