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Related Concept Videos

Continuous Charge Distributions01:17

Continuous Charge Distributions

Imagine a bucket of water. It contains many molecules, of the order of 1026 molecules. Thus, although it contains discrete elements (molecules) at the microscopic level, macroscopically, it can be considered continuous. Small volume elements of water, infinitesimal compared to the bulk of the bucket's volume, still contain many molecules. Under this framework, quantized matter is approximated as continuous for practical purposes.
The electric charge can also be subjected to an analogical...
Formal Charges02:42

Formal Charges

In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists.
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Lewis Structures and Formal Charges02:19

Lewis Structures and Formal Charges

Lewis symbols can be used to indicate the formation of covalent bonds, which are shown in Lewis structures—drawings that describe the bonding in molecules and polyatomic ions. The periodic table can be used to predict the number of valence electrons in an atom and the number of bonds that will be formed to reach an octet. Group 18 elements, such as argon and helium, have filled electron configurations and thus rarely participate in chemical bonding. However, atoms from group 17, such as bromine...
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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.
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
08:54

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

Meaningful structural descriptors from charge density.

Dietmar Stalke1

  • 1Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany. dstalke@chemie.uni-goettingen.de

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 1, 2011
PubMed
Summary

Electron density investigations offer insights into chemical properties and bonding. Charge density analysis helps clarify chemical concepts and can inspire new synthetic strategies.

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Area of Science:

  • Chemistry
  • Quantum Chemistry
  • Materials Science

Background:

  • Electron density investigations are crucial for understanding chemical phenomena.
  • Modeling and interpreting electron density distributions are key challenges.
  • Connecting numerical data to chemical concepts requires careful consideration.

Purpose of the Study:

  • To introduce the fundamentals of electron density investigations.
  • To explain two primary methods for modeling electron density.
  • To demonstrate the application of charge density studies in main group compounds.

Main Methods:

  • Presentation of two predominant approaches for electron density modeling.
  • Interpretation of electron density distributions.
  • Deduction of chemical properties from charge density data.

Main Results:

  • Charge density analyses provide insights into chemical bonding and reactivity.
  • The relationship between numerical data and chemical concepts can be complex.
  • Heuristic connections are often used, but rigorous definitions are preferred.

Conclusions:

  • Charge density studies can illuminate the bonding situation in compounds.
  • These analyses can help identify misconceptions in chemical understanding.
  • The findings can pave the way for novel synthetic approaches.