Structural study on polymorphism of long-chain dicarboxylic acids using oblique transmission method for micro FT-IR spectrometers
| Autor: | Masao Suzuki, Masamichi Kobayashi, Fumitoshi Kaneko, Eiichi Ishikawa |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Protein Folding
Stereochemistry Biophysics Stacking Infrared spectroscopy Biophysical Phenomena Analytical Chemistry law.invention Eicosanoic Acids law Spectroscopy Fourier Transform Infrared Dicarboxylic Acids Fourier transform infrared spectroscopy Crystallization Spectroscopy Instrumentation chemistry.chemical_classification Polymorphism Genetic Chemistry Atomic and Molecular Physics and Optics Crystallography Dicarboxylic acid Polymorphism (materials science) Single crystal |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 60:9-18 |
| ISSN: | 1386-1425 |
| DOI: | 10.1016/s1386-1425(03)00181-1 |
| Popis: | Polymorphism and higher-order structures of even-number dicarboxylic acids from hexadecanedioic acid to eicosanedioic acid have been studied by micro-FTIR spectroscopy and microscopic observation. In order to obtain the three-dimensional structural information, the oblique transmission method was incorporated into a micro-FTIR spectrometer equipped with a couple of Cassegrain lenses. The IR spectra showed that the solid states of dicarboxylic acid bore a marked structural similarity to those of n-saturated fatty acids. It was found that a solution-grown single crystal of dicarboxylic acids was an aggregate of lamellae whose thickness exceeded by far their molecular length. The surfaces of lamellae were covered with hydrocarbon segments taking a hairpin structure, and the linkage of hydrogen-bonded dicarboxylic acids formed a folded chain structure. The result of oblique transmission measurements showed that the stacking mode of lamellae varied depending on crystallization conditions. |
| Databáze: | OpenAIRE |
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