216. The characteristic infra-red frequencies of the carboxylic acid group

Flett, M. St. C.

doi:10.1039/jr9510000962

Cited by 104 publications

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“…1a. 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].…”

Section: Reference Materialsmentioning

confidence: 91%

“…The most intense at 1280 cm −1 corresponds to the C-O deformation from the -COOH group and the peak at 891 cm -1 is related to the C-H deformation out of plane of conjugated double bonds. [39,[41][42][43][44][45] The infrared spectrum corresponding to dehydroabietic acid (Fig. 1b) is similar to those of abietic acid although it shows some minor differences (Fig.…”

Section: Reference Materialsmentioning

confidence: 99%

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Ageing of resin from Pinus species assessed by infrared spectroscopy

et al. 2016

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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.

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Section: Reference Materialsmentioning

confidence: 91%

Section: Reference Materialsmentioning

confidence: 99%

Ageing of resin from Pinus species assessed by infrared spectroscopy

et al. 2016

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“…4) with those of freshly prepared and aged films shows that the structure in Fig. 2, except for the bands at 1015 and 975 cm -1 is due to components of the anodizing solution, principally acetic acid monomer (13) and dimer (14)(15)(16), incorporated into the freshly prepared film. For band identification purposes the infrared transmission spectra of the vanadium oxides, obtained from Alpha Inorganics Co., was further substantiated from x-ray diffraction data.…”

Section: Identification Of the Anodic Fil•--a Study Was Madementioning

confidence: 91%

Anodization of Vanadium in Acetic Acid Solutions

Keil¹,

Salomon²

1968

J. Electrochem. Soc.

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Uniform anodic vanadium tetroxide films of controlled thickness have been grown on vanadium in acetic acid-sodium tetraborate solutions containing small quantities of water. The film composition was established using Faraday's law and EPR and ATR spectroscopy. The anode reaction was found to be 100% efficient in the production of vanadium (IV)oxide. The lack of oxygen evolution was attributed to reduced water activity as a result of its interactions with the acetic acid. Information concerning the nature of the film was obtained.

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“…The IR spectrum of the ligand PPA shows two strong bands at 1619 cm Ϫ1 and 1640 cm Ϫ1 which are assigned to the stretching vibration of the carboxylic carbonyl group and ring carbonyl group, respectively. 8,9) The new bands at 1717-1737 cm Ϫ1 confirm that the metal ions coordinate with the hydroxy oxygen of the carboxylic 494 Eight new solid complexes of pipemidic acid (PPA) with trichlorizated rare earth metals LaCl 3 , CeCl 3 , PrCl 3 , NdCl 3 , SmCl 3 , TbCl 3 , DyCl 3 , and YCl 3 have been synthesized. The complexes were characterized by elemental analyses, IR, NMR, and molar conductance measurements.…”

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Synthesis, Characterization, and Antibacterial Activities of Some Rare Earth Metal Complexes of Pipemidic Acid

et al. 2003

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Eight new solid complexes of pipemidic acid (PPA) with trichlorizated rare earth metals LaCl(3), CeCl(3), PrCl(3), NdCl(3), SmCl(3), TbCl(3), DyCl(3), and YCl(3) have been synthesized. The complexes were characterized by elemental analyses, IR, NMR, and molar conductance measurements. The general formulas of the complexes are [M(PPA)(4)]Cl(3) (M=Ce(III), Pr(III), Nd(III), Sm(III), Tb(III), Dy(III), Y(III)), and [La(PPA)(4)Cl]Cl(2). At the same time, the antibacterial activities of PPA and four of its complexes were tested. The results show that PPA and its complexes all have inhibitory action against bacteria of Escherichia coli, Bacillus subtilis, Streptococcus pneumoniae, and Pseudomonas aeruginosa but not Staphylococcus aureus. We compared their antibacterial activities and found that the antibacterial activity of [La(PPA)(4)Cl]Cl(2) against S. pneumoniae is much stronger than that of PPA and the other complexes.

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216. The characteristic infra-red frequencies of the carboxylic acid group

Cited by 104 publications

References 0 publications

Ageing of resin from Pinus species assessed by infrared spectroscopy

Ageing of resin from Pinus species assessed by infrared spectroscopy

Anodization of Vanadium in Acetic Acid Solutions

Synthesis, Characterization, and Antibacterial Activities of Some Rare Earth Metal Complexes of Pipemidic Acid

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