Synthesis and vibrational spectra of complexes of small carboxylic acids with 18-crown-6

1985 ◽  
Vol 63 (7) ◽  
pp. 1457-1462 ◽  
Author(s):  
Rodrique Savoie ◽  
André Rodrigue ◽  
Marie Pigeon-Gosselin ◽  
Robert Chênevert
Keyword(s):  
Raman Spectroscopy ◽  
Carboxylic Acids ◽  
Vibrational Spectra ◽  
Acid Water ◽  
Neutral Component ◽  
Infrared And Raman Spectroscopy ◽  
O 18

The neutral-component complexes (HCOOH)3•(18-crown-6)2, (CH3COOH)2•18-crown-6, and various halogenated CH3COOH/18-crown-6 adducts have been isolated and studied by infrared and Raman spectroscopy. The halogenated (F, Cl, and Br) derivatives, which occur as (acid•water)x•18-crown-6(x = 1 or 2) adducts, probably have a structure which is similar to that of the known CH2(CN)COOH•H2O•18-crown-6 complex.

Vibrational Spectra, Vibrational Analysis and Stereochemistries of the Pentacoordinate Molecules SiCl3X•N(CH3)3 and SiCl3X•N(CD3)3 where X = H, F, Br, or I

1973 ◽  
Vol 51 (4) ◽  
pp. 609-617 ◽  
Author(s):  
D. Boal ◽  
G. A. Ozin
Keyword(s):  
Raman Spectroscopy ◽  
Vibrational Spectra ◽  
Vibrational Analysis ◽  
Axial Position ◽  
Normal Coordinate ◽  
Trigonal Bipyramidal ◽  
Factors Influencing ◽  
Infrared And Raman Spectroscopy

The thermally unstable compounds SiCl3X•N(CH3)3 and SiCl3X•N(CD3)3 where X = H, F, Br, or I are studied at −196 °C by infrared and Raman spectroscopy. The data are compatible with molecular five coordinate compounds having a trigonal bipyramidal stereochemistry with the ligand trimethylamine always in the axial position. Using the vibrational data and normal coordinate analyses in both the Cs and C3v configurations, X is suggested to be equatorial for H and F and axial for Br and I. The factors influencing the position of X in the compounds are discussed.

New complexes of the hydronium ion with crown ethers: synthesis and vibrational spectra

1984 ◽  
Vol 62 (11) ◽  
pp. 2293-2298 ◽  
Author(s):  
Robert Chénevert ◽  
André Rodrigue ◽  
Pierre Beauchesne ◽  
Rodrigue Savoie
Keyword(s):  
Raman Spectroscopy ◽  
Crown Ethers ◽  
Vibrational Spectra ◽  
Hydronium Ion ◽  
Infrared And Raman Spectroscopy ◽  
Charged Component

The charged-component complexes H3O+•18-crown-6.CF3SO3−, H3O+•18-crown-6.SbF6−, and (H3O+•18-crown-6)2•PtCl62− have been isolated and studied by infrared and Raman spectroscopy, along with the previously reported H3O+•18-crown-6•C1O4− and H3O+•18-crown-6•PF6− adducts. Also synthesized were the corresponding derivatives with BF4− and PtCl62− anions, using dicyclohexano-18-crown-6 as the host for the hydronium ion.

The vibrational spectra of the cyanide ligand revisited: the ν(CN) infrared and Raman spectroscopy of Prussian blue and its analogues

2011 ◽  
Vol 42 (11) ◽  
pp. 2006-2014 ◽  
Author(s):  
Sidney F. A. Kettle ◽  
Eliano Diana ◽  
Edoardo M. C. Marchese ◽  
Enrico Boccaleri ◽  
Pier Luigi Stanghellini
Keyword(s):  
Raman Spectroscopy ◽  
Prussian Blue ◽  
Vibrational Spectra ◽  
Cyanide Ligand ◽  
Infrared And Raman Spectroscopy

Synthesis and vibrational spectra of 1:1 stoichiometric complexes of nitronium and nitrosonium tetrafluoroborate with 18-crown-6

