Monitoring the thermodynamically-controlled formation of diimide-based resin-attached rotaxanes by gel-phase HR MAS 1H NMR spectroscopy.
The thermodynamically controlled self-assembly of rotaxane and pseudorotaxane systems consisting of (i) a naphthodiimide thread unit terminated at one end with a pyridine ligand, and covalently linked at the other to a gel-phase polystyrene resin support, (ii) a dinaphtho-crown ether shuttle unit, and (iii) a ruthenium carbonyl metalloporphyrin stopper unit, is investigated by high resolution magic angle spinning proton (HR MAS 1H) NMR spectroscopy. The effects of variable concentration of the solution-phase components, the temperature, and added Li+ and Na+ ions are described, and the limitations of the technique are addressed. The dynamic behaviour is compared directly to the solution-phase analogues, where a bulky stopper group is substituted for the polystyrene resin bead.
Mullen
Kathleen M
KM
Department of Chemistry, School of Science and Technology, the University of New England, Armidale, NSW 2351, Australia.
Johnstone
Ken D
KD
Webb
Matthew
M
Bampos
Nick
N
Sanders
Jeremy K M
JK
Gunter
Maxwell J
MJ
D003188:Composite Resins / Q000737:chemistry*; D005782:Gels / Q000737:chemistry; D007094:Imides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods* / Q000592:standards; D015394:Molecular Structure; D011522:Protons; D012015:Reference Standards; D043862:Rotaxanes / Q000138:chemical synthesis* / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013816:Thermodynamics
D003188:Composite Resins; D005782:Gels; D007094:Imides; D011522:Protons; D043862:Rotaxanes; D012996:Solutions