Related Experiment Video
Updated: Jul 13, 2026
10:03
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Experimental and theoretical electron density study of estrone
Elizabeth A Zhurova1, Chérif F Matta, Nan Wu
1Department of Chemistry, University of Toledo, Toledo, Ohio 43606, USA.
Journal of the American Chemical Society
|July 6, 2006
Summary
Estrone
Area of Science:
- Crystallography
- Quantum Chemistry
- Molecular Modeling
Background:
- Estrone is a key estrogen steroid hormone.
- Understanding its electronic structure is crucial for its biological activity.
Purpose of the Study:
- To determine the electron density and electrostatic potential of estrone.
- To compare experimental findings with theoretical calculations.
- To investigate bonding and aromaticity in estrone.
Main Methods:
- X-ray diffraction analysis at 20 K.
- Multipole modeling for electron density and electrostatic potential (ESP) analysis.
- Density Functional Theory (DFT) calculations in solid and gas phases.
- Quantum Theory of Atoms in Molecules (AIM) analysis.
Main Results:
- Experimental and theoretical electron densities and ESPs were compared.
- A novel hydrogen-hydrogen bond in a steroid molecule was characterized.
- AIM delocalization indices correlated well with experimental electron density.
- Aromaticity, chemical bonding, and key distances for estrogenic activity were discussed.
Conclusions:
- The study provides a detailed electronic structure analysis of estrone.
- Experimental and theoretical methods complement each other for characterizing molecular properties.
- The findings contribute to understanding the structure-activity relationships of steroid hormones.
Related Concept Videos
00:54Electron Behavior
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.Electrons Orbit the NucleusElectrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus...
01:27π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
01:09Electron Behavior
Electrons are negatively charged subatomic particles attracted to and orbit around the positively-charged nucleus of an atom. They reside in spaces associated with energy levels called shells and are further organized into subshells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus have less energy,...
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the nucleus have less energy,...
01:19Thomson's e/m Experiment
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
01:23Theory of Strong Electrolytes
The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
01:19Crystal Density
The crystal lattice structure of a material allows us to determine how many molecules exist in its unit cell. With this information, alongside the unit-cell parameters - three distance parameters (a, b, c) and three angular parameters (α, β, γ).Density (ρ) = (Z × M) / (a × b × c × NA)where:Z is the number of formula units per unit cellM is the molar mass of the substancea, b, and c are the edge lengths of the unit cellNA is Avogadro’s numberFor a simple cubic lattice, atoms are located only at...