Near Edge X-Ray Absorption Fine Structure (NEXAFS) Studies of Copper Ion-Containing PAMAMOS Dendrimer Networks

✍ Scribed by Robert A. Bubeck; Petar R. Dvornic; Jin Hu; Alexander Hexemer; Xuefa Li; Steven E. Keinath; Daniel A. Fischer

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 320 KB
• Volume: 206
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200400341

✦ Synopsis

Abstract

Summary: The interaction of Cu^2+^ with C, N and O moieties in nanocomposites containing copper ions complexed in poly(amidoamine‐organosilicon), PAMAMOS, dendrimer networks was characterized using near edge X‐ray absorption fine structure (NEXAFS). The effects on the 1s → π* and 1s → σ* orbital transitions were determined at the C, N and O K edges. The influence of Cu^2+^ on the transitions of 1s → π*(NH) at 401 eV, and 1s → σ*(NC) type transitions at 412 eV within the N edge increased with increasing Cu^2+^ content up to the theoretical limit of the copper‐accommodating capacity of the PAMAMOS dendrimer used. As ligands, the carbonyls were found to saturate at much lower Cu^2+^ concentrations compared with those associated with N.

NEXAFS spectrum of a PAMAMOS[4,1]DMOMS dendrimer network.

imageNEXAFS spectrum of a PAMAMOS[4,1]DMOMS dendrimer network.