A cobalt co-crystal complex based on 5-(3-pyridyl)-1H-pyrazole-3-carboxylic acid: Synthesis, crystal structure and electrochemical property

A new cobalt(II)-based complex, namely {[Co(Hppc)(2)][Co-2(4, 4'-bipy)(H2O)(4)](SO4)(2)center dot 2H(2)O}(n) (1) where H(2)ppc=5-(3-pyridyl)-1H-pyrazole-3-carboxylic acid and 4, 4'-bipy=4, 4'-bipyridine, was synthesized by solvothermal method. The ligand H(2)ppc is constituted by a pyridine ring, pyrazole ring, and carboxyl group, which possesses rigidity and flexibility. Complex1 was structurally determined by single-crystal X-ray diffraction and displays that the complex crystallizes in the C2/c pace group, monoclinic system. Complex1 includes two crystallographic independent parts which are 2D layered [Co(Hppc)(2)] and 1D chain like [Co-2(4, 4'-bipy)(H2O)(4)](2-) forming a co-crystal structure with a {4(4)center dot 6(2)}{4}(2) topological network. Furthermore, complex1 exhibits good electrochemiluminescence (ECL) performance and supercapacitive performance.