AN INFRARED AND 1H MAS NMR INVESTIGATION OF STRONG HYDROGEN BONDING IN USSINGITE, NA2ALSI3O8 (OH)
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dc.contributor.author | Johnson E.A. | |
dc.contributor.author | Rossman G.R. | |
dc.date.accessioned | 2022-11-07T07:47:45Z | |
dc.date.available | 2022-11-07T07:47:45Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13873516 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2004, 31, 2, 115-121 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39566 | |
dc.description.abstract | The mineral ussingite, Na_2AlSi_3O_8(OH), an “interrupted” tectosilicate, has strong hydrogen bonding between OH and the other nonbridging oxygen atom in the structure. Infrared spectra contain a strongly polarized, very broad OH-stretching band with an ill-defined maximum between 1500 and 1800 cm^(−1), and a possible OH librational bending mode at 1295 cm^(−1). The IR spectra confirm the orientation of the OH vector within the triclinic unit cell as determined from X-ray refinement (Rossi et al. 1974). There are three distinct bands in the ^1H NMR spectrum of ussingite: a predominant band at 13.5 ppm (TMS) representing 90% of the structural hydrogen, a second band at 15.9 ppm corresponding to 8% of the protons, and a third band at 11.0 ppm accounting for the remaining 2% of structural hydrogen. From the correlation between hydrogen bond length and ^1H NMR chemical shift (Sternberg and Brunner 1994), the predominant hydrogen bond length (H...O) was calculated to be 1.49 Å, in comparison to the hydrogen bond length determined from X-ray refinement (1.54 Å). The population of protons at 15.9 ppm is consistent with 5–8% Al–Si disorder. Although the ussingite crystal structure and composition are similar to those of low albite, the bonding environment of OH in low albite and other feldspars, as characterized through IR and ^1H NMR, is fundamentally different from the strong hydrogen bonding found in ussingite. | |
dc.subject | Infrared spectroscopy | |
dc.subject | NMR spectroscopy | |
dc.subject | Ussingite | |
dc.subject | Low albite | |
dc.subject | Hydrogen | |
dc.title | AN INFRARED AND 1H MAS NMR INVESTIGATION OF STRONG HYDROGEN BONDING IN USSINGITE, NA2ALSI3O8 (OH) | |
dc.type | Статья |
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