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Showing 1 to 20 of 139 for “"Infrared spectra"”.
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Infrared spectra of adsorbed molecules
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1960.
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Isotopic labelling applied to the infrared spectra of metal complexes
The infrared spectra of pyridine adducts of first transition series metal(II) acetylacetonates are discussed in relation to the band shifts induced by ¹⁵N-labelling and deuteration of the pyridine ring and by metal ion substitution. ¹⁵N-Labelling aids in establishing the pyridine ring vibrations, …
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Isotopic labelling applied to the infrared spectra of metal complexes
… thiocyanates is reported. Comparisons with the spectra of related complexes of 2,2'-bipyridine and ethylenediamine together with metal-ion substitution, deuteration and ¹⁵N isotopic labelling of the amino group in 2-aminomethylpyridine enable reliable band assignments to be made. The study shows …
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Isotopic labelling applied to the infrared spectra of metal complexes
… by their lack of deutero-sensitivity. The infrared spectra of imidazole and its complexes are examined in order to determine the ratio vD/ vH for bands as signed to the C-H, N-H and ring modes of the heterocyclic ring. With very few exceptions, vD/vH falls within the ranges 0. 74 to 0. 84 …
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Infrared-Spectra of Soil Humic and Fulvic Acids and Their Derivatives
Made available in DSpace on 2014-12-10T17:12:45Z (GMT). No. of bitstreams: 1 7000855.pdf: 6627297 bytes, checksum: 59bd4924a493079126e469fb4f90acfc (MD5) Previous issue date: 1969
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Computational and Theoretical Modeling of Two Dimensional Infrared Spectra of Peptides and Proteins
Two-dimensional infrared (2D-IR) spectroscopy evolved out of the theoretical underpinnings of nonlinear methods to provide a means of investigating detailed molecular structure on ultrafast timescales. This opens up new possibilities for the study of protein folding and molecule-solvent …
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Infrared Spectra Analysis of Thermally Altered Iron Phyllosilicates and the Implications for Mars
… each sample was placed in a Fourier Transform Infrared (FT-IR) spectrometer to collect the near- and mid-infrared spectra. The spectra allowed for these terrestrial analogs to be analyzed with regards to how their structure breaks down with increasing temperature. The samples' colors were also …
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Application of crystal field theory to the infrared spectra of transition metal complexes
[pages missing] problem in the IR spectra of 8-quinolinol chelqtes of di~ and trivalent metals of the first transition series. The metal-sensitivity of bands in the IR spectra of structura~ly differing substituted 8-quinolinol Qhelates ~eceives an interpretation in terms of crystal field theory. …
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Isotopic labelling : application to band assignments in the infrared spectra of metal complexes
… to its application to band assignments in the infrared spectra of metal complexes. ¹⁵N- and ²H-labelling are applied to three classes of transition metal coordination compounds.
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Effect of halite and calcite coatings on thermal infrared spectra wih implications for Mars exploration
… for attaining this knowledge because the thermal infrared (TIR) remote sensing method for determining mineral abundance is limited to the top few hundred micrometers of the surface. To better understand the TIR properties of salt coatings, we investigated the effects of coating thickness and …
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Modeling the Fourier transform near infrared spectra of unreacted starch in corn for monitoring applications
… assay based on the Fourier transform near infrared spectra of starch blends and corn flour was developed to predict unreacted starch contents in corn. Results of the study showed unreacted starch content in corn increased during the first four weeks after harvest, then decreased until 10 to …
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A trajectory-based approach to modeling nonlinear infrared spectra : interrogating strong hydrogen bonds and proton transfer
… approach for modeling linear and nonlinear infrared spectroscopy of condensed phase chemical systems, focusing on applications to strongly hydrogen bonded complexes. To overcome the limitations inherent in common analytical models, I construct full time trajectories for spectroscopic …
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Methods for multi-spectral image fusion: identifying stable and repeatable information across the visible and infrared spectra
… methods that enable us to map and overlay multi-spectral information; the goal is to establish a combined image in which each pixel contains both colour and thermal information. Pixel-level fusion of these distinct modalities is approached using computational stereo methods; the focus is on the …
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Retrieval of methane and carbon monoxide using near infrared spectra recorded by SCIAMACHY onboard ENVISAT : Algorithm Development and data analysis
… of space-borne remote sensing, features near infrared spectrometers measuring sunlight reflected and scattered back from the earth’s surface and atmosphere. In contrast to thermal emission sounders, the near infrared spectrometers enable the global retrieval of methane, carbon dioxide and …
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The effects of metal ion and ligand substitution on the spectroscopic properties of metal complexes.
… metal ions. Bands in the ultraviolet electronic spectra of Cu(II) β-ketoenolate complexes are more conclusively assigned by comparison of the spectra of the β-ketoenolates, their sodium salts and the copper complexes. The effect of ligand substitution on the infrared spectra of Cu(II) …
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Charge Transfer Reactions in Porous Materials
… methods is discussed in Chapter 2. In Chapter 3, infrared spectra of a model proton-transfer complex calculated using mixed quantum-classical molecular dynamics are calculated. These studies indicate that charge transfer dynamics and equilibria are spatially-dependent in nanoconfined systems. This …
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An investigation of the nickel (II) and cobalt (II) complexes employing pentadentate ligands derived from salicylaldehyde and bis (3,3'- aminopropyl) ether or sulfide
… been characterized by elemental analysis, mass spectra, infrared spectra, magnetic susceptibility measurements, and ultraviolet-visible-near infrared spectra. In the solid state the nickel(II) complexes, Ni(X-SALDAPE) and Ni(X-SALDAPS), where X = H, 5-Br, 3-(CH₃)₂CH, or 3-CH₃O, are speculated as …
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The synthesis of 10-(4-hydroxymethylphenyl)-1,2-Benzanthracene
… or the alcohol was proven by: (1) Ultraviolet spectra (2) Infrared spectra (3) Elementary analysis (4) Preparation or the benzoate B. The preparation of the Grignard reagent of 10-(4’-bromophenyl)-1,2-benzanthracene was unsuccessful. An explanation of this anomaly was not discovered. C. The …
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A Novel Acetaminophen Soft-Chew Formulation Produced Via Hot Melt Extrusion With Inline Near-Infrared Monitoring As A Process Analytical Technology Tool
… 7 were 90 ëšc and 140 ëšc, respectively. Near-infrared spectra were collected during extrusion to monitor the quality consistency. Scanning electronic microscopy images of tablets' cross-section were taken by Joel model sem. Differential scanning calorimetry was used to characterize the crystal …
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