Infrared Analysis of Crystalline Penicillins

Barnes, R. Bowling; Gore, R. C.; Williams, E.; Linsley, S. G.; Petersen, Elizabeth M.

doi:10.1021/ac60009a002

Cited by 52 publications

(19 citation statements)

References 1 publication

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“…Infra-red spectroscopy, which may be rendered quantitative by methods such as those of Barnes et al (1947) for mulls, Lyon et al (1959) and Fieldes et al (1972) for potassium bromide discs, is such a method. Synthetic mixtures of glass, feldspar, and quartz can be prepared and infra-red spectra obtained from mull or disc preparations.…”

Section: Nz Tournal Of Geology and Geophysics Vol 19mentioning

confidence: 99%

Identification and correlation of thinly bedded tephra: The Tirau and Mairoa Ashes

Hodder

Wilson

1976

New Zealand Journal of Geology and Geophysics

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The Tirau and Mairoa Ashes are two volcanic ashes named during early field surveys in the Waikato and King Country districts of the North Island of New Zealand. To examine the relationship between the two, samples from the type localities and at geographically intermediate sites were investigated using multicomponent methods (mineral assemblages, rhyolitic character), single component methods (chemical analysis and magnetic susceptibility of glass shards), and single particle methods (refractive index of glass shards).The Mairoa Ash is appreciably andesitic. The Tirau Ash, earlier considered rhyolitic, is shown to have a significant andesitic component, particularly lower in the profile. These features, although apparent with the multi component methods, are made more obvious by the single component methods, which more closely represent compositional relationships at the time of eruption. The value of single particle methods is demomtrated by the recognition of two rhyolitic glasses in the Mairoa Ash from studies of the refractive index of the glass shards.

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Section: Nz Tournal Of Geology and Geophysics Vol 19mentioning

confidence: 99%

Identification and correlation of thinly bedded tephra: The Tirau and Mairoa Ashes

Hodder

Wilson

1976

New Zealand Journal of Geology and Geophysics

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“…Correlations between the spectra and structural properties of paraffins, olefins, and aromatics are tabulated and charted in a manner convenient to the needs of the practicing spectroscopist. They should improve the reliability of structural analyses of hydrocarbons because (1) wave-length ranges for the correlation A CORRELATION band is any band which empirical observation has demonstrated to be associated with a specific atom grouping (hereafter termed "structure"). Its presence in the spectrum of a material indicates that the structure may be present; its absence is certain evidence that the structure is missing.…”

mentioning

confidence: 99%

Infrared Spectra of Steroids

Tarpley¹,

Vitiello²

1952

Anal. Chem.

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In studies of the infrared spectra of certain highly purified steroids from 2 to 15 microns (5000 to 666 cm."1), difficulty is frequently encountered in obtaining spectra suitable for comparison purposes. These steroids are often only slightly soluble in the usual nonpolar solvents. Two approaches have resulted in some success in overcoming this difficulty; 0.2% solutions of A6-pregnene-3(/3)-ol-20-one in carbon disulfide yielded suitable fingerprint region spectra in a cell of long path length (8.5 mm.). Stabilized polar liquids with heavy atoms in their molecular structure were investigated in an effort to find solvents that would produce little or no interference in AMONG the difficulties in the infrared spectrometry of solids _T\. may be included the problems of preparing sufficiently thin films (9), loss of energy from the beam through scattering by crystalline samples (2, 4, H, 19, 22), and spectral variations due to partial sample orientation and possible polymorphism (1). Although mulling with mineral oil or perfluorokerosene has been used to reduce scattering losses, it has been the experience of this

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“…Upon deuteration of the N-H bond occurring in 2 the coupling between CN stretching and CND bending is lost: the amide II (A2) band around 1500 cm −1 downshifts. Assignment of Penicillin IR bands is obtained by comparing the experimental FTIR spectrum with previous spectra [26] and with the spectrum obtained from ab-initio calculations. The comparisons between experimental and calculated spectra in 2 and are reported, respectively in Figures 2 and 3.…”

Section: Ft-ir Spectramentioning

confidence: 99%

Linear and Non-Linear Middle Infrared Spectra of Penicillin G in the CO Stretching Mode Region

Ragnoni¹,

Catalini²,

Becucci

et al. 2021

Symmetry

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In this work we report the linear and non-linear IR spectral response characterization of the CO bonds of PenicillinG sodium salt in D2O and in DMSO−d6 solutions. In order to better characterize the spectral IR features in the CO stretching region, broadband middle infrared pump-probe spectra are recorded. The role of hydrogen bonds in determining the inhomogeneous broadening and in tuning anharmonicity of the different types of oscillators is exploited. Narrow band pump experiments, at the three central frequencies of β−lactam, amide and carboxylate CO stretching modes, identify the couplings between the different types of CO oscillators opening the possibility to gather structural dynamic information. Our results show that the strongest coupling is between the β−lactam and the carboxylate CO vibrational modes.

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Infrared Analysis of Crystalline Penicillins

Cited by 52 publications

References 1 publication

Identification and correlation of thinly bedded tephra: The Tirau and Mairoa Ashes

Identification and correlation of thinly bedded tephra: The Tirau and Mairoa Ashes

Infrared Spectra of Steroids

Linear and Non-Linear Middle Infrared Spectra of Penicillin G in the CO Stretching Mode Region

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