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

Published

October 12, 2021

Author(s)

Robert A. Bubeck, P Dvornic, J Hu, A Hexemer, X Li, S E. Keinath, Daniel A. Fischer

Abstract

The interaction of Cu2+ with C, N and O moieties in poly(amidoamine-organosilicon) (PAMAMOS/DMOMS) dendrimer networks was characterized at room temperature using near edge X-ray absorption fine structure (NEXAFS). In particular, the effects on the 1s * and 1s * orbital transitions were determined at the N and O edges by noting the decrease in partial electron yield (PEY) after subtraction of the spectra of the Cu-containing dendrimer networks from that of the corresponding copper free sample. The influence of Cu2+ on the 1s * (N-H) and 1s *(N-C2) transitions within the N edge increased with increasing Cu2+ content up to the theoretical limit of the copper-accommodating capacity of the PAMAMOS dendrimer used. There is virtually no detected influence of the 1s *(N-C3) transition due to the near trigonal symmetry of the moiety. The degree of copper interaction with dendrimer when C1-1 anion was present was approximately half that when SO42+ anion was present. Results suggests that the interaction with the carbonyl moiety was maximized at very low levels of cation content and that N was the more important ligand than O in forming complex

Citation

Macromolecules

Pub Type

Journals

Keywords

dendrimer, dendrimer networks, nanocomposite, NEXAFS, PANAMOS

Citation

Bubeck, R. , Dvornic, P. , Hu, J. , Hexemer, A. , Li, X. , Keinath, S. and Fischer, D. (2021), Near Edge X-Ray Absorption Fine Structure (NEXAFS) Studies of Metal Ion-Containing PAMAMOS Dendrimer Networks, Macromolecules (Accessed December 6, 2024)