Infrared spectra of pyridine sorbed on porous glass

1968 ◽  
Vol 46 (20) ◽  
pp. 3255-3261 ◽  
Author(s):  
M. J. D. Low ◽  
V. V. Subba Rao
Keyword(s):  
Hydrogen Bonding ◽  
Nitrogen Atom ◽  
Infrared Spectra ◽  
Porous Glass ◽  
Physical Adsorption ◽  
Hydrogen Atoms ◽  
Oh Groups ◽  
Pure Silica ◽  
Hydrogen Bonded

Infrared spectra were recorded of pyridine (PY) sorbed on highly dehydroxylated, deuterated, and fluoridated porous glass, as well as on pure silica and boria-impregnated silica. The hydrogen atoms of sorbed PY exchange with surface OD groups. Physical adsorption occurs by hydrogen bonding of PY to SiOH and B—OH groups via the PY nitrogen atom; there is some interaction of the ring π system with OH groups. Surface B:PY complexes form by coordination of PY to boron; the B:PY may be hydrogen bonded to B—OH groups. Some PY dissociates, and OH groups are generated.

Infrared spectra of the interactions of aniline and porous glass surfaces

1969 ◽  
Vol 47 (8) ◽  
pp. 1281-1287 ◽  
Author(s):  
M. J. D. Low ◽  
V. V. Subba Rao
Keyword(s):  
Nitrogen Atom ◽  
Aromatic Ring ◽  
Secondary Amine ◽  
Infrared Spectra ◽  
Porous Glass ◽  
Weak Interactions ◽  
Amine Group ◽  
Oh Groups ◽  
Glass Surfaces ◽  
Adsorption And Dissociation

Infrared spectra were recorded of aniline sorbed on highly dehydroxylated, deuterated, and on fluoridated porous glass as well as on pure and boria-impregnated silica. The results suggest that two types of weak interactions involving the surface SiOH and B—OH groups occurred; the nitrogen atom of the amine was hydrogen bonded to surface OH and there was an interaction between OH groups and the π system of the aromatic ring. Some aniline chemisorbed on surface boron via the nitrogen atom of the amine group. Some aniline chemisorbed dissociatively to form secondary amine structures bonded through the nitrogen to surface boron atoms and new B—OH groups formed. Surface boron impurity acted as an adsorption and dissociation center.

Hydrogen bonding and conformation in cis- and trans-2-alkoxy-3-hydroxytetrahydrofurans

1968 ◽  
Vol 46 (1) ◽  
pp. 21-24 ◽  
Author(s):  
W. W. Zajac Jr. ◽  
F. Sweet ◽  
R. K. Brown
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectra ◽  
Hydroxyl Absorption ◽  
Cis And Trans ◽  
In Cis ◽  
Infrared Data ◽  
Hydrogen Bonded

Infrared spectra show both free and hydrogen bonded hydroxyl absorption in several trans-2-alkoxy-3-hydroxytetrahydrofurans. The extent of non-bonded hydroxyl is greater than that of bonded hydroxyl. Suggestions are made of possible conformations which might account for the infrared data.

Infrared Spectra of Crystalline Acetic Acid, a Hydrogen-Bonded Polymer

1977 ◽  
Vol 31 (2) ◽  
pp. 110-115 ◽  
Author(s):  
P. F. Krause ◽  
J. E. Katon ◽  
J. M. Rogers ◽  
D. B. Phillips
Keyword(s):  
Hydrogen Bonding ◽  
Acetic Acid ◽  
Infrared Spectra ◽  
Group Analysis ◽  
Structural Models ◽  
Factor Group ◽  
Vibrational Modes ◽  
Cryogenic Temperatures ◽  
Polymeric Chains ◽  
Hydrogen Bonded

The polarized infrared spectra of crystalline acetic acid and two of its deuterated derivatives, CH3COOD and CD3COOD, have been recorded from 400 to 4000 cm−1 at cryogenic temperatures. The spectroscopic results have been interpreted on the basis of a factor group analysis based on two structural models: a crystallographic cell composed of four interacting monomer units some of whose vibrational modes are highly perturbed by hydrogen bonding and a unit cell composed of two noninteracting acetic acid chains. The results are discussed in terms of possible interactions between the hydrogen-bonded acetic acid polymeric chains.

