Dynamic odd-even effect in n-alkane systems: a molecular dynamics study

Area of Science:

• Physical Chemistry
• Materials Science
• Computational Chemistry

Background:

• The odd-even effect describes the alternating properties of n-alkanes based on carbon number.
• Understanding this effect is crucial for predicting material behavior.

Purpose of the Study:

• To investigate the odd-even effect in n-alkanes using molecular dynamics simulations.
• To examine the influence of carbon content on melting point, density, and molecular dynamics.

Main Methods:

• Conducted molecular dynamics simulations for n-alkanes from propane (n=3) to octane (n=8).
• Analyzed melting point, density, conformational ordering, translational, and rotational motion.

Main Results:

• Observed odd-even alternation in melting point, density, and dynamics.
• Identified anomalous behavior in heptane (n=7) for most properties except conformational ordering.
• Confirmed odd-even behavior in rotational and translational dynamics below and above melting points.

Conclusions:

• The odd-even effect in n-alkanes is influenced by molecular shape and density variations.
• Molecular shape and density interplay is key to understanding the origins of the odd-even effect.