Analysis of poly(amidoamine) dendrimer structure by UV-vis spectroscopy
We report a UV-vis spectroscopic study of four different types of poly(amidoamine) dendrimers. The results indicate that the degree of protonation of the interior tertiary amines of these dendrimers correlates directly to an absorption band with λ(max) in the range of 280-285 nm. Specifically, at lo...
| Veröffentlicht in: | Langmuir : the ACS journal of surfaces and colloids. - 1985. - 27(2011), 15 vom: 02. Aug., Seite 9609-13 |
|---|---|
| 1. Verfasser: | |
| Weitere Verfasser: | |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2011
|
| Zugriff auf das übergeordnete Werk: | Langmuir : the ACS journal of surfaces and colloids |
| Schlagworte: | Journal Article Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Dendrimers Organometallic Compounds Poly(amidoamine) Polyamines Platinum 49DFR088MY Palladium |
| Zusammenfassung: | We report a UV-vis spectroscopic study of four different types of poly(amidoamine) dendrimers. The results indicate that the degree of protonation of the interior tertiary amines of these dendrimers correlates directly to an absorption band with λ(max) in the range of 280-285 nm. Specifically, at low pH, the tertiary amines are protonated and the 280-285 nm band is absent. However, at elevated pH, when these groups are deprotonated, this band appears. Similar results were obtained for a simple model compound. The dependence of the 280-285 nm band on the chemical state of the tertiary amines of the dendrimers was confirmed by complexing them with Pd(2+) and Pt(2+). In this case the band disappears, and it only reappears when the metal ions are decomplexed following reduction with BH(4)(-). Finally, filtration experiments showed that the absorption band between 280-285 nm arises exclusively from intact, or nearly intact, dendrimers rather than low-molecular-weight fragments |
|---|---|
| Beschreibung: | Date Completed 03.11.2011 Date Revised 21.11.2013 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1520-5827 |
| DOI: | 10.1021/la201882t |