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

Abstract

On the basis of 3-(pyrazin-2-yl)-1H-Pyrazole-5-carboxylic acid (H2L) ligand, four new polymers [Cu2(L2–)2] (1), [Zn3(L2–)2(H2O)4Cl2]n (2), [Pb(HL–)Cl]n (3), {[Ni(L2−)(H2O)]•(H2O)}n (4) have been synthesized under solvothermal condition. Polymer 1 possesses a discrete...

Eu(III)-Functionalized MOF-Based Dual-Emission Ratiometric Sensor Integrated with Logic Gate Operation for Efficient Detection of Hippuric Acid in Urine and Serum

“…Weak interactions between the host framework and guest HA molecules were considered first for the nanocages in NiMOF , providing enough space and active sites to capture the guest HA molecules. Intermolecular interactions between the guest HA molecules and the framework enhanced not only the rigidity of the framework but also the coplanarity of the aromatic rings, which ultimately improved the luminescent intensity of the framework. − Moreover, the close host–guest weak interactions make the photoinduced electron transfer (PET) possible, which was considered to be the most important factor to illustrate the luminescence enhancement response of the two hybrid materials to HA . To verify this conjecture, density functional theory was employed to calculate the frontier orbital energy levels of NiMOF and analyte of HA. , Geometry optimizations of HA were carried out with the B3LYP function, and the time-dependent density functional theory (TD-DFT) calculations were performed on the optimized structure with a basis set of 6-311+G­(d,p) for C H N O.…”

Influence of reaction temperature and stoichiometry on the coordination mode of a multidentate pyridylpyrazole ligand in Co(ii) complexes: from a 0D mononuclear structure to 3D frameworks

“…56 A comparison of the maximum emission intensities of the complexes investigated with the reference complex RuIJbpy) 3 2+ resulted in the ECL yield of 0.10, 0.21 and 0.15 for 1-3, respectively, proving that the introduction of transition metals can strengthen the spin-orbit coupling effect and lead to a positive effect on the ECL intensity. 57,58 Based on these results, complexes 1-3 can open up a new direction for the design of novel coordination polymer ECL materials with excellent electrochemiluminescence properties at a low cost.…”