Complexation of Zn2+ with Vinyl Imidazole Containing IMAC Adsorbent: Potentiometric, Kinetic, and Thermodynamic Studies

Abstract

The aim of this paper is to synthesize a cross-linked polymer containing imidazole groups and study its metal ion complex properties under different experimental conditions. Thus, the use of the potentiometric method for the determination of the protonation constant of vinyl imidazole VIM and the stability constant of the Zn2+ ion complex of VIM was investigated. First to determine the coordination tendency of the vinyl imidazole ligand towards the Zn2+ ions in solution, poly ethylene glycol dimethacrylate-n-vinyl imidazole [poly EGDMA– VIM ] microbeads average diameter 150–200 μm were synthesized. The microbeads were characterized by N2 adsorption/desorption isotherms, elemental analysis, energy dispersive spectroscopy EDS or EDX . Protonation constants of vinyl imidazole and the metal-ligand stability constant of vinyl imidazole with Zn2+ ions have been determined potentiometrically in a 0.1 M NaCl medium at 298, 318, and 338 K. The corresponding thermodynamic parameters of protonation and complexation processes ΔG, ΔH, and ΔS were derived and discussed. The formation kinetics of Zn2+-vinyl imidazole complex were also investigated, and the process obeyed the pseudo-second-order kinetic model.

Keywords

• Vinyl imidazole,insoluble polymers,Zn2+,beads

Vinil İmidazol İçeren IMAK Adsorbanının Zn2+ ile Kompleksleşmesi: Potansiyometrik, Kinetik ve Termodinamik Çalışmalar

Abstract

B u çalışmanın amacı imidazol grupları içeren çapraz bağlı bir polimerin metal iyonları ile kompleks oluşturma özelliklerinin araştırılmasıdır. Vinil imidazol VIM ligandının protonlanma sabiti ile Zn2+ iyonları ve VIM ligandları arasında oluşan kompleksin kararlılık sabitinin belirlenmesinde potansiyometrik yöntem kullanıldı. Vinil imidazol ligandının Zn2+ iyonlarına olan afinitesinin belirlenmesi için ilk olarak çapları 150–200 μm aralığında değişen poli etilenglikol dimetakrilat-n-vinil imidazol [poly EGDMA–VIM ] mikroküreler sentezlendi. Mikroküreler, elemental analiz, N2 adsorpsiyon/desorpsiyon izotermleri ve enerji dağılım spektroskopisi EDS veya EDX ile karakterize edildi. Vinil imidazol ligandının protonlanma sabiti ile VIM ligandı ile Zn2+ iyonları arasında oluşan kompleksin metal-ligand kararlılık sabiti 0.1 M NaCl ortamında 25 oC, 35 oC ve 45 oC sıcaklıkta potansiyometrik olarak belirlendi. Protonlanma ve kompleks oluşumuna ilişkin termodinamik parametreler ΔG, ΔH, and ΔS hesaplandı. Zn2+-vinil imidazol kompleksinin oluşum kinetiği incelendi ve yalancı-ikinci-mertebe olduğu belirlendi

Keywords

• Vinil imidazol,çapraz bağlı polimerler,Zn2+,küreler

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