Contrast effect of hydrogen bonding on the acceptor and donor OH groups of intramolecularly hydrogen-bonded OH pairs in diols

2005 ◽  
Vol 62 (1-3) ◽  
pp. 97-104 ◽  
Author(s):  
Reikichi Iwamoto ◽  
Toshihiko Matsuda ◽  
Hiroshi Kusanagi
Keyword(s):  
Hydrogen Bonding ◽  
Contrast Effect ◽  
Oh Groups ◽  
Hydrogen Bonded

Perturbation effects due to hydrogen bonding in physical adsorption studied by length-change and infra-red techniques

1958 ◽  
Vol 246 (1244) ◽  
pp. 32-51 ◽  
Keyword(s):  
Hydrogen Bonding ◽  
Physical Adsorption ◽  
Porous Silica ◽  
Length Change ◽  
Hydroxyl Groups ◽  
Adsorbed Molecules ◽  
Oh Groups ◽  
Adsorption Sites ◽  
Infra Red ◽  
Length Changes

Effects due to hydrogen bonding between physically adsorbed molecules and the hydroxyl groups present on the surface of porous silica glass have been studied. Three methods have been used. As well as the classical isotherms, length changes of the adsorbent have been measured using an interferometer, and infra-red absorption spectra have been obtained both of the surface OH groups and the adsorbed molecules. Contractions of the rigid adsorbent, found under certain conditions at low coverages, are shown to be directly related to the strengths and number of the hydrogen bonds formed between the OH groups and the adsorbed molecules. More than half the surface OH groups were replaced by OCH 3 groups by methylation. Experiments performed on the glass after this treatment showed that the contractions had almost completely disappeared. It has been shown that two types of adsorption sites exist, one being the OH groups and the other the silicon or oxygen atoms. With acetone and ammonia, it has been shown spectroscopically that the energy of adsorption is lower on the OH sites than on the others. Consequently, as the temperature is raised the distribution of the adsorbed molecules between the two sites changes. Thus the marked decrease in the contractions with increase of temperature reported previously (Folman & Yates 1958) is due to the weakening of the hydrogen bonding with increase in temperature and also to a decrease in the relative numbers of the adsorbed molecules which are hydrogen-bonded. On the basis of all the results, a model of the surface conditions is proposed, which may explain the occurrence of the contractions found when hydrogen bonding is operative.

The Influence of Pressure on the Infrared-Spectra of Hydrogen-Bonded Solids. VII. Deuterated Ammonium Salts

1988 ◽  
Vol 41 (12) ◽  
pp. 1935 ◽  
Author(s):  
SD Hamann
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectra ◽  
Ammonium Salts ◽  
Ammonium Ions ◽  
Hydrogen Bonded

The infrared stretching and bending frequencies of isotopically dilute +NHD3 ions in predominantly +ND4 salts have been measured at pressures up to 5 GPa at 25°C. For most of the 28 salts studied, the stretching bands move to higher frequencies with increasing pressure, these results suggesting the absence of any significant hydrogen bonding between the ammonium ions and the anions in the crystals.

H2O, HDO, and CH3OH Infrared Spectra and Correlation with Solvent Basicity and Hydrogen Bonding

1971 ◽  
Vol 49 (6) ◽  
pp. 837-856 ◽  
Author(s):  
D. N. Glew ◽  
N. S. Rath
Keyword(s):  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Infrared Spectra ◽  
Dibasic Acid ◽  
Tertiary Amines ◽  
Type Symmetry ◽  
Solvent Basicity ◽  
Organic Amines ◽  
Lower Frequencies ◽  
Hydrogen Bonded

