Document Details
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Document Type |
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Article In Journal |
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Document Title |
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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 |
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Document Language |
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English |
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Abstract |
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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. |
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ISSN |
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1520-6106 |
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Journal Name |
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The Journal of Physical Chemistry B |
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Volume |
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2 |
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Issue Number |
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115 |
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Publishing Year |
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1432 AH
2011 AD |
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Article Type |
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Article |
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Added Date |
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Monday, February 13, 2012 |
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Researchers
| محمد حسن رمضان | Ramadan, Mohamed Hassan | Researcher | Doctorate | mhmram@hotmail.com |
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