Document Detail

Encapsulation of functional moieties within branched star polymers: effect of chain length and solvent on site isolation.
MedLine Citation:
PMID:  11273596     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Porphyrin and pyrene photoactive cores have been encapsulated within an isolating polymeric shell using an efficient and general strategy based on the use of dendritic initiators for the ring-opening polymerization of epsilon-caprolactone to yield functional core star polymers. The isolation of the core functionalities has been studied using fluorescence quenching and fluorescence resonance energy transfer (FRET) techniques as well as solvatochromic probes. With increasing chain length as well as solvent polarity, enhanced site isolation of the core has been observed. These findings have been correlated to actual molecular dimensions independently measured by pulsed field gradient spin-echo (PGSE) NMR. The developed synthetic methodology offers a rapid route to efficient encapsulation of functional moieties and therefore has potential for the design of new materials.
S Hecht; N Vladimirov; J M Fréchet
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  123     ISSN:  0002-7863     ISO Abbreviation:  J. Am. Chem. Soc.     Publication Date:  2001 Jan 
Date Detail:
Created Date:  2001-05-31     Completed Date:  2001-09-06     Revised Date:  2003-10-31    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  18-25     Citation Subset:  -    
Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.
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