English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/116716
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:


Radical dendrimers: a family of five generations of phosphorus dendrimers functionalized with TEMPO radicals

AuthorsBadetti, Elena ; Lloveras, Vega ; Muñoz Gómez, José L.; Sebastián, Rosa M.; Sebastián, Rosa M.; Caminade, Anne M.; Majoral, Jean P.; Veciana, Jaume ; Vidal Gancedo, José
Issue Date25-Nov-2014
PublisherAmerican Chemical Society
CitationMacromolecules 47(22): 7717- 7724 (2014)
Abstract© 2014 American Chemical Society. Five novel generations of phosphorus dendrimers based on a cyclotriphosphazene core with stable TEMPO radicals end groups have been synthesized and studied by EPR, SQUID, 1H NMR, 31P NMR, FT-IR, and UV-vis spectroscopy. The nitroxyl radicals exhibit a strong exchange interaction, which depends on the dendrimer generation and the temperature. An |fms| = 2 transition has been observed in each generation in dilution conditions demonstrating the intramolecular origin of the radicals interaction. There exists a direct proportionality between the EPR |Δms| = 2 transition intensity and the number of radicals by generation; consequently, the utility of EPR for the determination of the substitution efficiency on dendrimers by paramagnetic species is quite good. From the UV-vis characterization, we have observed that the molar extinction coefficient value is also proportional to the number of TEMPO groups. The magnetic properties of the zero, first and fourth generation dendrimers studied by SQUID magnetometry show antiferromagnetic interaction between radicals.
Identifiersdoi: 10.1021/ma502062q
e-issn: 1520-5835
issn: 0024-9297
Appears in Collections:(ICMAB) Artículos
Files in This Item:
File Description SizeFormat 
BADETTI-Macrom-2014-postprint.pdf2,83 MBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.