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Lamellar mono-amidosil hybrids incorporating monomethinecyanine dyes

Journal of Materials Chemistry C, ISSN: 2050-7534, Vol: 1, Issue: 12, Page: 2290-2301
2013
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    10
    • Citation Indexes
      10
  • Captures
    13

Article Description

Mono-amide cross-linked alkyl-siloxane hybrids synthesized through the sol-gel process and the self-directed assembly have been doped with variable concentrations of monomethinecyanines SSCH(CH )I, SSCHCl and SSCHClO . The host matrix m-A(14) is a lamellar structured hybrid composed of short methyl-capped alkyl chains grafted to the siliceous framework through amide groups. The doped mono-amidosil hybrid materials were obtained as solid powders. The bulky SSCH(CH)I dye inhibited the condensation of the silica network. In the SSCHCl- and SSC HClO-doped m-A(14)-based materials the original lamellar structure coexists with a new lamellar ordered phase with a lower interlamellar distance in which the alkyl chains adopt essentially all-trans conformations. The efficient encapsulation of these two dyes by m-A(14), which ensures their complete dissolution, is due to the coordination of the S atoms of SSCHCl and SSCHClO to the carbonyl oxygen atoms of the amide cross-links. This process leads to a major breakdown of the disordered and ordered hydrogen-bonded aggregates of m-A(14), but does not affect globally the strength of the hydrogen-bonded array. The most dilute SSCHClO -doped mono-amidosil studied displays room temperature emission in the visible spectral region (380-680 nm) due to the convolution of the intrinsic emission (blue spectral region) of m-A(14) with that of the SSC HClO dye (green and red spectral regions) due to the formation of fluorescent J-dimers. The excitation spectra (monitored along the emission spectra) reveal the occurrence of host-to-monomethinecyanine energy transfer. © 2013 The Royal Society of Chemistry.

Bibliographic Details

S. C. Nunes; C. B. Ferreira; J. Hümmer; R. A. S. Ferreira; L. D. Carlos; P. Almeida; V. de Zea Bermudez

Royal Society of Chemistry (RSC)

Chemistry; Materials Science

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