Document Details

Document Type : Article In Journal 
Document Title :
Iron Chelation by Polyamidoamine Dendrimers: A Second-Order Kinetic Model for Metal-Amine Complexation
إزالة الحديد باستخدام مركب اميدو أمين المتعدد: نموذج الدرجة الثانية الحركية لعملية التفاعل بين المعدن والأمين
Document Language : English 
Abstract : This study presents a kineticmodel of the chelation of iron ions by generation 4 hydroxyl-terminated polyamidoamine (PAMAM) with ethylenediamine core (G4-OH). The coordination processes of iron ions from ferric chloride, FeCl3, and ferrous bromide, FeBr2, to G4-OH dendrimers were analyzed using ultravioletvisible (UVvis) spectroscopy, proton nuclear magnetic resonance (1H NMR) spectroscopy, and liquid chromatographymass spectrometry (LCMS). In the visible region, a charge-transfer was observed when the dendrimer was added to a ferric chloride solution. This phenomenon is a ligand-to-metal charge-transfer (LMCT) between the free electron group of the dendrimer’s internal amines and the dehalogenated iron ion that takes 2 h to complete at room temperature. Analysis of potential rate laws and diffusion effects led to a second-order kinetic model for this reaction. By measuring the rate coefficients as a function of temperature (2237 C), an apparent activation energy of 41.5 kJ/mol was obtained using the Arrhenius method. The results of this study will fuel research of PAMAM dendrimers for environmental, pharmaceutical, and materials applications. 
ISSN : 1520-6106 
Journal Name : The Journal of Physical Chemistry B 
Volume : 2 
Issue Number : 115 
Publishing Year : 1432 AH
2011 AD
Article Type : Article 
Added Date : Monday, February 13, 2012 


Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
محمد حسن رمضانRamadan, Mohamed


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