Five- and six-fold coordinated silicon in silicodiphosphonates: short range order investigation by solid-state NMR spectroscopy

2020 ◽  
Vol 44 (11) ◽  
pp. 4613-4620 ◽  
Author(s):  
Christine Viehweger ◽  
Janine Kowalke ◽  
Erica Brendler ◽  
Sandra Schwarzer ◽  
Claudia Vogt ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Short Range ◽  
Short Range Order ◽  
Chemical Shifts ◽  
Range Order ◽  
Solid State Nmr Spectroscopy

Silicodiphosphonates synthesized by two different pathways show interesting chemical shifts of five- and sixfold coordinated silicon.

New Insights into the Short-Range Structures of Microporous Titanosilicates As Revealed by47/49Ti,23Na,39K, and29Si Solid-State NMR Spectroscopy

2014 ◽  
Vol 118 (47) ◽  
pp. 27353-27365 ◽  
Author(s):  
Jun Xu ◽  
Bryan E. G. Lucier ◽  
Zhi Lin ◽  
Andre Sutrisno ◽  
Victor V. Terskikh ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Short Range ◽  
Solid State Nmr Spectroscopy

scholarly journals Surface Chemistry of Nanohybrids with Fumed Silica Functionalized by Polydimethylsiloxane/Dimethyl Carbonate Studied Using 1H, 13C, and 29Si Solid-State NMR Spectroscopy

Molecules ◽  
2021 ◽  
Vol 26 (19) ◽  
pp. 5974
Author(s):  
Iryna S. Protsak ◽  
Yevhenii M. Morozov ◽  
Dong Zhang ◽  
Volodymyr M. Gun’ko
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Dimethyl Carbonate ◽  
Silica Surface ◽  
Chemical Shifts ◽  
Silica Nanoparticle ◽  
Inorganic Polymers ◽  
Solid State Nmr Spectroscopy ◽  
Nanosilica Particles

The investigation of molecular interactions between a silica surface and organic/inorganic polymers is crucial for deeper understanding of the dominant mechanisms of surface functionalization. In this work, attachment of various depolymerized polydimethylsiloxanes (PDMS) of different chain lengths, affected by dimethyl carbonate (DMC), to silica nanoparticles pretreated at different temperatures has been studied using 29Si, 1H, and 13C solid-state NMR spectroscopy. The results show that grafting of different modifier blends onto a preheated silica surface depends strongly on the specific surface area (SSA) linked to the silica nanoparticle size distributions affecting all textural characteristics. The pretreatment at 400 °C results in a greater degree of the modification of (i) A-150 (SSA = 150 m2/g) by PDMS-10/DMC and PDMS‑1000/DMC blends; (ii) A‑200 by PDMS-10/DMC and PDMS-100/DMC blends; and (iii) A-300 by PDMS-100/DMC and PDMS-1000/DMC blends. The spectral features observed using solid-state NMR spectroscopy suggest that the main surface products of the reactions of various depolymerized PDMS with pretreated nanosilica particles are the (CH3)3SiO-[(CH3)2SiO-]x fragments. The reactions occur with the siloxane bond breakage by DMC and replacing surface hydroxyls. Changes in the chemical shifts and line widths, as shown by solid-state NMR, provide novel information on the whole structure of functionalized nanosilica particles. This study highlights the major role of solid-state NMR spectroscopy for comprehensive characterization of functionalized solid surfaces.

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