Interconnected trimeric, pentameric, and hexameric metallacycles in a singular silver-adenine framework

Area of Science:

• Coordination Chemistry
• Supramolecular Chemistry
• Crystallography

Background:

• Adenine derivatives are crucial in biological systems and coordination chemistry.
• Metal-templated self-assembly offers pathways to complex supramolecular architectures.

Purpose of the Study:

• To synthesize and characterize a novel silver complex with a modified adenine ligand.
• To investigate the coordination behavior and resulting supramolecular structures.

Main Methods:

• Synthesis of a silver complex with an N9-substituted adenine derivative.
• Single-crystal X-ray diffraction for crystallographic investigation.

Main Results:

• The adenine derivative coordinated to silver ions via all three ring nitrogens.
• Coordination also occurred at the nitrile pendant, forming a tetradentate ligand.
• Formation of interconnected silver-mediated trimeric, pentameric, and hexameric metallacyclic rings.
• Observation of helical structures along two orthogonal directions.

Conclusions:

• The modified adenine ligand effectively bridges silver ions, leading to diverse metallacyclic structures.
• The nitrile functionality plays a key role in the coordination network and structural complexity.
• This study highlights the potential of functionalized nucleobases in constructing intricate silver-based supramolecular assemblies.