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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

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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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Basicity of Heterocyclic Aromatic Amines

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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
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NMR Spectroscopy Of Amines01:19

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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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Multidimensional Large Amplitude Dynamics in the Pyridine-Water Complex.

Rebecca B Mackenzie1, Christopher T Dewberry2, Ryan D Cornelius3

  • 1Department of Chemistry, University of Minnesota , 207 Pleasant Street, SE, Minneapolis, Minnesota 55455, United States.

The Journal of Physical Chemistry. A
|January 6, 2017
PubMed
Summary
This summary is machine-generated.

Pyridine and water form hydrogen bonds, with water rocking between structures. Deuteration causes an unusual inverted isotope effect, highlighting pyridine

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Area of Science:

  • Physical Chemistry
  • Spectroscopy
  • Computational Chemistry

Background:

  • Aqueous pyridine is crucial for solar energy catalysis.
  • Understanding pyridine-water interactions is key to optimizing these processes.

Purpose of the Study:

  • To investigate the pyridine-water interaction using experimental and theoretical methods.
  • To characterize the hydrogen bonding and internal dynamics of the pyridine-water complex.

Main Methods:

  • Microwave spectroscopy was employed to study the pyridine-water complex.
  • Density functional theory (DFT) calculations were used to model the interactions and dynamics.
  • Analysis of rotational spectra identified tunneling states and energy separations (ΔE).

Main Results:

  • Water forms a hydrogen bond to pyridine's nitrogen, with specific oxygen orientation.
  • An in-plane rocking motion of water interconverts equivalent structures via tunneling.
  • An inverted isotope effect was observed upon deuteration (D2O), with ΔE values of 10404.45 MHz (H2O) and 13566.94 MHz (D2O).
  • Evidence for additional internal motion suggests complexity in large-amplitude motion treatments.

Conclusions:

  • The ortho-hydrogens of pyridine significantly influence intermolecular interactions with water.
  • The observed inverted isotope effect presents a unique challenge for theoretical modeling.
  • This study provides fundamental insights into the dynamics of a key catalytic system.