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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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Equation of Rotational Dynamics01:08

Equation of Rotational Dynamics

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Angular variables are introduced in rotational dynamics. Comparing the definitions of angular variables with the definitions of linear kinematic variables, it is seen that there is a mapping of the linear variables to the rotational ones. Linear displacement, velocity, and acceleration have their equivalents in rotational motion, which are angular displacement, angular velocity, and angular acceleration. Similar to the rotational variables, a mapping exists from Newton's second law of motion...
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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Directing Effect of Substituents: meta-Directing Groups

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Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...
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Oxidation of Alcohols02:37

Oxidation of Alcohols

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In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
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Substituent-Controlled Quantum Dynamics in 2-Butynyl Alcohol-Water Dimer: Insights from Rotational Spectroscopy.

Yue Jiang1, Mei Hong2, Junhong Li1

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Quantum tunneling in 2-butynyl alcohol-water complexes was studied. Methyl substitution impacts water and hydroxyl group tunneling, revealing substituent control over quantum hydrogen dynamics in hydrogen-bonded systems.

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Area of Science:

  • Physical Chemistry
  • Molecular Spectroscopy
  • Quantum Dynamics

Background:

  • Hydrogen bonding plays a crucial role in molecular interactions.
  • Quantum tunneling influences dynamics in weakly bound systems.
  • Substituent effects can modulate molecular behavior.

Purpose of the Study:

  • To investigate the tunneling dynamics in the 2-butynyl alcohol-H2O complex.
  • To understand the influence of methyl substitution on these dynamics.
  • To elucidate the role of hydrogen bonds in controlling quantum phenomena.

Main Methods:

  • Pulsed-jet Fourier transform microwave spectroscopy.
  • Complementary quantum chemical calculations.
  • Analysis of tunneling-induced splittings in rotational spectra.

Main Results:

  • Identified two large-amplitude motions: internal rotation of water and concerted tunneling of water/hydroxyl group.
  • Observed isomer stabilized by dual OH···Ow and Ow-H···πC≡C hydrogen bonds.
  • Methyl substitution strengthened Ow-H···πC≡C interaction, affecting tunneling pathways.

Conclusions:

  • Substituent effects control tunneling cooperativity in hydrogen-bonded systems.
  • Methyl substitution oppositely modulates water rotation and skeletal torsion.
  • Provides mechanistic insight into substituent-controlled quantum hydrogen dynamics.