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Molecular Models

Molecular Models

Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.

The Van der Waals Equation

The Van der Waals Equation

The ideal gas law is based on two simplifying assumptions: first, that there are no intermolecular attractions between gas molecules, and second, that the volume occupied by the molecules themselves is negligible compared with the volume of the container. However, these assumptions don't hold up under all conditions - specifically, at high pressures and low temperatures, as gas tends to deviate from ideal gas behavior.The van der Waals equation is an enhanced version of the ideal gas law,...

Van der Waals Equation

Van der Waals Equation

The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...

Van der Waals Interactions

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.Polar molecules have a partial positive charge on one end and a partial negative charge on the other end of the molecule,...

Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation

Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation

Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.

Newman Projections

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.

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Related Experiment Video

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Novel 3D/VR Interactive Environment for MD Simulations, Visualization and Analysis

Novel 3D/VR Interactive Environment for MD Simulations, Visualization and Analysis

Published on: December 18, 2014

Van der waals surfaces in molecular modeling: implementation with real-time computer graphics.

P A Bash, N Pattabiraman, C Huang

Science (New York, N.Y.)

|December 23, 1983

Summary

This study introduces a new method for creating interactive molecular surfaces, improving visualization during molecular modeling. The system offers faster, clearer representations of complex molecules.

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Published on: December 25, 2021

Area of Science:

Computational chemistry
Molecular modeling
Computer graphics

Background:

Visualizing molecular structures is crucial for understanding chemical interactions.
Current methods for generating molecular surfaces can be computationally intensive and lack real-time interactivity.
Representing complex molecular surfaces, especially for large molecules, presents significant visualization challenges.

Purpose of the Study:

To develop a novel method for generating van der Waals molecular surfaces.
To enable real-time, interactive visualization of molecular surfaces with enhanced clarity.
To improve the efficiency and comprehensibility of molecular surface generation for computational chemistry applications.

Main Methods:

Implementation of a real-time interactive calligraphic color display system for molecular surfaces.
Development of algorithms that maintain surface representation during bond rotation and global transformations.
Introduction of an interior atom removal technique for simplifying large molecule surface visualization.

Main Results:

The developed method generates accurate van der Waals molecular surfaces with real-time interactivity.
Molecular surfaces are correctly represented during dynamic transformations like bond rotation.
The interior atom removal method effectively clarifies the visualization of large molecules.
Both surface generation and atom removal algorithms demonstrate improved speed over existing methods.

Conclusions:

The combination of interactive display and efficient algorithms provides a powerful tool for molecular modeling.
This approach enhances the ability to comprehend and manipulate complex molecular structures in real time.
The method offers significant advancements in the field of computational chemistry and molecular visualization.