Chemische Reaktionen bei der Herstellung von Lichtwellenleitern für die optische Datenfernübertragung

Binnewies, Michael; Jerzembeck, Marion; Kornick, A.

doi:10.1002/ange.19911030705

Cited by 14 publications

(12 citation statements)

References 53 publications

(2 reference statements)

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“…4͒; and ͑d͒ a planar eightmembered ring of D 4h -symmetry ͑like Si 4 O 4 Cl 8 ͒. 15 Subsequently frequency calculations have shown whether the obtained structure is a minimum or only a saddle point on the hypersurface. The energetic global minimum of all isomers is the puckered eight-membered ring of D 2d -symmetry.…”

Section: Si 4 Omentioning

confidence: 96%

Raman-spectroscopy of oligomeric SiO species isolated in solid methane

Friesen

Junker

Zumbusch

et al. 1999

The Journal of Chemical Physics

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From the IR-spectra of matrix isolated SiO species a D 2h -structure has been postulated for the dimer and a D 3h -structure for the trimer. High quality Raman-spectra-necessary for the complete characterization-were missing so far. Here we report the Raman-spectra especially of the totally symmetric vibrations for Si 2 O 2 and Si 3 O 3 and their 16 O/ 18 O isotopomers isolated in solid methane. We also detect the most intense A 1 -vibration of Si 4 O 4 and can assign it with its 16 O/ 18 O isotopic splitting. Ab initio calculations for all oligomers are presented in order to support the assignment of the spectra and to obtain geometric and energetic information about the oligomeric species which have been detected experimentally.

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Section: Si 4 Omentioning

confidence: 96%

Raman-spectroscopy of oligomeric SiO species isolated in solid methane

Friesen

Junker

Zumbusch

et al. 1999

The Journal of Chemical Physics

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“…[2] Assuming its existence, most reated via a photoinduced reaction between Cl 2 and SiO in sultant products can easily be elucidated, for example Si 2-solid argon, some years ago, [3] literature provides no direct OCl 6 can be regarded as a reaction product between OSiCl 2 information about the thermodynamic stability of this speand SiCl 4 . A reaction of OSiCl 2 with a catenasiloxan cies.…”

Section: Quantum Chemical Calculationsmentioning

confidence: 99%

The Detection of O=SiCl2 as an Intermediate During the Combustion Process of SiCl4 with O2

Junker

Wilkening

Binnewies

et al. 1999

Eur. J. Inorg. Chem.

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During the technical important combustion of SiCl4 with oxygen [SiCl4(g) + O2(g) = SiO2(s) + 2·Cl2(g)] many intermediates have been detected in the past. However, the presence of the primary species O=SiCl2 has been discussed controversially until today. With the help of matrix isolation technique we have now been successful to monitor O=SiCl2 via its IR spectrum. With the help of quantum chemical calculations the thermodynamic data have been calculated first. On this basis it was possible to find the optimal conditions to trap OSiCl2 from the high‐temperature equilibrium. Furthermore it could be shown via IR spectroscopy and quantum chemical calculations, that the radical OSiCl does not play a significant role within this combustion process.

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“…This is indeed the case at temperatures above 1000 C. However, at lower temperatures between 700-1000 C a multitude of chlorosiloxanes of the composition Si l O m Cl n is formed. 1,2 The structure and stability of chlorosiloxanes, 3 their growth pattern 4 and their decomposition 5 has been the subject of our previous research work on this topic. Among the siloxanes the silsesquioxanes of the composition Si n O 3n/2 Cl n are of special interest.…”

Section: Introductionmentioning

confidence: 99%