Supramolecular structures of substituted alpha,alpha'-trehalose derivatives

Area of Science:

• Carbohydrate Chemistry
• Crystallography
• Supramolecular Chemistry

Background:

• Alpha,alpha-trehalose is a disaccharide with significant biological and chemical interest.
• Understanding the solid-state structures of its derivatives is crucial for predicting their properties and designing new materials.
• Previous studies have characterized several trehalose analogues, providing a basis for comparison.

Purpose of the Study:

• To determine the crystal structures of five novel substituted alpha,alpha-trehalose derivatives.
• To compare these structures with previously reported analogues.
• To analyze the intermolecular interactions, particularly hydrogen bonding, that govern crystal packing.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the molecular and crystal structures.
• Analysis of hydrogen bonding networks, including C-H...O, C-H...S, C-H...pi(arene), O-H...O, and N-H...O interactions.
• Comparison of structural features and hydrogen bonding motifs across the series of trehalose derivatives.

Main Results:

• The crystal structures of five substituted alpha,alpha-trehalose derivatives were elucidated.
• Diverse hydrogen bonding patterns were observed, including C-H...O=S, C-H...O, C-H...pi(arene), O-H...O, and N-H...O interactions.
• These interactions lead to the formation of various supramolecular architectures, such as sheets and three-dimensional frameworks.

Conclusions:

• The study successfully characterized the solid-state structures of novel trehalose derivatives.
• Intermolecular hydrogen bonding plays a critical role in dictating the crystal packing and supramolecular assembly of these compounds.
• The findings contribute to a deeper understanding of structure-property relationships in carbohydrate derivatives.