The infra-red absorption bands associated with the COOH and COOD groups in dimeric carboxylic acid—II

Bratož, Silva; Hadži, D.; Sheppard, N.

doi:10.1016/0371-1951(56)80031-3

Cited by 178 publications

(66 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The general appearance of the spectra is much more in accord with those reported by Hadzi and Sheppard (1953) and Bratoz et al (1956) for ordinary dimeric carboxylic acids than with those reported by Yoshida and Asai (1959) for pyridine carboxylic acids. The work of the former authors, therefore, was used as the primary basis for the band assignments presented here.…”

Section: Resultssupporting

confidence: 87%

Infrared Spectroscopy of Picloram Interactions with Al(III)-, Fe(III)-, and Cu(II)-Saturated and Hydrous Oxide-Coated Montmorillonite

Aochi¹

1981

Clays and clay miner.

View full text Add to dashboard Cite

Abstract--Thin clay films prepared from aqueous suspensions of the potassium or sodium salt of picloram (4-amino-3,5,6-trichloropicolinic acid) with AI-, Fe-, or Cu-saturated montmorillonite or with montmorillonite coated with hydrous oxides of AI, Fe, or Cu were examined in an air-dry condition by infrared (IR) techniques to elucidate possible modes of interaction between picloram and the mineral surfaces. Deuteration was used to confirm band assignments of picloram and its salts prior to interaction with montmorillonite. Picloram interactions with AI-and Fe-saturated montmorillonite and with montmorillonite coated with hydrous oxides of A1 and Fe were concentration dependent. At high picloram concentrations similarities with the IR spectrum of potassium picloram indicated that much of the picloram was present in the salt form. As the concentration of picloram was reduced below that equivalent to 1 meq/g clay, the IR spectrum indicated the presence of the monomeric acid on the mineral surface. The spectrum of picloram on montmorillonite with a coating of copper hydrous oxide was similar to that of a Cu-picloram complex indicating coordination type bonding. The spectrum of picloram with Cu-saturated montmorillonite did not correspond to any of the other spectra of picloram examined. The interaction of picloram with montmorillonite coated with a hydrous oxide coating of Cu and with Cu-saturated montmorillonite were independent of picloram concentration in the range 2.20-0.44 meq/g clay.

show abstract

Section: Resultssupporting

confidence: 87%

Infrared Spectroscopy of Picloram Interactions with Al(III)-, Fe(III)-, and Cu(II)-Saturated and Hydrous Oxide-Coated Montmorillonite

Aochi¹

1981

Clays and clay miner.

View full text Add to dashboard Cite

show abstract

“…The bands at 3200 cm -1 , 2648 and 2534 cm -1 correspond to the group -COOH; the former to free OH (not the main one) and the last two to bonded OH, the most common since in solid state the carboxylic groups tend to form dimers [39]. These last bands appear overlapped with overtones and combination bands of lower-frequency vibrations from the COOH group which also appears around 1550 [40]. The C-H stretching absorption bands nearby 2900 cm -1 also show a complex shape due to the presence of =CH, -CH3, -CH2 and -CH groups, where the -CH2 bands appear split due to the presence of conjugated C=C bonds [41].…”

Section: Reference Materialsmentioning

confidence: 96%

Ageing of resin from Pinus species assessed by infrared spectroscopy

et al. 2016

View full text Add to dashboard Cite

Resins obtained from Pinus genus species have been widely used in very different fields throughout history. As soon as they are secreted molecular changes start altering their chemical, mechanical and optical properties. The ageing processes are complex and chemical and structural changes associated to resin degradation are not yet fully known. Many questions still remain open, for instance changes happening in pimaranes, one of the two diterpenoid constituents of the resin.A systematic study of the ageing process of Pinus resins is done through of Fourier Transform Infrared Spectroscopy (FTIR) using chemical standards and complementing obtained results with Gas Chromatography coupled to Mass Spectrometry (GC/MS) analysis when necessary. Moreover, long-term degradation processes are also investigated through the analysis of a selection of dated historical resins. The study overcomes the limitations of GC/MS and brings new information about the reactions and interactions between molecules during Pinus resin ageing process, providing information about bonds affected and unaffected and can be used as specific markers of the degradation and of the resins themselves.

show abstract

“…[4] and [12], which imply that a two-dimensional polynomial fitting is required. In addition, the matrix element <vlp,lvl> will have a more complex form, with a large number of interaction terms.…”

Section: Energy and Dipole Moment Derivatives Are Reported Inmentioning

confidence: 99%

“…Anharmonicity plays an important role, with vl in many cases being accompanied by a number of overtones and combination tones of vibrations of lower frequency whose intensity is boosted by Fermi resonance with vl. Ammonium and amine salts (8-11) and carboxylic acid dimers (12) are wellknown examples of this. All available evidence from gas and solution spectra shows that H-bond formation increases the anharmonicity of the X-H stretching vibration and introduces 'Permanent address: Departamento de Quimica -ICEx, U.F.M.G., Pampulha, CP 702, Belo Horizonte -MG30.161, Brazil.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and electrical anharmonicities of the linear hydrogen cyanide H-bonded trimer

Almeida¹

1991

Can. J. Chem.

View full text Add to dashboard Cite

WAGNER B. DE ALMEIDA. Can. J . Chem. 69,2044Chem. 69, (1991. The anharmonicity of the hydrogen-bonded (N.. .H) and proton-donor (C-H) stretching modes of the linear (HCN)3 species are calculated at the SCF level with the 4-3 1G and 6-31G** basis sets. Third and fourth energy derivatives and second and third dipole moment derivatives, which are needed to calculate the anharmonic terms, were evaluated by means of the one-dimensional Chebyshev polynomial fitting to the calculated ab initio points. Frequencies and intensities of overtone bands are reported and the effect of geometry relaxation on the polynomial fitted derivatives as well as mechanical anharmonicity on the vibrational intensities discussed.

show abstract

The infra-red absorption bands associated with the COOH and COOD groups in dimeric carboxylic acid—II

Cited by 178 publications

References 20 publications

Infrared Spectroscopy of Picloram Interactions with Al(III)-, Fe(III)-, and Cu(II)-Saturated and Hydrous Oxide-Coated Montmorillonite

Infrared Spectroscopy of Picloram Interactions with Al(III)-, Fe(III)-, and Cu(II)-Saturated and Hydrous Oxide-Coated Montmorillonite

Ageing of resin from Pinus species assessed by infrared spectroscopy

Mechanical and electrical anharmonicities of the linear hydrogen cyanide H-bonded trimer

Contact Info

Product

Resources

About