The Infrared Spectra of Dichloroacetic Acid Derivatives: Characteristic Absorption Frequencies of the -CHCl2 Group

1986 ◽  
Vol 40 (1) ◽  
pp. 1-3 ◽  
Author(s):  
J. E. Katon ◽  
Thomas H. Stout ◽  
George G. Hess
Keyword(s):  
Infrared Spectra ◽  
Dichloroacetic Acid ◽  
Characteristic Absorption ◽  
Absorption Frequencies

Anomalies in the Infrared Spectra of Mixed Carbonate Precipitates

1968 ◽  
Vol 22 (5) ◽  
pp. 497-501 ◽  
Author(s):  
Gene E. Kalbus ◽  
Eugene A. Berg ◽  
Lee H. Kalbus
Keyword(s):  
Infrared Spectra ◽  
Anomalous Behavior ◽  
Absorption Bands ◽  
Characteristic Absorption ◽  
Quantitative Measurements ◽  
Mixed Carbonate

When a mixture of cations in solution is precipitated by the addition of carbonate, the resulting mixed carbonate precipitate, when subjected to infrared examination, does not usually exhibit the individually characteristic absorption bands due to each of the carbonates constituting the mixture. Instead, various interesting anomalies such as blending of bands, shifting of positions, and changing of intensities are observed. Such anomalous behavior may hamper any qualitative or quantitative measurements on such samples. Representative spectra and possible explanations for some of these anomalies are presented.

The Infrared Spectra of Some 1-(2-Thienyl)-3- and -4-Thiaalkanes

1979 ◽  
Vol 33 (6) ◽  
pp. 578-581
Author(s):  
Norman G. Foster ◽  
Bernice B. Bonner ◽  
Robert W. Higgins
Keyword(s):  
Absorption Band ◽  
Infrared Spectra ◽  
Thiophene Ring ◽  
Absorption Bands ◽  
Characteristic Absorption ◽  
Molecular Weights ◽  
Ring Compounds ◽  
Major Absorption Band

The infrared spectra of six 1-(2-thienyl)-3-thiaalkanes and seven 1-(2-thienyl)-4-thiaalkanes (molecular weights from 186 to 270) were obtained for the 4000 to 400 cm−1 range. These spectra are compared with spectra of other thiophene ring compounds substituted in the 2-position for their characteristic absorption bands. The spectra agree with other spectra as to the major absorption band around 680 cm−1 and the 2-substitution overtone pattern. A method of distinguishing between the two groups of compounds from moderate peaks in the 600 to 500 cm−1 (KBr) region is shown. Interference from the 2-alkylthiophenes and the 1-(2-thienyl)-1-thiaalkanes does not occur.

3,5-Dialkyl Phenols and Their Allyl Substitution Products: Infrared Absorption Spectra and Interpretation of Characteristic Frequency Shifts

1970 ◽  
Vol 53 (2) ◽  
pp. 275-287
Author(s):  
J -Y T Chen ◽  
Nancy C Oates ◽  
David Firestone
Keyword(s):  
Absorption Spectra ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Characteristic Frequency ◽  
Frequency Shifts ◽  
Mass Effects ◽  
Infrared Absorption Spectra ◽  
Absorption Frequencies ◽  
Allyl Substitution

Abstract The infrared spectra of five 3,5-dialkyl phenols, six 2-allyl-3,5-dialkyl phenols, and five 4-allyl-3,5-dialkyl phenols are presented. The characteristic infrared absorption frequencies are tabulated in correlation charts. The hyperconjugation and mass effects of substituent groups are discussed.

Infrared Spectra of Some α,ω-Dinitroxy Alkanes

1966 ◽  
Vol 20 (6) ◽  
pp. 380-383 ◽  
Author(s):  
R. D. Barefoot ◽  
A. R. Lawrence
Keyword(s):  
Infrared Spectra ◽  
Absorption Bands ◽  
Frequency Shifts ◽  
Characteristic Absorption

The infrared spectra of eight α, ω-dinitroxy alkanes are examined, and frequency shifts and related intensities of characteristic absorption bands are discussed.

Infrared spectra of diphenylethine and diphenylethine-d10

1969 ◽  
Vol 47 (2) ◽  
pp. 235-242 ◽  
Author(s):  
Cesare Pecile ◽  
Bruno Lunelli
Keyword(s):  
Crystal Field ◽  
Infrared Spectra ◽  
Crystal Plane ◽  
Solid Samples ◽  
Monosubstituted Benzene ◽  
Field Effects ◽  
Symmetry Classes ◽  
Isotopic Shifts ◽  
Model Predictions ◽  
Absorption Frequencies

The infrared spectra of diphenylethine and diphenylethine-d10 have been measured in the 4000–33 cm−1 region both for solution and solid samples. Polarized spectra of oriented crystals, (001) crystal plane, allow segregation of most bands into their respective symmetry classes. The slightness of correlation crystal field effects suggested by the comparison between crystal and solution spectra is confirmed by measurements on dilute isotopic solutions. The oriented gas model predictions are a useful guide despite some well-identified deviations.The assignment of the infrared active fundamentals is proposed on the basis of the dichroic indications and the isotopic shifts. Most of the relevant absorption frequencies of diphenylethine and diphenylethine-d10 are recognized as characteristic of a monosubstituted benzene and the spectra are interpretable on the basis of two phenyl groups weakly interacting through the acetylenic bridge.

