Syntheses of poly[(dimethyl)-co-(4,7,10,13-tetraoxatetradecylmethylsilanes)].An evaluation of the use of C8K versus Na in the preparation of polysilanes

A new solution route for the synthesis of silicon nanoparticles presenting different surface substituents

“…A similar observation raised from 13 C NMR analysis, which showed signals corresponding to the presence of THF (w27 and 70 ppm) and ring opening products (w16, 20, 30 and 64 ppm). 29 Si NMR exhibited signals between 12 and À86 ppm, which were assigned to silicon atoms bonded with 3 to 0 Cl atoms, respectively [33,34]. Elemental analysis led to the following stoichiometry Si 1 Cl 1.53 C 2.26 H 4.69 in agreement with the presence of organic residues formed by reaction with THF (calculated Si 1 Cl 0.12 ).…”

“…However, as for M0, several peaks attributed to compounds formed by side reaction with THF were still observed. The solid-state 29 Si NMR exhibited several signals in the region from 20 to À90 ppm. There are very few examples of Si-np 29 Si NMR studies [15,35].…”

“…The solid-state 29 Si NMR exhibited several signals in the region from 20 to À90 ppm. There are very few examples of Si-np 29 Si NMR studies [15,35]. The size distribution of the Sinp and the numerous different chemical environment of silicon widen the signal.…”

“…Chemical shifts are referenced in pats per million. Solid-phase NMR spectra were recorded at room temperature with a BRUKER ADVANCE DPX 300 spectrometer ( 13 C, 29 Si). Elemental analysis was performed at the ''Laboratoire central d'analyse du CNRS'' in Vernaison, France.…”

“…4. Solid-state 29 Si MAS NMR spectra of S1 and S2. spectrum, we compared them to the spectrum of the hydroxy sample S1 and to the literature [36].…”