Towards Magnetic Carbo-meric Molecular Materials

Area of Science:

• Organic Chemistry
• Computational Chemistry
• Materials Science

Background:

• π-conjugated molecules can exhibit diradical character, challenging closed-shell Lewis structure descriptions.
• Aromaticity in polyacenes necessitates unpaired electrons in their singlet biradical ground states.

Purpose of the Study:

• To investigate the stabilization of singlet biradicals using C2 units in carbo-meric architectures.
• To explore the potential of these structures for developing novel magnetic and spin properties.

Main Methods:

• Utilized UB3LYP Density Functional Theory (DFT) with broken-symmetry calculations.
• Performed spin decontaminations and geometry optimizations for singlet diradicals.

Main Results:

• C2 units effectively stabilize singlet biradicals via spin delocalization.
• Two C2 units demonstrate a stabilizing effect comparable to a 1,4 phenylene moiety.
• Findings generalized to rigid hydrocarbon structures, suggesting cooperativity and self spin polarization.

Conclusions:

• Carbo-meric architectures offer a pathway to engineer molecules with diradical character.
• The study proposes synthesis targets with significant magnetic/spin characteristics.