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.

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.

Preparation, Infrared and Raman Spectra, and Stereochemistries of Pentacoordinate Trimethylphosphine Complexes, MX4•P(CH3)3 and MX4•P(CD3)3 where M = Ge or Sn and X = Cl or Br

1973 ◽  
Vol 51 (16) ◽  
pp. 2697-2709 ◽  
Author(s):  
D. K. Frieson ◽  
G. A. Ozin
Keyword(s):  
Solid State ◽  
Raman Spectra ◽  
Axial Ligand ◽  
Axial Position ◽  
Infrared And Raman Spectra ◽  
Normal Coordinate ◽  
X Ray ◽  
Trigonal Bipyramidal ◽  
Equatorial Ligand

The 1:1 adducts MX4•PMe3 (M = Ge or Sn; X = Cl or Br) are prepared by recrystallization of the respective 1:2 complexes from excess MX4 acceptor. Solid state infrared and Raman Spectra and X-ray powder photographs suggest that these adducts are all trigonal bipyramidal with the ligand in an axial position. Normal coordinate calculations in C3v symmetry (axial ligand) and Cs symmetry (equatorial ligand) support this assignment. The rather high ν(MP) frequencies indicate unusually strong metal–phosphorus donor bonds in these compounds.

scholarly journals Spectral pre and post processing for infrared and Raman spectroscopy of biological tissues and cells

2016 ◽  
Vol 45 (7) ◽  
pp. 1865-1878 ◽  
Author(s):  
Hugh J. Byrne ◽  
Peter Knief ◽  
Mark E. Keating ◽  
Franck Bonnier
Keyword(s):  
Raman Spectroscopy ◽  
Spectral Data ◽  
Biomedical Applications ◽  
Biological Tissues ◽  
Spectral Quality ◽  
Post Processing ◽  
Factors Influencing ◽  
Infrared And Raman Spectroscopy ◽  
Processing Steps

This review presents the current understanding of the factors influencing the quality of spectra recorded and the pre-processing steps commonly employed to improve on spectral quality, as well as some of the most common techniques for classification and analysis of the spectral data for biomedical applications.

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

scholarly journals Natural monoacetylenes studied by quantum-chemical chemistry

2010 ◽  
Vol 24 (3-4) ◽  
pp. 417-420 ◽  
Author(s):  
Maciej Roman ◽  
Malgorzata Baranska
Keyword(s):  
Raman Spectroscopy ◽  
Vibrational Spectra ◽  
Quantum Chemical ◽  
Theoretical Calculations ◽  
Thiophene Ring ◽  
Vibrational Analysis ◽  
Theoretical Simulation

This study is a part of the project focused on the vibrational analysis of natural mono- and polyacetylenes by using Raman spectroscopy and theoretical calculations. Their vibrational spectra show strong and polarized –C≡C– bands in the region of about 2200 cm–1. Mono- as well as polyacetylenes are supposed to be active in plants yet not available in an isolated form, so theoretical simulation of their vibrational spectra and comparison with the registered ones seems to be an excellent way to confirm or exclude the presence of these compounds in the investigated plants. Such an approach was applied here to analyze polyacetylenes in roots ofCoreopsis grandiflora. According to literature, this plant should contain a monoacetylene substituted by a thiophene ring. Theoretical calculations allowed to confirm this assumption.

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