Infrared spectra of carbocations and CH4+ in helium

2021 ◽  
Author(s):  
Julia Ann Davies ◽  
Shengfu Yang ◽  
Andrew M Ellis
Keyword(s):  
Ir Spectra ◽  
Infrared Spectra ◽  
Electron Ionization ◽  
Weakly Bound ◽  
Cation Complexes

Infrared (IR) spectra of several hydrocarbon cations are reported, namely CH3+, CH4+, CH5+, CH5+(CH4) and C2H5+. The spectra were generated from weakly-bound helium-cation complexes formed by electron ionization of helium...

Evolution of IR spectra of a weakly-bound OCO⋯HCl complex with increasing CO2 density from the gas to liquid phase

2001 ◽  
Vol 598 (2-3) ◽  
pp. 205-211 ◽  
Author(s):  
K.S Rutkowski ◽  
K.G Tokhadze ◽  
P Lipkowski ◽  
A Koll ◽  
R Ahmedjonov ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Ir Spectra ◽  
Weakly Bound ◽  
Gas To Liquid ◽  
Co2 Density

Far-Infrared Spectra of Saturated Esters

1968 ◽  
Vol 22 (6) ◽  
pp. 697-713 ◽  
Author(s):  
J. E. Saunders ◽  
J. J. Lucier ◽  
F. F. Bentley
Keyword(s):  
Ir Spectra ◽  
Infrared Spectra ◽  
Frequency Characteristic ◽  
Far Infrared ◽  
Empirical Correlations ◽  
Straight Chain ◽  
Structural Differences ◽  
Characteristic Group ◽  
The Individual ◽  
Far Infrared Spectra

The ir spectra of 89 saturated aliphatic-branched and straight-chain esters are reported for the region 350–50 cm−1 and empirical correlations of the band frequencies are classified by the alcohol component. It is found that there is no consistent series of bands for all samples studied but within the individual classes, several discrete areas of absorption are specified. This verified that these vibrations are more sensitive to structural differences than the higher-frequency characteristic group frequencies and are more specific in the total identification of a given, sample.

Hydroxyl-stretching bands ‘A’ and ‘Z’ in Raman and infrared spectra of kaolinites

Clay Minerals ◽  
1999 ◽  
Vol 34 (4) ◽  
pp. 551-563 ◽  
Author(s):  
S. Shoval ◽  
S. Yariv ◽  
K. H. Michaelian ◽  
M. Boudeulle ◽  
G. Panczer
Keyword(s):  
Particle Size ◽  
Ir Spectra ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
High Frequency ◽  
Longitudinal Optic ◽  
Transverse Optic

AbstractThe high frequency OH-stretching band in micro-Raman spectra of kaolinites consistently exhibits two partly overlapping components with varying relative intensities. These bands, labelled A and Z, are located at ~3700–3690 and 3690–3680 cm-1, respectively. Band Z displays greater intensity in Raman spectra of highly crystallized kaolinites which have large coherent domains. Both components are also observed in the curve fitted infrared (IR) spectra of kaolinites; band Z is stronger in IR spectra of highly crystallized samples. Data for kaolinites with different particle size support the idea that bands A and Z are the longitudinal optic and transverse optic modes of the high frequency OH-stretching band.

Infrared Spectra-Structure Correlations for Monohalogenated Monocarboxylic Acids

1971 ◽  
Vol 25 (2) ◽  
pp. 229-232 ◽  
Author(s):  
J. E. Katon ◽  
Thomas P. Carll ◽  
F. F. Bentley
Keyword(s):  
Ir Spectra ◽  
Infrared Spectra ◽  
Monocarboxylic Acids ◽  
Structure Correlations ◽  
Consistent Group ◽  
Halogenated Acids ◽  
The One

The ir spectra of 16 monohalogenated monocarboxylic acids have been recorded over the range 4000–200 cm−1. Attempts have been made to find useful spectra structure correlations which would serve to distinguish these acids from their unsubstituted analogs. It is concluded that differentiation of halogenated acids, either from unsubstituted acids or from each other, is not possible on the basis of consistent group frequencies, which forces one to resort to reference spectra for identification of these compounds. The one exception is provided by the alpha chloro-substituted compounds, which can, tentatively, be differentiated from both unsubstituted acids and other halogen-substituted acids. In contrast to previous reports, alpha halogen-substituted acids cannot be differentiated from the others unless the halogen is chlorine.

ChemInform Abstract: ClF2: Structure and Infrared Spectra of a Weakly Bound Triatomic Molecule.

