Supramolecular structures from mono and dimetalated biscarbene ligands

Area of Science:

• Organometallic Chemistry
• Coordination Chemistry
• Materials Science

Background:

• Benzobisimidazole derivatives serve as versatile ligands in coordination chemistry.
• Carbene complexes, particularly those involving platinum and nickel, are crucial in catalysis and materials science.
• The development of novel multinuclear complexes and self-assembled structures is an active area of research.

Purpose of the Study:

• To synthesize novel benzobisimidazolium salts.
• To explore the reactivity of these salts with platinum and nickel precursors.
• To construct dinuclear biscarbene complexes and investigate their self-assembly into supramolecular architectures.

Main Methods:

• Tetraalkylation of benzobisimidazole to form benzobisimidazolium salts.
• Reaction of benzobisimidazolium salts with platinum and nickel precursors under specific conditions.
• Characterization of the resulting dinuclear complexes and molecular rectangles using spectroscopic and analytical techniques.

Main Results:

• Successful synthesis of four benzobisimidazolium salts (1a-d).
• Formation of dinuclear platinum biscarbene complexes (2a-d) and monometalated derivatives (3a,3c).
• Synthesis of a dinuclear nickel biscarbene complex (4) and its subsequent self-assembly into a molecular rectangle (5) with 4,4-bipyridine.

Conclusions:

• Benzobisimidazolium salts are effective precursors for synthesizing dinuclear platinum and nickel carbene complexes.
• The resulting complexes demonstrate potential for constructing well-defined supramolecular structures.
• This work expands the synthetic methodologies for creating advanced organometallic architectures.