1983 ◽  
Vol 61 (6) ◽  
pp. 1248-1252 ◽  
Author(s):  
Rodrigue Savoie ◽  
Marie Pigeon-Gosselin ◽  
André Rodrigue ◽  
Robert Chénevert
Keyword(s):  
Raman Spectroscopy ◽  
Vibrational Spectra ◽  
Organic Media ◽  
Infrared And Raman Spectroscopy

The macrocyclic ether 18-crown-6 can form 1: 1 stoichiometric complexes with NOBF4 and NO2BF4. These complexes, which are soluble in organic media, have been isolated and studied by infrared and Raman spectroscopy. The spectra suggest that the conformation of the ether in these complexes is essentially that of the highly regular crown of D3d symmetry, the NO+ and NO2+ ions being stuck into the ether cavity.

Identification of filler substances in emeralds by infrared and Raman spectroscopy

2000 ◽  
Vol 26 (1) ◽  
pp. 501-520 ◽  
Author(s):  
L. Kiefert ◽  
H.A. Hänni ◽  
J-P. Chalain ◽  
W. Weber
Keyword(s):  
Raman Spectroscopy ◽  
Infrared And Raman Spectroscopy

scholarly journals Multivariate approach for the authentication of vanilla using infrared and Raman spectroscopy

2021 ◽  
Vol 141 ◽  
pp. 110196
Author(s):  
Ana M. Jiménez-Carvelo ◽  
Margherita Tonolini ◽  
Orla McAleer ◽  
Luis Cuadros-Rodríguez ◽  
Daniel Granato ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Multivariate Approach ◽  
Infrared And Raman Spectroscopy

scholarly journals Authentication of the Botanical and Geographical Origin and Detection of Adulteration of Olive Oil Using Gas Chromatography, Infrared and Raman Spectroscopy Techniques: A Review

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1565
Author(s):  
Eleni Kakouri ◽  
Panagiota-Kyriaki Revelou ◽  
Charalabos Kanakis ◽  
Dimitra Daferera ◽  
Christos S. Pappas ◽  
...  
Keyword(s):  
Gas Chromatography ◽  
Raman Spectroscopy ◽  
Olive Oil ◽  
Nutritional Value ◽  
Review Paper ◽  
Geographical Origin ◽  
Analytical Techniques ◽  
Volatile Fraction ◽  
Olive Oils ◽  
Infrared And Raman Spectroscopy

Olive oil is among the most popular supplements of the Mediterranean diet due to its high nutritional value. However, at the same time, because of economical purposes, it is also one of the products most subjected to adulteration. As a result, authenticity is an important issue of concern among authorities. Many analytical techniques, able to detect adulteration of olive oil, to identify its geographical and botanical origin and consequently guarantee its quality and authenticity, have been developed. This review paper discusses the use of infrared and Raman spectroscopy as candidate tools to examine the authenticity of olive oils. It also considers the volatile fraction as a marker to distinguish between different varieties and adulterated olive oils, using SPME combined with gas chromatography technique.

Synthesis, crystal and molecular structure, and vibrational spectra of the complex (COOH)2•2H2O•18-crown-6

1986 ◽  
Vol 64 (1) ◽  
pp. 142-147 ◽  
Author(s):  
Suzanne Deguire ◽  
François Brisse ◽  
Jacques Ouellet ◽  
Rodrigue Savoie
Keyword(s):  
Molecular Structure ◽  
Hydrogen Bonds ◽  
Oxalic Acid ◽  
Raman Spectra ◽  
Vibrational Spectra ◽  
Crystal And Molecular Structure ◽  
Unit Cell ◽  
Infrared And Raman Spectra ◽  
O 18 ◽  
Stoichiometric Complex

A stoichiometric complex of formula (COOH)2•2H2O•18-crown-6 has been obtained from oxalic acid and the macrocyclic polyether 18-crown-6. The crystals of the complex have a monoclinic unit cell and belong to the P21/c space group. The components in the adduct are linked through hydrogen bonds in a polymer-like fashion: -crown–H2O–HOOCCOOH–OH2–crown–, where the oxalic acid molecules are present in two distinct disordered orientations. The infrared and Raman spectra of the complex are also reported and interpreted.

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