Room-temperature ferromagnetism and photoluminescence in layer-conjugated 2D Cu-BDC

Abstract

Magnetic metal-organic frameworks (MOFs) hold immense promise as multifunctional materials for next-generation spintronic and optoelectronic devices. Here, we introduce a layered conjugated MOF 2D Cu-BDC, i.e., Cu(BDC)(DMF), synthesized via a simple solution co-deposition method at ambient conditions. Cu-BDC exhibits robust room-temperature ferromagnetism arising from strong coupling between Cu2+ ions and delocalized π-electrons in the ligand, as revealed by magnetic measurements and density functional theory calculations. Ferromagnetic resonance studies further demonstrate a low Gilbert damping factor of 8.4 × 10−3, highlighting its potential for efficient spin transport. In parallel, Cu-BDC MOFs show a high conductivity (σ) of 115.7 S cm−1 at room temperature and efficient photoluminescence (λex = 462 nm) induced by π*-π electron transitions in the temperature range of 100–300 K. This unique integration of magnetic, electronic, and optical properties positions Cu-BDC as a compelling candidate for multifunctional applications in advanced opto-spintronics.