Theoretical Insights into the Structural Differences between Organic and Inorganic Amines/Ethers

Area of Science:

• Computational Chemistry
• Quantum Chemistry
• Molecular Modeling

Background:

• Organic amines and oxanes possess distinct geometrical features compared to their inorganic counterparts.
• Understanding these structural differences is crucial for predicting chemical properties and reactivity.

Purpose of the Study:

• To elucidate the electronic origins of contrasting geometries in organic and inorganic amines and oxanes.
• To investigate the role of attractive and repulsive interactions in determining molecular structures.

Main Methods:

• Density Functional Theory (DFT) calculations were employed.
• Natural Bond Orbital (NBO) analysis was utilized to examine electronic interactions.
• NBO deletion optimizations were performed to assess the impact of specific interactions.

Main Results:

• Hyperconjugative effects in organic compounds are counteracted by repulsive interactions involving lone pairs.
• In inorganic compounds, specific lone pair interactions (LP(X) → σ*(E-R)) overcome repulsions, influencing structure.
• Back-bonding effects (LP(X) → d(E)) play a minor role in the anomalous structures of inorganic amines and oxanes.

Conclusions:

• The interplay between attractive and repulsive electronic interactions dictates the unique geometries of organic and inorganic amines and oxanes.
• NBO analysis provides key insights into the electronic factors governing these structural variations.