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Structure and photoluminescent features of di-amide cross-linked alkylene-siloxane hybrids

Nunes, S. C. (författare)
Universidade de Tras-os-Montes e Alto Douro,University of Trás-os-Montes and Alto Douro
Bermudez, V. D. (författare)
Universidade de Tras-os-Montes e Alto Douro,University of Trás-os-Montes and Alto Douro
Cybinska, J. (författare)
Universidade de Aveiro,University of Aveiro,Uniwersytet Wrocławski,University of Wrocław
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Ferreira, R. A. S. (författare)
Universidade de Aveiro,University of Aveiro
Legendziewicz, J. (författare)
Uniwersytet Wrocławski,University of Wrocław
Carlos, L. D. (författare)
Universidade de Aveiro,University of Aveiro
Silva, M. M. (författare)
Universidade do Minho,University of Minho
Smith, M. J. (författare)
Universidade do Minho,University of Minho
Ostrovskii, Denis, 1967 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
Rocha, J. (författare)
Universidade de Aveiro,University of Aveiro
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 (creator_code:org_t)
Royal Society of Chemistry (RSC), 2005
2005
Engelska.
Ingår i: Journal of Materials Chemistry. - : Royal Society of Chemistry (RSC). - 1364-5501 .- 0959-9428. ; 15:35-36, s. 3876-3886
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • Novel amide cross-linked alkylene-siloxane hybrid materials (di-amidosils) synthesized by the sol-gel process have been investigated. Two samples identified by the notation d-A(x) with x = 4 and 8 (where x is the number of methylene groups of the alkylene chain) have been produced as transparent, amorphous, rigid monoliths. The d-A(8) material is thermally stable up to approximately 245°C. In this hybrid the siliceous framework is mainly composed of [-(CH2)Si(OSi)3)] and [-(CH 2)Si(OSi)2(OH)] substructures. Structural unit distances of 4.1 and 4.2 Å and average interparticle distances of 12 and 17 A have been determined for d-A(4) and d-A(8), respectively. In these compounds the alkylene chains are disordered and adopt gauche conformations. While a negligible proportion of the amide linkages remain non-bonded, the great majority of these groups belong to highly disordered strong hydrogen-bonded amide-amide associations. The hybrids introduced are room temperature white light emitters, presenting an intense, broad emission band in the blue/purplish-blue spectral region. The origin of such a band has been ascribed to the convolution of donor-acceptor pair (D-A) recombinations that occur in the NH groups of the amide linkages and in the siliceous nanodomains. The maximum quantum yield value of the d-A(8) di-amidosil is 5.4%.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Annan teknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Other Engineering and Technologies (hsv//eng)

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