ChemInform ◽  
2010 ◽  
Vol 24 (36) ◽  
pp. no-no
Author(s):  
J. M. GALBRAITH ◽  
G. VACEK ◽  
H. F. III SCHAEFER
Keyword(s):  
Infrared Spectra ◽  
Triatomic Molecule ◽  
Weakly Bound

Tablet Disintegrant Derived from Crosslinked Methacrylic Acid and Divinylbenzene Copolymers

2014 ◽  
Vol 1060 ◽  
pp. 168-171
Author(s):  
Siraprapa Chansatidkosol ◽  
Praneet Opanasopit ◽  
Prasert Akkaramongkolporn
Keyword(s):  
Free Radical ◽  
Ir Spectra ◽  
Infrared Spectra ◽  
Microcrystalline Cellulose ◽  
Methacrylic Acid ◽  
Placebo Tablet ◽  
Swelling Capacity ◽  
Methacrylic Acid Copolymers ◽  
Copolymer Structure ◽  
Mesh Sieve

Methacrylic acid copolymers crosslinked with 0.25-16 % divinylbenzene were synthesized by free radical polymerization using benzoyl peroxide as an initiator. The products were washed, dried and passed through a 80-mesh sieve prior to determining their infrared spectra, swelling capacity in water and disintegrant efficacy for microcrystalline cellulose (MCC) placebo tablet. The crosslinked methacrylic acid and divinylbenzene copolymers were successfully prepared as indicated by IR spectra, yielding around 50-80 %. The sieved particles of copolymers were white to faint yellow. In contact with water, they hydrated and swelled, where their swelling capacity was lowered with increasing the level of crosslink (divinylbenzene) in the copolymer structure. The copolymer with 0.25 % crosslink caused the MCC tablet to disintegrate fastest (1.2 min), corresponding to its highest swelling capacity. The disintegration efficacy increased with an increase in copolymer concentrations, but decreased with an increase in compression forces.

High Resolution Infrared Spectra of Some Naturally Occurring Sesquiterpene Hydrocarbons. II. Second Series

1970 ◽  
Vol 53 (5) ◽  
pp. 949-963 ◽  
Author(s):  
John A Wenninger ◽  
Ronald L Yates
Keyword(s):  
High Resolution ◽  
Ir Spectra ◽  
Essential Oils ◽  
Infrared Spectra ◽  
Capillary Column ◽  
Naturally Occurring ◽  
Sesquiterpene Hydrocarbons

Abstract An additional 24 high resolution IR spectra of naturally occurring sesquiterpene hydrocarbons are presented. Compounds were isolated from essential oils and purified by GLC techniques. The purity of each compound was checked by capillary column GLC. Infrared spectra of the following compounds are included: aromadendrene, allo-aromadendrene, cis-α-bergamotene, trans-β-bergamotene, cisa-α-bisabolene, trans-α-bisabolene, “α2-bisabolene“, cis-γ-bisabolene, β-cadinene, β1-cadinene, α-calacorene, chamazulene, β-chamigrene, “cubenene“, α-himachalene, β-himachalene, longicyclene, longifolene, α-muurolene, γ-muurolene, γ-patchoulene, epi-β-santalene, selina-4,ll-diene, and ylangene.

Cluster-model DFT simulations of the infrared spectra of triazine-based molecular crystals

2018 ◽  
Vol 20 (32) ◽  
pp. 20779-20784 ◽  
Author(s):  
Xiaohong Yuan ◽  
Kun Luo ◽  
Nan Liu ◽  
Xueqiang Ji ◽  
Chao Liu ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Ir Spectra ◽  
Infrared Spectra ◽  
Cluster Model ◽  
Molecular Crystals ◽  
Dft Simulations ◽  
Independent Molecules ◽  
Model Approach

A cluster-model approach is developed to simulate the IR spectra of triazine-based molecular crystals, and the distinct hydrogen-bonding environments of the crystallographically independent molecules can be clearly revealed.

scholarly journals Complete ligand loss in electron ionization of the weakly bound organometallic tungsten hexacarbonyl dimer

2016 ◽  
Vol 18 (15) ◽  
pp. 9893-9896 ◽  
Author(s):  
Michael Neustetter ◽  
Andreas Mauracher ◽  
Paulo Limão-Vieira ◽  
Stephan Denifl
Keyword(s):  
Valence Bond ◽  
Electron Ionization ◽  
Intermolecular Bond ◽  
Weakly Bound ◽  
Tungsten Hexacarbonyl

Electron ionization of the weakly bound tungsten hexacarbonyl dimer leads to a transformation of the weak intermolecular bond into a strong valence bond.

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