A Trinuclear Cobalt–Organic Framework: Solvatochromic Sensor towards CH₂Cl₂, and its Derivative as an Anode of Lithium‐Ion Batteries with High Performance

Abstract

Abstract Here, a porous cobalt–organic framework with pillared layer structures, namely [Co 3 OBA 3 PTD(H 2 O) 2 ⋅ 2 DMA ⋅ H 2 O] n ( 1 , H 2 OBA=4,4′‐oxybis(benzoic acid); PTD=6‐(pyridin‐4‐yl)‐1,3,5‐triazine‐2,4‐diamine), was fabricated by using cobalt trinuclear nodes, low‐cost carboxylic linker, and accessible nitrogen heterocyclic ligands. This compound exhibited a highly efficient solvatochromism towards CH 2 Cl 2 within one minute and can be used 200 times at least. The corresponding dropper detector was assembled as a practical sensor. Meanwhile, the porous Co 3 O 4 was obtained by a simple but effective annealing treatment. Electrochemical measurements confirm that this Co 3 O 4 material derived from compound 1 shows high and stable lithium storage capabilities (1081.75 mA h g −1 at 200 mA g −1 after 115 cycles) and excellent rate properties.