Harnessing Biomolecule-Infused 2D Multi-layered Luminescent Zn(II) Coordination Polymer for Electrochemical Energy Storage

Selecting the right functional linkers and metal centers is crucial for creating multifunctional crystalline coordination polymers, which show promise in energy storage applications. Herein, a new two-dimensional Zn(II)-based CP, named <b>BPHCC-1</b>, has been synthesized using solvothermal methods with 2-amino terephthalic acid (2ATA) and the biomolecule purine as key building blocks. Purine, which is relatively unexplored in CP synthesis, plays a crucial role in the distinct properties of CPs. <b>BPHCC-1</b>, obtained as a stable crystalline solid, was characterized through various analytical techniques including Fourier transform infrared spectroscopy, field emission scanning electron microscope, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller analysis. The material's stability is attributed to extensive hydrogen bonding, π···π interactions, and coordination of the -NH₂ group with the Zn(II) center. BPHCC-1 exhibits bright blue luminescence at 435 nm with a photoluminescence quantum yield of 29% in an aqueous dispersion. Furthermore, it demonstrates significant electrochemical energy storage performance, with a specific capacitance of 84 F g^-1 at 3 A g^-1 and retaining 64% of its original capacitance after 500 cycles. This study introduces a facile approach to designing multifunctional CPs, showcasing <b>BPHCC-1</b>'s potential as a luminescent probe and pseudocapacitive supercapacitor. The findings highlight the versatility of <b>BPHCC-1</b>, suggesting broad opportunities for its use across diverse fields.