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Related Concept Videos

Hydrogen Bonds01:04

Hydrogen Bonds

12.7K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
12.7K
Hydrogen Bonds00:26

Hydrogen Bonds

129.4K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
129.4K
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

4.0K
Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
4.0K
Structure of Alkanes02:23

Structure of Alkanes

32.1K
The formation of carbon-carbon bonds leading to the creation of the carbon chain is the basis of organic chemistry. August Kekulé and Archibald Scott Couper independently developed this idea of carbon chain formation.
Hydrocarbons are the simplest organic compounds composed of carbons and hydrogens. Based on the bond order between carbons, the hydrocarbons are further classified into alkanes, alkenes, and alkynes. 
Alkanes are the simplest hydrocarbons with sp3 hybrid carbon atoms....
32.1K
Relative Stabilities of Alkenes01:59

Relative Stabilities of Alkenes

15.4K
The relative stability of alkenes can be determined by comparing their heats of hydrogenation. The lower heat of hydrogenation indicates the more stable alkene.  The three main factors determining the relative stability of alkenes are i) the number of substituents attached to the double-bond carbon atoms, ii) hyperconjugation, and iii) the stereochemistry of the double bond.
15.4K
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

24.3K
According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N–O and N=O bonds.
24.3K

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Related Experiment Video

Updated: Dec 27, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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Two-dimensional hydrogen hydrates: structure and stability.

Hong Zhong1, Liwen Li, Rui Ma

  • 1College of Science, China University of Petroleum, Qingdao, 266580, China.

Physical Chemistry Chemical Physics : PCCP
|February 28, 2020
PubMed
Summary

Two-dimensional hydrogen hydrates confined between hydrophobic sheets show enhanced stability, offering a novel approach for hydrogen storage applications. This research explores their structural properties and temperature-dependent stability.

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Last Updated: Dec 27, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Methane Hydrate Crystallization on Sessile Water Droplets
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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Computational Chemistry

Background:

  • Hydrogen hydrates are crystalline solids involving hydrogen molecules within water cages.
  • Investigating novel forms of hydrogen hydrates is crucial for advancing hydrogen storage technologies.
  • Two-dimensional materials offer unique properties due to their reduced dimensionality.

Purpose of the Study:

  • To investigate the structure and stability of predicted two-dimensional hydrogen hydrates.
  • To explore the influence of confinement and temperature on hydrate stability.
  • To assess the potential of these novel hydrates for hydrogen storage.

Main Methods:

  • Utilizing density functional theory (DFT) for structural and energetic calculations.
  • Simulating four distinct two-dimensional hydrogen hydrate crystal structures (BLHH-I, BLHH-II, BLHH-III, BLHH-IV).
  • Analyzing the stability of hydrates in both confined and free environments.

Main Results:

  • Confinement between parallel hydrophobic sheets significantly enhances the stability of occupied cages.
  • The predicted two-dimensional hydrogen hydrates exhibit stability comparable to or exceeding conventional hydrates.
  • Hydrate stability demonstrates an inverse relationship with increasing temperature.

Conclusions:

  • Two-dimensional hydrogen hydrates are significantly stabilized by confinement.
  • These materials present a promising new avenue for hydrogen storage research.
  • Temperature plays a critical role in the stability of two-dimensional hydrates.