Click Chemistry: A Promising Tool for Building Hierarchical Structures

Area of Science:

• Materials Science
• Chemistry
• Nanotechnology

Background:

• Hierarchical structures in nature exhibit diverse mechanical, physical, and biological properties.
• Existing reviews on click chemistry for hierarchical structures are often narrowly focused on specific reactions, molecules, or dimensional ranges.
• A comprehensive framework is needed to connect disparate research in this field.

Purpose of the Study:

• To provide a unifying framework for understanding click chemistry's role in building hierarchical structures across multiple length scales.
• To connect atomic theory (picoscopic), the nano-periodic system (nanoscopic), and micro/macrometer dimensions.
• To highlight the potential of click chemistry for creating complex, hierarchical materials.

Main Methods:

• Reviewing and synthesizing existing literature on click chemistry applications in hierarchical structure formation.
• Presenting two primary approaches: direct one-step formation and multi-step sequential assembly (Pico ➔ Nano ➔ Micro/Macro).
• Connecting different dimensional levels from molecules to macroscopic structures.

Main Results:

• Demonstrated click chemistry's versatility in constructing hierarchical structures from pico- to macrodimensions.
• Illustrated a one-step approach for direct 3D structure formation from molecular building blocks.
• Detailed a multi-step approach enabling sequential assembly from 0D to 3D nanostructures and beyond.

Conclusions:

• Click chemistry offers a powerful and versatile platform for designing and synthesizing hierarchical structures across all length scales.
• The presented framework bridges fundamental atomic/molecular concepts with advanced nano- and microscale material architectures.
• This approach facilitates the development of novel materials with tailored properties by controlling hierarchical organization.