Molecular Structure Determination
Molecular Structure Determination - Related Videos
07:29
Determination of Molecular Structures of HIV Envelope Glycoproteins using Cryo-Electron Tomography and Automated Sub-tomogram Averaging
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Cited by 16 •
2011
The protocol describes a high-throughput approach to determining structures of membrane proteins using cryo-electron tomography and 3D image processing. It covers the details of specimen preparation, data collection, data processing and interpretation, and concludes with the production of a representative target for the approach, the HIV-1 Envelope glycoprotein. These computational procedures are designed in a way that enables researchers and students to work remotely and contribute to data...
22:00
Crystallizing Membrane Proteins for Structure Determination using Lipidic Mesophases
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Cited by 48 •
2010
Herein is described the procedure implemented in the Caffrey Membrane Structural and Functional Biology Group to set up manually crystallization trials of membrane proteins in lipidic mesophases.
02:34
Molecular Structure and Acidity
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2025
An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors. The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
03:05
Acid Strength and Molecular Structure
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2020
Binary Acids and Bases In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...
01:29
Determination of Crystal Structures
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2026
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
FAQs
Nuclear magnetic resonance spectroscopy probes the magnetic environments experienced by nuclei in a molecule. Those environments provide constraints on how atoms are connected and arranged, giving evidence that can be compared with results from other techniques. In practice, NMR contributes structural information that helps chemists evaluate candidate molecular structures rather than relying on molecular mass alone.
Infrared spectroscopy is especially informative about bond vibrations, while mass spectrometry supplies molecular-mass information. These measurements address different structural questions: vibrational data help constrain functional groups, whereas mass data constrain molecular composition. Neither observation necessarily specifies the full arrangement by itself, so chemists interpret them alongside other structural evidence.
X-ray crystallography contributes information that the spectroscopic methods describe differently: diffraction patterns can constrain a molecule’s three-dimensional geometry and stereochemistry. This makes it particularly valuable when spatial arrangement matters, because connectivity alone does not fully express how atoms occupy three-dimensional space. Its results can therefore complement NMR, infrared, and mass spectrometric evidence.
Each method observes a different property: nuclear magnetic resonance addresses magnetic environments, infrared spectroscopy addresses bond vibrations, mass spectrometry addresses molecular mass, and X-ray crystallography addresses diffraction patterns. Combining these independent constraints narrows the set of structures consistent with the data and supports more complete conclusions about composition, connectivity, geometry, and stereochemistry.
Chemists can organize the evidence by asking which structural question each measurement addresses. Molecular-mass data constrain composition; bond-vibration data inform functional groups; magnetic-environment data constrain connectivity; and diffraction data address three-dimensional geometry and stereochemistry. Comparing these results produces a coherent structural assignment instead of treating any single measurement as sufficient.
Molecular Structure Determination supports compound identification, reaction analysis, materials development, pharmaceutical research, and studies of structure–function relationships. In each setting, the value lies in connecting measured structural features with chemical behavior or intended use. The approach is therefore relevant to identifying compounds, developing materials, investigating pharmaceutical systems, and examining how structure relates to function.