An Infrared Study of Metal Isopropoxide Precursors for SrTiO3

1984 ◽  
Vol 32 ◽  
Author(s):  
R. E. Riman ◽  
D. M. Haaland ◽  
C.J.M. Northrup ◽  
H. K. Bowen ◽  
A. Bleier
Keyword(s):  
Ir Spectra ◽  
Detailed Analysis ◽  
Infrared Spectra ◽  
Spectral Features ◽  
Absorption Bands ◽  
Infrared Study ◽  
Characteristic Absorption ◽  
Local Environments ◽  
Insight Into ◽  
Hydrolysis Reactions

ABSTRACTA Sr/Ti bimetallic isopropoxide complex was synthesized by two methods. The complex served as a precursor to the production of homogeneous SrTiO3 powders via alkoxide hydrolysis. Infrared spectra were obtained for Sr(OPri)2, Ti(OPri)4, and the product of the syntheses. In addition, the IR spectra of the solutions of each of the alkoxides were followed as hydrolysis reactions proceeded. Detailed analysis of the spectral features support the existence of a 1:1 Sr/Ti bimetallic alkoxide. The new Sr/Ti compound exhibits characteristic absorption bands at (1017, 993, 972, 961 cm−1), (844, 838, 827 cm−1) and (620, 596, and 572 −1). A band at 819−1 might also be associated with the new Sr/Ti bimetallic alkoxide. The infrared spectra suggest that the isopropoxide ligands in the bimetallic alkoxide are in at least three separate local environments. This information offers insight into possible structures for the complex.

The Infra-Red Spectra of Porphyrins and their Iron Complexes

1951 ◽  
Vol 4 (4) ◽  
pp. 579 ◽  
Author(s):  
JE Falk ◽  
JB Willis
Keyword(s):  
Carbonyl Group ◽  
Absorption Spectra ◽  
Iron Complexes ◽  
Characteristic Absorption ◽  
Infra Red ◽  
Absorption Frequencies

Infra-red absorption spectra between 4000 and 670 cm.-1 have been measured for a number of porphyrins and their iron complexes (haems). These spectra should be of use in the identification and purification of porphyrins, and enable position isomers to be distinguished. Characteristic absorption frequencies for the carbonyl group in different environments have been found.

scholarly journals Isolasi Kitin dari Cangkang Kepiting Laut (Portunus pelagicus Linn.) serta Pemanfaatannya untuk Adsorpsi Fe dengan Pengompleks 1,10-fenantrolin

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Dewi Murniati ◽  
Mudasir Mudasir
Keyword(s):  
Solid Phase Extraction ◽  
Infrared Spectra ◽  
Solid Phase ◽  
Phase Extraction ◽  
Crab Shell ◽  
Portunus Pelagicus ◽  
Characteristic Absorption ◽  
Nitrogen Contents

Abstrak Telah dilakukan isolasi kitin dari cangkang kepiting laut (Portunus pelagicus Linn.) yang digunakan sebagai fasa padat dalam Adsorpsi kompleks tris(1,10-fenantrolin)besi(II). Optimasi berat kitin dan penentuan eluen yang sesuai telah dipelajari dalam penelitian ini dengan tujuan untuk meningkatkan recovery kompleks yang optimum. Hasil penelitian menunjukkan bahwa spektra Inframerah dari kitin hasil isolasi memberikan bilangan gelombang yang hampir sama dengan kitin standar. Penentuan kadar abu, kadar nitrogen dan kadar karbon serta derajat deasetilasi dari hasil analisis kitin hasil isolasi memberikan hasil yang memenuhi syarat kitin standar. Berat kitin optimum untuk adsorpsi kompleks [Fe(phen)3]2+ 0,4 ppm adalah 0,2 g yang memberikan % recovery sekitar 55,56% dan eluen yang sesuai adalah campuran etanol : HCl (6 : 4, v/v). Kata Kunci: Isolasi kitin, Adsorpsi, Besi, 1,10-fenantrolin dan Eluen. Abstrack The isolated crab shell chitin from the sea crab (Portunus pelagicus Linn.) for solid-phase extraction  [Fe(1,10-phenantroline)3]2+complex based. The weight optimized of chitin and searched of eluent were compatible. The result showed that infrared spectra of the isolated chitin has similar characteristic absorption with that of the standard chitin. The measurement of ash contents, nitrogen contents, and carbon contents and de-acetylated degrees from analysis result of the isolated chitin up to the standard chitin. The weight optimized of chitin used for solid-phase extraction of 0.4 ppm trace(1.10-phenanthroline)iron(II) complex are 0.2 g with % recovery 55,56% and the eluent compatible are the mixed ethanol: HCl (6:4, v/v).   Keywords: Chitin isolation, Adsorption, Iron, 1,10-phenantroline and Eluent.

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