Is the Induction Energy Important for Modeling Organic Crystals?

Area of Science:

• Computational chemistry
• Solid-state chemistry
• Molecular modeling

Background:

• Estimating induction energy is crucial for accurate prediction of crystal lattice energies.
• Organic molecular crystals present challenges due to complex charge density polarization.

Purpose of the Study:

• To compare two distinct methods for approximating induction energy in organic crystals.
• To investigate the impact of various model parameters on induction energy estimation.
• To assess the significance of induction energy in discriminating between different crystal structures.

Main Methods:

• Utilizing a distributed atomic polarizability model with distributed multipole moments derived from ab initio monomer properties.
• Employing ab initio calculation of molecular charge density within a point-charge field.
• Applying and analyzing models on diverse crystal structures of challenging organic molecules.

Main Results:

• Both computational methods demonstrated good agreement, despite differing approximations.
• Investigated parameters include polarizability model rank, self-consistent iterations, and damping.
• Induction energy was shown to be a critical factor in differentiating lattice energies of structures with varied hydrogen-bonding motifs.

Conclusions:

• The two compared methods provide reliable estimates of induction energy in organic crystals.
• Induction energy plays a significant role in the stability and structural preferences of molecular crystals.
• Accurate induction energy calculations are vital for predicting crystal properties and polymorphism.