Fluorescence quenching study of 2,6-bis(5-(4-methylphenyl)-1-H-pyrazol-3-yl)pyridine with metal ions.
A novel bispyrazole derivative 2,6-bis(5-(4-methylphenyl)-1-H-pyrazol-3-yl)pyridine was synthesized and its structure was confirmed by (1)H NMR, FTIR, MS techniques and elemental analysis. The binding interactions of BMPP with Cd(2+), Co(2+), Pb(2+) and Cu(2+) ions were investigated in MeOH-H2O solution by fluorescence quenching technique at two temperatures (25 and 35°C). Their quenching constants KSV, binding constants K, binding sites n and thermodynamic parameters (ΔH, ΔG and ΔS) were determined. The results indicated that the metal ions quenched the intrinsic fluorescence of the bispyrazole by forming the bispyrazole-metal complexes and their quenching process was a static quenching mechanism. In addition, the process of interaction was spontaneous and mainly ΔS-driven.
['Liu|Hua|H|', 'Li|Fang-Xiong|FX|', 'Pi|Yan|Y|', 'Wang|Dun-Jia|DJ|', 'Hu|Yan-Jun|YJ|', 'Zheng|Jing|J|']
D001665:Binding Sites D007477:Ions D007700:Kinetics D008670:Metals D011720:Pyrazoles D011725:Pyridines D012044:Regression Analysis D013050:Spectrometry, Fluorescence D013816:Thermodynamics
Fluorescence quenching 2,6-Bis(5-(4-methylphenyl)-1-H-pyrazol-3-yl)pyridine Quenching constant Thermodynamic parameters