| Autor: |
Rathnayake AS; Department of Chemistry , University of Missouri , 601 S. College Avenue , Columbia , Missouri 65211 , United States., Fraser HWL; EaStCHEM School of Chemistry , The University of Edinburgh , David Brewster Road , Edinburgh EH9 3FJ , United Kingdom., Brechin EK; EaStCHEM School of Chemistry , The University of Edinburgh , David Brewster Road , Edinburgh EH9 3FJ , United Kingdom., Dalgarno SJ; Institute of Chemical Sciences , Heriot-Watt University , Riccarton, Edinburgh EH14 4AS , United Kingdom., Baumeister JE; Department of Chemistry , University of Missouri , 601 S. College Avenue , Columbia , Missouri 65211 , United States., Rungthanaphatsophon P; Department of Chemistry , University of Missouri , 601 S. College Avenue , Columbia , Missouri 65211 , United States., Walensky JR; Department of Chemistry , University of Missouri , 601 S. College Avenue , Columbia , Missouri 65211 , United States., Barnes CL; Department of Chemistry , University of Missouri , 601 S. College Avenue , Columbia , Missouri 65211 , United States., Atwood JL; Department of Chemistry , University of Missouri , 601 S. College Avenue , Columbia , Missouri 65211 , United States. |
| Abstrakt: |
Two structurally analogous Mn-seamed C-alkylpyrogallol[4]arene (PgC n )-based metal-organic nanocapsules (MONCs) have been synthesized under similar reaction conditions and characterized by crystallographic, electrochemical, and magnetic susceptibility techniques. Both MONCs contain 24 Mn centers, but, somewhat surprisingly, marked differences in oxidation state distribution are observed upon analysis. One MONC contains exclusively Mn II ions, while the other is a mixed-valence Mn II / Mn III assembly. We propose that these disparate oxidation state distributions arise from slight differences in pH achieved during synthesis, a factor that may lead to many spectacular new MONCs (and associated host-guest chemistries). |