A study has been made of the infrared O—H bands for CH3OH, DOH, and H2O in solution and of their correlation with hydrogen bonding and solvent basicity. Infrared bands for the three fundamentals and the first bending overtone of H2O and for the O—H stretching fundamentals of DOH and CH3OH have been measured between 30 and −40 °C in a solvent range extending from weakly interacting fluorocarbons to strongly hydrogen-bonding organic amines. The O—H stretching bands for the weakly acidic solutes CH3OH, DOH, and H2O are mostly Lorentzian in shape and move to lower frequencies with higher extinctions in the more basic solvents. Many correlations are found between the stretching frequencies and band areas, and between the frequencies and solvent basicity. Monofunctional CH3OH is found to be a stronger acid and forms stronger hydrogen-bonds with a given base than do the doubly bonded DOH and HOH which show equal dibasic acid strengths.The wide, overlapped, fundamental stretching bands for H2O strongly hydrogen-bonded to the tertiary amines and for ice have been partially resolved and unequivocally assigned, showing that there is no cross-over of the ν 3 and ν1 bands despite the strong hydrogen-bonding.At higher temperatures in solvents containing both hydrophobic and strongly basic groups water was found with the lower Cs type symmetry, in which unbonded O—H groups gave sharp bands in the 3680–3650 cm−1 region in addition to the wide hydrogen-bonded bands at lower frequencies.

178. Infrared spectra and hydrogen bonding in compounds containing X(:O).OH groups

1959 ◽  
pp. 868 ◽  
Author(s):  
John T. Braunholtz ◽  
G. E. Hall ◽  
Frederick G. Mann ◽  
N. Sheppard
Keyword(s):  
Hydrogen Bonding ◽  
Infrared Spectra ◽  
Oh Groups

Correlation of Mössbauer Quadrupole Splitting (ΔΕQ) and Infrared Cyanide Frequency Separation in Alkali Metal Ferricyanides

1975 ◽  
Vol 30 (1-2) ◽  
pp. 96-98 ◽  
Author(s):  
A. N. Garg
Keyword(s):  
Solid State ◽  
Alkali Metal ◽  
Quadrupole Splitting ◽  
Infrared Spectra ◽  
Room Temperature ◽  
Frequency Separation ◽  
Hydrogen Atoms ◽  
Stretching Vibrations ◽  
Hydrogen Bonded

Mössbauer and infrared spectra of the alkali metal ferricyanides M3I [Fe(CN)6] · nH2O, where MI = H, Li and Na were studied at room temperature. All the three compounds displayed a doublet with small quadrupole splitting (ΔΕQ). Infrared spectra of these compounds in solid state gave two frequencies for C=N stretching vibrations with their separation (Δv) in increasing order which was found to be linearly correlated with ΔE Q. A plausible explanation has been given in terms of the interaction of Li+ and Na+ cations with the CN- ligands of octahedrally symmetric ferricyanide anion [Fe(CN)6]3- similar to that of hydrogen atoms which are hydrogen bonded in H3Fe(CN)6.

Elucidating structure–property relationships in imidazolium-based halide ionic liquids: crystal structures and thermal behavior

2020 ◽  
Vol 235 (8-9) ◽  
pp. 365-374
Author(s):  
Kai Richter ◽  
Katharina V. Dorn ◽  
Volodymyr Smetana ◽  
Anja-Verena Mudring
Keyword(s):  
Hydrogen Bonding ◽  
Ionic Liquids ◽  
Thermal Behavior ◽  
Crystal Engineering ◽  
Ionic Interactions ◽  
Structure Property ◽  
Hydrogen Atoms ◽  
Imidazolium Chloride ◽  
Imidazolium Cation ◽  
Oh Groups

AbstractA set of imidazolium-based ionic liquids (ILs), 1-(2-hydroxyethyl)-3-methylimidazolium chloride (1), 1,3-bis-(2-hydroxyethyl)-imidazolium chloride (2), and 1-butyl-2,3,4,5-tetramethylimidazolium bromide (3), has been synthesized and their structural and thermal behavior studied. Organic halides are well-known IL formers with imidazolium halides being the most prominent ones. Functionalization of the imidazolium cation by enhancing its hydrogen bonding capacity, i.e. through introduction of –OH groups or by diminishing it, i.e. through substitution of the ring hydrogen atoms by methyl groups is expected to change the inter-ionic interactions. Consequently, the solid-state structures of 1–3 have been characterized with means of single X-ray diffraction to shed light on preferential inter-ionic interactions for obtaining valuable information on anti-crystal engineering, i.e. designing ion combinations that favor a low melting point and exhibit a low tendency for crystallization. The study reveals that endowing IL forming ions with an enhanced hydrogen bonding capacity leads to a depression in melting points and kinetically hinders crystallization. This study provides hints towards new design concepts for IL design, similar to the common strategy of employing conformationally flexible ions.

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