A Cyclic Periodic Wave Function Approach for the Study of Infinitely Periodic Solid-State Systems. I. Application to...

Area of Science:

• Solid-state chemistry
• Computational chemistry
• Supramolecular chemistry

Background:

• Weak interactions like C-H···π bonds are crucial for stabilizing crystal structures.
• Accurate computational methods are needed to model these subtle interactions in periodic systems.

Purpose of the Study:

• To evaluate the cyclic periodic wave function (CPWF) approach for modeling C-H···π interactions in infinite solid-state systems.
• To assess the reliability of AM1 and PM3 semiempirical methods for these calculations.

Main Methods:

• Application of the cyclic periodic wave function (CPWF) approach.
• Utilizing AM1 and PM3 semiempirical approximations.
• Testing on dimer systems (ethyne, propyne) and crystal systems (pent-4-ynoic acid, tetrakis(4-ethynylphenyl)methane, tetraethynylmethane, tetrabutadiynylmethane).

Main Results:

• AM1 and PM3 methods accurately model C-H···π bonding in model dimer systems.
• The CPWF approach effectively studied various infinite crystal systems stabilized by C-H···π interactions.
• Results were consistent with available data, confirming the method's validity.

Conclusions:

• The CPWF approach at AM1 and PM3 levels is a convenient and reliable tool for studying weak C-H···π bonding in infinite periodic systems.
• This method facilitates the investigation of crystal structures stabilized by non-covalent interactions.