Dynamics of exchange in linear and cyclic supramolecular aggregates based on quadruple hydrogen bonding

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Samenvatting

Due to the high dimerization const. of ureidopyrimidinone (UPy), mols. contg. two such units form large polymeric aggregates, which are in equil. with cyclic species. We have investigated the dynamics of exchange in solns. of bifunctional compds. 1 and 2, using EXSY 2D-NMR and size exclusion chromatog. (SEC). Exchange spectroscopy on mixed linear aggregates of 1a and 1b shows that the kinetics of exchange between assocd. UPy units is different from that in monofunctional compds., and takes place via a long-lived intermediate. Simulation of size-exclusion chromatograms of compds. 2 show that exchange of mols. between cyclic dimers is fast on the chromatog. timescale, although it is slow on the NMR timescale. [on SciFinder (R)]
Originele taal-2Engels
TitelAbstracts of Papers, 224th ACS National Meeting, Boston, MA, United States, August 18-22, 2002
Plaats van productieWashington
UitgeverijAmerican Chemical Society
Pagina'sORGN-313
ISBN van geprinte versie0-8412-3840-5
StatusGepubliceerd - 2002
Evenement224th ACS National Meeting - Boston, Verenigde Staten van Amerika
Duur: 18 aug 200222 aug 2002

Congres

Congres224th ACS National Meeting
Land/RegioVerenigde Staten van Amerika
StadBoston
Periode18/08/0222/08/02
Ander224th ACS National Meeting, Fall meeting, Boston, MA, United States, August 18-22, 2002

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