Organic–inorganic nanotube hybrids: Organosilica-nanotubes containing ethane, ethylene and acetylene groups

Fischer, Christian; Raith, Alexander; Mink, J.; Raudaschl‐Sieber, Gabriele; Cokoja, Mirza; Kühn, Fritz E.

doi:10.1016/j.jorganchem.2011.03.031

Cited by 11 publications

(6 citation statements)

References 60 publications

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“…The vibration bands observed at 1410 and 1594 cm À1 inferred the CH 2 scissoring and C¼C stretching mode, respectively. The above vibrational frequencies were well matched with the reported organosilica nanotubes [32,33]. Similarly, the Raman spectrum was obtained for composite.…”

Section: Resultssupporting

confidence: 84%

“…The peaks at 383 cm À1 was assigned to the vibration of SiO 3 symmetric deformation mode and two vibration bands were observed at 480 and 517 cm À1 which indicates the antisymmetric deformation mode of SiO 3 respectively [32]. The Raman vibration bands between 570 and 650 cm À1 were strongly represented the Si-C stretching mode [32,33]. The strong bands at 819 cm À1 was associated to the Si-O-Si symmetric stretching vibration and small peaks were observed between 1050 and 1170 cm À1 assigned to the antisymmetric stretching vibration of Si-O-Si bond [33].…”

Section: Resultsmentioning

confidence: 95%

“…The Raman vibration bands between 570 and 650 cm À1 were strongly represented the Si-C stretching mode [32,33]. The strong bands at 819 cm À1 was associated to the Si-O-Si symmetric stretching vibration and small peaks were observed between 1050 and 1170 cm À1 assigned to the antisymmetric stretching vibration of Si-O-Si bond [33]. The vibration bands observed at 1410 and 1594 cm À1 inferred the CH 2 scissoring and C¼C stretching mode, respectively.…”

Section: Resultsmentioning

confidence: 97%

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Hydrothermal synthesis and characterization of Co2.85Si0.15O4 solid solutions and its carbon composite as negative electrodes for Li-ion batteries

Sivalingam¹,

Karthikeyan

Vasylechko

et al. 2015

Electrochimica Acta

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 97%

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Hydrothermal synthesis and characterization of Co2.85Si0.15O4 solid solutions and its carbon composite as negative electrodes for Li-ion batteries

Sivalingam¹,

Karthikeyan

Vasylechko

et al. 2015

Electrochimica Acta

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“…After the adsorption of C 2 H 2 over pyroxene at RT, two new peaks at 1927 and 672 cm −1 appeared. According to the literature [42], the peak at 1927 cm −1 can be assigned to the stretching vibration of the triple bond of the acetylene molecule and the peak at 672 cm −1 to the Si−C stretching vibration. This result suggests that pyroxene can adsorb C 2 H 2 at RT via the interaction of Lewis acid sites (such as Fe 2+ or Al 3+ ) with the triple bond of acetylene as reported in the literature [29].…”

Section: Resultsmentioning

confidence: 99%

Catalytic conversion of acetylene to polycyclic aromatic hydrocarbons over particles of pyroxene and alumina

Tian

Liu

Hammonds

et al. 2013

Phil. Trans. R. Soc. A.

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Polycyclic aromatic hydrocarbons (PAHs) are known to be present in many astrophysical objects and environments, but our understanding of their formation mechanism(s) is far from satisfactory. In this paper, we describe an investigation of the catalytic conversion reaction of acetylene gas to PAHs over pyroxene and alumina. Crystalline silicates such as pyroxenes (with general formula [Mg, Fe]SiO 3 ) and alumina (Al 2 O 3 ) are observed astrophysically through their infrared spectra and are likely to promote grain surface chemical reactions. In the experiments reported here, gas-phase PAHs were produced by the catalytic reaction of acetylene over crystalline silicates and alumina using a pulsed jet expansion technique and the gaseous products detected using time-of-flight mass spectrometry. In a separate experiment, the catalytic formation of PAHs from acetylene was further confirmed with acetylene gas at atmospheric pressure flowing continuously through a fixed-bed reactor. The gas effluent and carbonaceous compounds deposited on the catalysts were dissolved separately in dichloromethane and analysed using gas chromatography–mass spectrometry. Among the samples studied, alumina showed higher activity than the pyroxene-type grains for the acetylene reaction. It is proposed that formation of the PAHs relies on the Mg 2+ ions in the pyroxenes and Al 3+ ions in alumina, where these ions act as Lewis acid sites. X-ray diffraction, Fourier transform infrared and high-resolution transmission electron microscopy techniques were used to characterize the structure and physical properties of the pyroxene and alumina samples.

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“…Organosilica nanotubes are a new class of one-dimensional organic–inorganic hybrid materials. − So far, ethane–, ethylene–, ,, and phenylene–silica nanotubes have been synthesized from 100% organic-bridged alkoxysilane precursors [(R′O) 3 Si-R-Si(OR′) 3 ] using a single-micelle-templating method. The organically modified silica nanotubes ,,,, and water-soluble organosilica nanotubes templated by core–shell–corona structure cylindrical polymer brushes were also synthesized. Since various organic functionalities can be incorporated into the tube wall, these materials have attracted much attention due to their potential use in various applications such as catalysts, adsorbents, and optical devices.…”

Section: Introductionmentioning

confidence: 99%

Excited-State Dynamics of Phenylene Moieties in a Framework of the Organosilica Nanotube

et al. 2017

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To understand the excited-state dynamics of Ph moieties in a framework of the phenylene−silica nanotube (Ph-NT), temperature and time dependence of the fluorescence were investigated. The time dependence of the Ph exciton fluorescence and excimer fluorescence was successfully analyzed by the model including the diffusion of the Ph excitons and their subsequent trapping at the defect center and the excimer sites. The energy migration of the Ph exciton in the Ph-NT is suggested similarly to phenylenebridged periodic mesoporous organosilica (Ph-PMO) powder with crystal-like wall structure, although X-ray diffraction of Ph-NT indicates less molecular-level periodicity of Ph moieties in the framework of the nanotube. The excited-state dynamics of Ph moieties in Ph-NT will be discussed by comparing that of Ph-PMO.

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Organic–inorganic nanotube hybrids: Organosilica-nanotubes containing ethane, ethylene and acetylene groups

Cited by 11 publications

References 60 publications

Hydrothermal synthesis and characterization of Co2.85Si0.15O4 solid solutions and its carbon composite as negative electrodes for Li-ion batteries

Hydrothermal synthesis and characterization of Co2.85Si0.15O4 solid solutions and its carbon composite as negative electrodes for Li-ion batteries

Catalytic conversion of acetylene to polycyclic aromatic hydrocarbons over particles of pyroxene and alumina

Excited-State Dynamics of Phenylene Moieties in a Framework of the Organosilica Nanotube

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