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

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 Is → σ* orbital transitions were determined at the C, N and O K edges. The influence of Cu 2+ on the transitions of Is → π*(N-H) at 401 eV, and Is → 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.