1. Synthesis and characterization of poly(ethyleneimine) dendrimers
- Author
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Omprakash Yemul and Toyoko Imae
- Subjects
Polymers and Plastics ,Ethyleneimine ,Ethylenediamine ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,chemistry ,Bromide ,Dendrimer ,Polymer chemistry ,Materials Chemistry ,Amine gas treating ,Physical and Theoretical Chemistry ,Gabriel synthesis ,Luminescence ,Divergent synthesis - Abstract
Poly(ethyleneimine) (PEI) dendrimers up to the third generation (G3) were prepared by a divergent synthesis method from an ethylenediamine (EDA) core. The amine terminals were bonded with vinylbromide by a Michael addition reaction. Then, the bromide terminals were converted to amine groups using a Gabriel amine synthesis method. PEI dendrimers displayed pH-dependent luminescence, and their emission intensities at pH 6 increased over time. Fluorescence intensities also increased with increasing dendrimer generation from G1 to G3. Air-bubbling in aqueous solutions of dendrimers made to incorporate detectable amount of oxygen in dendrimers. EDA also behaved similarly in luminescence and oxygen incorporation.
- Published
- 2008
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