Infrared studies of tautomerism in 2-hydroxypyridine 2-thiopyridine and 2-aminopyridine

Abdulla, Hussain I; Bermani, M. F. El

doi:10.1016/s1386-1425(01)00455-3

Cited by 56 publications

(47 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This frequency is comparable to that found in the vapor phase spectra of 2-aminopyridine [75] and matrix isolation spectra of thymine. [76] In dimer [1Á2], this feature disappears completely.…”

Section: Ir Measurementssupporting

confidence: 83%

Selective Formation of Bi‐Component Arrays Through H‐Bonding of Multivalent Molecular Modules

Piot

Palma

Llanes‐Pallas

et al. 2009

Adv Funct Materials

View full text Add to dashboard Cite

Here, the formation of discrete supramolecular mono- and bi-component architectures from novel and multivalent molecular modules bearing complementary recognition moieties that are prone to undergo multiple H-bonds, such as 2,6-di(acetylamino)pyridine and uracil residues, is described. These nanostructured H-bonded arrays, including dimeric and pentameric species, are thoroughly characterized in solution by NMR, in the solid state by FT-IR, and at the solid-liquid interface by means of scanning tunneling microscopy. The employed strategy is extremely versatile as it relies on the tuning of the valency, size, and geometry of the molecular modules; thus, it may be of interest for the bottom-up fabrication of nanostructured functional materials with sub-nanometer precision

show abstract

Section: Ir Measurementssupporting

confidence: 83%

Selective Formation of Bi‐Component Arrays Through H‐Bonding of Multivalent Molecular Modules

Piot

Palma

Llanes‐Pallas

et al. 2009

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…Some of these vibrations have been identified by Abdulla and El-Bermani, 18 and Jose and Mohan. 41 According to these authors, the stretching NH 2 modes lie in the region 3240-3455 cm 1 , the scissoring υ NH 2 at about 1637 cm 1 , the stretching C-NH 2 in the range 1320-1335 cm 1 , the out-of-plane NH 2 at about 620 cm 1 and the in-plane and out-of-plane bending modes of the C-NH 2 system in the range 390-430 cm 1 .…”

Section: Participate (N Atom and Hydrogen Atoms Move In Opposite Dirementioning

confidence: 90%

Crystal and molecular structure of 2‐aminopyridinium‐ 4‐hydroxybenzenosulfonate—IR and Raman spectra, DFT calculations and physicochemical properties

Lorenc

Bryndal

Marchewka

et al. 2008

J Raman Spectroscopy

View full text Add to dashboard Cite

A new organic-organic salt, 2-aminopyridinium-4-hydroxybenzenosulfonate, has been synthesised and characterised by means of FT-IR and FT-Raman spectroscopies, differential scanning calorimetry (DSC) and single crystal X-ray crystallography. Its vibrational spectra have been discussed on the basis of quantum chemical density functional theory (DFT) calculations using the B3LYP/6-31G(d,p) approach. The role of the intermolecular interactions in this crystal is analysed. The N-H· · ·O interactions between the hydrogen atoms of the pyridinium cation and oxygen atoms of hydroxybenzenosulfonate anion built the supramolecular arrangement in three-dimensional space.

show abstract

“…By taking into account results reported by Abdulla et al for 2-aminopyridines, [14] the formation of dimers could be considered to result form the absence of absorptions at 3500 cm -1 (Figure 7; Supporting Information, Figure S5). Unfortunately, the crystallization of X prevented further evidence from being obtained for this dimerization by X-ray diffraction on the SmC mesophase.…”

Section: Liquid Crystals Based On Compounds VIII Ix and Xmentioning

confidence: 99%

New H‐Bonded Complexes and Their Supramolecular Liquid‐Crystalline Organizations

et al. 2008

View full text Add to dashboard Cite

Different approaches to the design of liquid crystals by using H‐bonds were analyzed. A selection of stilbazoles and pyridine compounds, with one or two chelating positions, were used as H‐acceptors in mixtures with carboxylic acids. The noncovalent complexes in question afforded calamitic mesomorphism (N, SmA and SmC) as well as a lamellar mesophase (SmCP). Additionally, the liquid crystalline behaviour of the new 2‐hydroxy‐ and 2‐aminopyridine compounds as pure materials is also discussed. Useful results concerning the design and stability of noncovalent calamitic and bent‐core liquid crystals are reported. To induce the bent‐core liquid crystalline order, the conformational flexibility around the H‐bond must be controlled. The new liquid crystals were characterized by IR spectroscopy, optical microscopy, calorimetry, X‐ray diffraction and dielectric spectroscopy.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

show abstract

Infrared studies of tautomerism in 2-hydroxypyridine 2-thiopyridine and 2-aminopyridine

Cited by 56 publications

References 27 publications

Selective Formation of Bi‐Component Arrays Through H‐Bonding of Multivalent Molecular Modules

Selective Formation of Bi‐Component Arrays Through H‐Bonding of Multivalent Molecular Modules

Crystal and molecular structure of 2‐aminopyridinium‐ 4‐hydroxybenzenosulfonate—IR and Raman spectra, DFT calculations and physicochemical properties

New H‐Bonded Complexes and Their Supramolecular Liquid‐Crystalline Organizations

Contact Info

Product

Resources

About