First charge transfer complex with a furazano[3,4-b]pyrazine-based acceptor

Area of Science:

• Organic chemistry
• Materials science
• Supramolecular chemistry

Background:

• Stable charged radicals are rare in organic materials.
• Charge transfer complexes are of interest for their unique electronic properties.

Purpose of the Study:

• To synthesize and characterize the first charge transfer complex of a dimethylphenazine radical cation and a furazano[3,4-b]pyrazine-based radical anion.
• To investigate the influence of solvent on the solid-state structure of this complex.

Main Methods:

• Single-crystal X-ray diffraction (SC XRD)
• Powder X-ray diffraction (PXRD)
• SQUID magnetometry
• Computational methods

Main Results:

• The synthesis of a novel charge transfer complex between a dimethylphenazine radical cation and a furazano[3,4-b]pyrazine radical anion was achieved.
• SC XRD revealed distinct cation-anion stacking motifs: -C-A-C-A- in THF and -A-A-C-C- in CH2Cl2.
• PXRD, SQUID, and computational studies provided further characterization of the material's features.

Conclusions:

• The formation of stable charged radical complexes is feasible.
• Solvent plays a crucial role in determining the supramolecular assembly and solid-state structure of organic charge transfer complexes.
• This work opens avenues for designing organic materials with tunable solid-state structures.