Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Probing the structure of immobilized metal sites in porous organic hosts by X-ray absorption spectroscopy
Autore:
Padden, KM; Krebs, JF; Trafford, KT; Yap, GPA; Rheingold, AH; Borovik, AS; Scarrow, RC;
Indirizzi:
Univ Kansas, Dept Chem, Lawrence, KS 66045 USA Univ Kansas Lawrence KS USA 66045 nsas, Dept Chem, Lawrence, KS 66045 USA Haverford Coll, Dept Chem, Haverford, PA 19041 USA Haverford Coll Haverford PA USA 19041 Dept Chem, Haverford, PA 19041 USA Univ Delaware, Dept Chem, Newark, DE 19716 USA Univ Delaware Newark DE USA 19716 laware, Dept Chem, Newark, DE 19716 USA
Titolo Testata:
CHEMISTRY OF MATERIALS
fascicolo: 11, volume: 13, anno: 2001,
pagine: 4305 - 4313
SICI:
0897-4756(200111)13:11<4305:PTSOIM>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENANTIOSELECTIVE EPOXIDATION; COBALT(III) COMPLEX; DIOXYGEN BINDING; POLYMERS; COORDINATION; OLEFINS; IRON; SELECTIVITY; ANALOG; SOLIDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Scarrow, RC Univ Kansas, Dept Chem, Lawrence, KS 66045 USA Univ Kansas Lawrence KS USA 66045 hem, Lawrence, KS 66045 USA
Citazione:
K.M. Padden et al., "Probing the structure of immobilized metal sites in porous organic hosts by X-ray absorption spectroscopy", CHEM MATER, 13(11), 2001, pp. 4305-4313

Abstract

Template copolymerization methods have been used to make materials for a wide variety of applications where site-specific analyte binding is desired. The structure of the binding site is often crucial to the efficient function of the material. We have immobilized cobalt-containing template complexes in porous organic hosts, allowing the use of spectroscopy to convenientlyprobe the site structure. Reported herein are results from X-ray diffraction and X-ray absorption spectroscopy (XAS) studies for a series of monomers{[Co(III)1(dmap)(2)][PF6] and [Co(III)2(1-MeIm)][PF6], where 1 is the ligand bis[2-hydroxy-4-(4-vinylbenzylmethoxy)benzaldehyde]ethylenediimine and 2is bis[2-hydroxy-4-(4-vinylbenzylmethoxy)benzyliminopropyl]methyl amine} and related copolymers. Copolymerization of the 6-coordinate complex [Co(III)1(dmap)(2)][PF6] with an organic cross-linker forms immobilized 6-coordinate cobalt sites in P-1[Co-III(dmap)(2)]. Similar findings were obtained forthe formation of immobilized cobalt sites in P-2[Co-III(1-MeIm)]. Demetalation of P-1[Co-III(dmap)(2)] and P-2[Co-III(1-MeIm)] affords immobilized sites that contain tetra- or pentadentate ligands, respectively. Rebinding ofCoo ions affords P-1[Co-II] with sites containing cobalt complexes having square planar coordination geometry, whereas P-2[Co-II] has immobilized square pyramidal cobalt complexes. XAS studies support these coordination geometry assignments and show that the rigidity of the porous host maintains site architecture even after chemical modification.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 00:33:49