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Titolo:
THE SLIPPING APPROACH TO SELF-ASSEMBLING [N]ROTAXANES
Autore:
ASAKAWA M; ASHTON PR; BALLARDINI R; BALZANI V; BELOHRADSKY M; GANDOLFI MT; KOCIAN O; PRODI L; RAYMO FM; STODDART JF; VENTURI M;
Indirizzi:
UNIV BIRMINGHAM,SCH CHEM,POB 363 BIRMINGHAM B15 2TT W MIDLANDS ENGLAND UNIV BIRMINGHAM,SCH CHEM BIRMINGHAM B15 2TT W MIDLANDS ENGLAND CNR,IST FRAE I-40129 BOLOGNA ITALY UNIV BOLOGNA,DIPARTIMENTO CHIM G CIAMICIAN I-40126 BOLOGNA ITALY
Titolo Testata:
Journal of the American Chemical Society
fascicolo: 2, volume: 119, anno: 1997,
pagine: 302 - 310
SICI:
0002-7863(1997)119:2<302:TSATS[>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARAQUAT; )2>ROTAXANES; COMPLEXATION; ROTAXANES; SLIPPAGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
M. Asakawa et al., "THE SLIPPING APPROACH TO SELF-ASSEMBLING [N]ROTAXANES", Journal of the American Chemical Society, 119(2), 1997, pp. 302-310

Abstract

A synthetic approach-namely slippage-to self-assembling [n]rotaxanes incorporating pi-electron deficient bipyridinium-based dumbbell-shapedcomponents and pi-electron-rich hydroquinone- and/or dioxynaphthalene-based macrocyclic polyether components has been developed. The kinetics of rotaxane formation by the slipping procedure were investigated by absorption UV-visible and H-1-NMR spectroscopies in a range of temperatures and solvents, varying systematically the size of both the stoppers and the macrocyclic components. As expected, the rate constants for these processes are affected by the size complementarity between macrocycles and stoppers. Furthermore, the enthalpic and entropic contributions to the free energies of activation associated with the slippage and the effect of solvent polarity upon the outcome of these processes have been evaluated. In addition, the spectroscopic and electrochemical properties of some of the rotaxanes are presented and discussed with reference to the properties of their chromophoric and electroactive units.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 10:28:43