A Conductive 2D Conjugated Tetrathia[8]circulene‐Based Nickel Metal–Organic Framework for Energy Storage

Abstract

Herein, a novel D4 symmetrical redox‐active ligand tetrathia[8]circulene‐2,3,5,6,8,9,11,12‐octaol (8OH‐TTC) is designed and synthesized, which coordinates with Ni2+ ions to construct a 2D conductive metal‐organic framework (2D c‐MOF) named Ni‐TTC. Ni‐TTC exhibits typical semiconducting properties with electrical conductivity up to ≈1.0 S m−1 at 298 K. Furthermore, magnetism measurements show the paramagnetic property of Ni‐TTC with strong antiferromagnetic coupling due to the presence of semiquinone ligand radicals and Ni2+ sites. In virtue of its decent electrical conductivity and good redox activity, the gravimetric capacitance of Ni‐TTC is up to 249 F g−1 at a discharge rate of 0.2 A g−1, which demonstrates the potential of tetrathia[8]circulene‐based redox‐active 2D c‐MOFs in energy storage applications.

Topologically Tunable Conjugated Metal–Organic Frameworks for Modulating Conductivity and Chemiresistive Properties for NH3 Sensing

“…Thiophene, a five-membered aromatic ring similar to benzene, possesses a distinctive cyclic structure that imparts it with high electron density and strong conjugation effects. [44,45] Thiophene and its derivatives have found applications in pharmaceuticals, [46] materials science, [47] and organic optoelectronic devices. [48] By introducing thiophene units into cMOFs, exciting electrical performance can be achieved.…”

2D Conductive Metal–Organic Frameworks for Electrochemical Energy Application

“…[1][2][3][4][5] By virtue of their unique hybrid structures combining inorganic and organic components, MOFs exhibit exceptional properties including high porosity, large specific surface areas (SSAs), abundant active sites, and tunable structures. Consequently, extensive applications in diverse fields such as gas storage and separation, [6][7][8][9] sensing, [10][11][12][13][14][15] catalysis, [16][17][18][19][20] spintronics, [21][22][23][24][25] batteries, [26][27][28][29][30] capacitors, [31][32][33][34] among others were explored. However, conventional MOFs typically suffer from low intrinsic conductivity (δ < 10 −10 S • cm −1 ), rendering them electrical insulators and limiting their potential in electrochemical applications.…”