Electrochemiluminescence properties and luminescence sensing of four novel polymers derived from 3-(pyrazin-2-yl)-1H-pyrazole-5-carboxylic acid

On the basis of the 3-(pyrazin-2-yl)-1H-pyrazole-5-carboxylic acid (H2L) ligand, four new polymers [Cu-2(L2-)(2)] (1), [Zn-3(L2-)(2)(H2O)(4)Cl-2](n) (2), [Pb(HL-)Cl](n) (3), and {[Ni(L2-)(H2O)]center dot(H2O)}(n) (4) have been synthesized under solvothermal conditions. Polymer 1 possesses a discrete (0D) binuclear structure, which is further formed into a three-dimensional (3D) supramolecular structure by hydrogen bonding and pi MIDLINE HORIZONTAL ELLIPSIS pi stacking interactions. Polymers 2 and 3 display one-dimensional (1D) infinite chain structures, which further extend into 3D supramolecular structures through hydrogen bonding interactions. Polymer 4 features two-dimensional (2D) layers which can form a 3D supramolecular architecture via interlayer hydrogen bonds. The ligand in the four polymers adopts different coordination modes for constructing versatile structures. Moreover, luminescence sensing study shows that polymer 2 is a promising luminescent sensor for the detection of Cu2+, Co2+ and Fe(3+)via drastic luminescence quenching in aqueous solution with high efficiency. The quenching constants K-SV for Cu2+, Co2+ and Fe3+ are 6.35 x 10(3) M-1, 8.70 x 10(3) M-1 and 1.62 x 10(4) M-1, respectively. What's more, 1-4 with electrochemical luminescence (ECL) properties show high intensity in N,N-dimethylformamide (DMF) solution and high thermal stability.