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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Crystal Field Theory
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Direct chiroptical correlation of dissymmetric crystal morphologies.

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Researchers established a direct link between enantiomorphous metal-organic framework (MOF) crystals and molecular chirality. Chiroptical imaging confirmed optical activity, correlating morphology with molecular structure.

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Area of Science:

  • Crystallography
  • Materials Science
  • Physical Chemistry

Background:

  • Molecular dissymmetry in crystals, or chirality, has been studied since Pasteur.
  • Chirality links macroscopic crystal form to microscopic molecular structure.
  • Enantiomorphous tartrate salt crystals were historically used to demonstrate chirality.

Purpose of the Study:

  • To establish a direct correlation between enantiomorphous metal-organic framework (MOF) crystals and molecular chirality.
  • To investigate the relationship between crystal habit geometry and single-crystal optical activity.
  • To determine the heterochirality of mirror-image MOF forms when X-ray methods are insufficient.

Main Methods:

  • Single-crystal X-ray scattering was used to analyze crystal structure and space group.
  • Chiroptical imaging with a complete polarimetric microscope was employed.
  • Optical circular birefringence measurements were performed on MOF enantiomorphs.

Main Results:

  • A direct correlation was shown between enantiomorphous MOF crystals and molecular structure chirality.
  • Crystal habit geometry correlated with single-crystal optical activity in low-symmetry directions.
  • X-ray scattering suggested a hexagonal, enantiomorphous space group, but could not confirm heterochirality.

Conclusions:

  • Chiroptical imaging provides a method to correlate optical and morphological chirality in MOFs.
  • This technique overcomes limitations of X-ray crystallography for determining MOF enantiomorph heterochirality.
  • The study confirms the link between macroscopic crystal properties and molecular chirality in MOFs.