A Trinuclear Cobalt-Organic Framework: Solvatochromic Sensor towards CH2 Cl2 , and its Derivative as an Anode of Lithium-Ion Batteries with High Performance.

Here, a porous cobalt-organic framework with pillared layer structures, namely [Co3 OBA3 PTD(H2 O)2 ⋅ 2 DMA⋅H2 O]n (1, H2 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 CH2 Cl2 within one minute and can be used 200 times at least. The corresponding dropper detector was assembled as a practical sensor. Meanwhile, the porous Co3 O4 was obtained by a simple but effective annealing treatment. Electrochemical measurements confirm that this Co3 O4 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.