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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Characterization of slow conformational dynamics in solids: dipolar CODEX.

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A new solid-state NMR method uses dipolar couplings to study slow molecular motion in solids. This technique precisely measures conformational exchange and molecular dynamics in complex systems like crystalline urea.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Materials science
  • Chemical physics

Background:

  • Conformational exchange in solid-state systems is challenging to study.
  • Existing methods like Centerband-Only Detection of Exchange (CODEX) have limitations.
  • Dipolar couplings offer a promising alternative due to their structural and motional sensitivity.

Purpose of the Study:

  • To introduce a novel solid-state NMR experiment for probing slow conformational exchange.
  • To leverage the advantages of dipolar couplings for studying molecular motion.
  • To determine the correlation time of urea molecules within a crystalline lattice.

Main Methods:

  • Development of a new solid-state NMR experiment based on dephasing and refocusing of dipolar couplings.
  • Application of selective isotopic enrichment (Carbon-13, Nitrogen-15) for targeted analysis.
  • Utilizing the known a priori values of dipolar couplings from molecular structures.

Main Results:

  • The experiment successfully probed slow conformational exchange.
  • The correlation time for the motion of enriched urea molecules in a crystalline lattice was determined.
  • The method demonstrated the utility of dipolar couplings for studying molecular dynamics.

Conclusions:

  • The introduced solid-state NMR experiment is effective for studying slow conformational exchange.
  • Dipolar couplings provide a robust and geometrically relevant probe for molecular motion in solids.
  • This technique offers a valuable tool for investigating dynamics in complex biopolymers and crystalline materials.