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Titolo:
Surface grafting of cobalt complexes on polymeric supports: Evidence for site isolation and applications to reversible dioxygen binding
Autore:
Sharma, AC; Joshi, V; Borovik, AS;
Indirizzi:
Univ Kansas, Dept Chem, Lawrence, KS 66045 USA Univ Kansas Lawrence KS USA 66045 nsas, Dept Chem, Lawrence, KS 66045 USA
Titolo Testata:
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
fascicolo: 6, volume: 39, anno: 2001,
pagine: 888 - 897
SICI:
0887-624X(20010315)39:6<888:SGOCCO>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULARLY IMPRINTED POLYMERS; POROUS ORGANIC HOSTS; OXYGEN ADDUCTS; RECOGNITION; SEPARATION; RESONANCE; CATALYSIS;
Keywords:
surface grafting; site isolation; reversible dioxygen binding;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Borovik, AS Univ Kansas, Dept Chem, 2010 Malot Hall, Lawrence, KS 66045 USA Univ Kansas 2010 Malot Hall Lawrence KS USA 66045 KS 66045 USA
Citazione:
A.C. Sharma et al., "Surface grafting of cobalt complexes on polymeric supports: Evidence for site isolation and applications to reversible dioxygen binding", J POL SC PC, 39(6), 2001, pp. 888-897

Abstract

Imprinted polymers were synthesized using the surface-grafting technique with [Co(III)1(vpy)(dmap)]PF6 {1, bis[2-hydroxy-4-(4-vinylbenzyloxy)benzaldehyde] ethylene-diimine; vpy: 4 -vinylpyridine; dmap : N,N'-dimethyl-4-aminopyridine} as the template. The metallated sites were probed using spectroscopic techniques including UV-vis, Fourier transform infrared, and electron paramagnetic resonance (EPR) spectroscopies to investigate the site architecture and isolation of the immobilized sites in the surface-grafted polymers. EPR studies showed a distribution of four and five coordinated sites similar to the bulk copolymers, and the surface-grafted polymer showed reversible binding to dioxygen in multiple cycles. Both results indicated site isolation in the surface-grafted polymers analogous to the bulk polymers. Although the dioxygen binding in surface-grafted polymers is reversible, the spin density decreases to 50% in the third cycle as opposed to bulk copolymers. This indicates that the sites are more heterogeneous and more exposed tothe environment than the analogous sites in bulk copolymers. (C) 2001 JohnWiley & Sons, Inc.

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Documento generato il 28/09/20 alle ore 18:09:51