Silanol groups in minerals and inorganic compounds

Other| February 01, 1998 Silanol groups in minerals and inorganic compounds Daniel Nyfeler; Daniel Nyfeler Universitaet Bern, Laboratorium fuer Chemische und Mineralogische Kristallographie, Bern, Switzerland Search for other works by this author on: GSW Google Scholar Thomas Armbruster Thomas Armbruster Search for other works by this author on: GSW Google Scholar American Mineralogist (1998) 83 (1-2): 119–125. https://doi.org/10.2138/am-1998-1-211 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Daniel Nyfeler, Thomas Armbruster; Silanol groups in minerals and inorganic compounds. American Mineralogist 1998;; 83 (1-2): 119–125. doi: https://doi.org/10.2138/am-1998-1-211 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract The Inorganic Crystal Structure Database (ICSD) was searched for Si-OH groups with ordered H positions leading to 31 structures with 46 Si-OH groups. The geometrical characteristics of these partly hydroxylated SiO 4 tetrahedra were analyzed. Depending on the condensation of the tetrahedra, the protonization of one tetrahedral apex allows variations in Si-O bond lengths and distorts the tetrahedron. The Si-OH distance decreases with the number of bridging O atoms (Si-O-Si) from average values of 1.668 Aa for orthosilicates to 1.604 Aa for tetrahedra with three bridging O atoms, whereas the Si-O distances of the non-hydroxylated Si-O bonds remain constant at 1.62 Aa. This behavior was modeled by differences in bond strength sums of the tetrahedral O atoms. In the orthosilicates, the non-hydroxylated tetrahedral apices tend to be underbonded and the O of the silanol group is overbonded to satisfy the charge requirements of Si (super 4+) . In contrast, an Si-OH bearing tetrahedron with three bridging O atoms is characterized by a more regular bond strength distribution consistent with minor bond length distortion. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.