| | 2 | Author
| Ralf Janda, Gert Heller | Requires cookie* | | | Title
| Investigations of Solid Polyborates and their Aqueous Solutions by Raman Spectroscopy  | | | | Abstract
| Raman spectra of solid H3B03, Na2[B405(0H)4] • 8 H20, K[B506(0H)4] • 2 H20 and Na[B(OH)4] were recorded between 300 and 1500 cm -1 as well as of borax in aqueous solutions as a function of concentration and pH. Because of better solubility in water, the Raman spectrum of ammonium tetraborate in aqueous solution was also recorded as a function of pH. For comparisons the Raman spectra of solid (NH4)2[B40s(0H)4] • 2 H20, /S-NH4[B506(0H)4] • 2 HsO, NH4[B506(0H)4] • 0,67 H20 and NH4[B506(0H)4] were con-sidered. In solution, all lines in the Raman spectra could be assigned and the degree of depolarization measured. The assigned Raman frequencies can be used for the identifica-tion of unknown B-0-lines and therefore of unknown borate or polyborate structures. | | | |
Reference
| Z. Naturforsch. 34b, 585—590 (1979); eingegangen am 27. November 1978/23. Januar 1979 | | | |
Published
| 1979 | | | |
Keywords
| Polyborates, Ammonium Borates, Sodium Borates, Raman Spectroscopy, Identification | | | |
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| default:Reihe_B/34/ZNB-1979-34b-0585.pdf | | | | Identifier
| ZNB-1979-34b-0585 | | | | Volume
| 34 | |
| 3 | Author
| Ralf Janda, Gert Heller | Requires cookie* | | | Title
| 1 B—NMR-spektroskopische Untersuchungen an wäßrigen Polyboratlösungen n B NMR Spectroscopic Studies on Aqueous Polyborate Solutions | | | | Abstract
| The U B nuclear magnetic resonance spectra of sodium, potassium and ammonium polyborates in aqueous solutions, -as a function of concentration and pH -, provide information of the hydrolysis equilibria. Two n B NMR lines are observed in aqueous solutions of Na[B506(0H)4], K[B506(0H)4] and NH4[B506(0H)4]. Only one n B NMR line is recorded in aqueous solutions of (NH4)2[B4Os(OH)4] and Na2[B4Os(OH)4]. The results of the U B NMR spectra are discussed and compared with the results obtained from Raman studies of aqueous polyborate solutions. | | | |
Reference
| Z. Naturforsch. 34b, 1078—1083 (1979); eingegangen am 13. März/27. April 1979 | | | |
Published
| 1979 | | | |
Keywords
| n B NMR, Borates, Polyborates, Hydrolysis, Equilibria | | | |
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| default:Reihe_B/34/ZNB-1979-34b-1078.pdf | | | | Identifier
| ZNB-1979-34b-1078 | | | | Volume
| 34 | |
| 4 | Author
| Ulrich Timper, Gert Heller, M. Ahm Ood, Shakibaie-M Oghadam | Requires cookie* | | | Title
| Sborgit und /?-Sborgit -eine zweite synthetische Modifikation von Na[B50 6(0 H )4] * 3 H 20 Sborgit and /?-Sborgit -a Second Synthetic M odification of Na[B50 6(0 H )4] * 3 H 20 | | | | Abstract
| In crystallization experiments for silver borate hydrates from solutions o f borax, boric acid, and silver nitrate, a mixture o f sborgite and a second m odification -named by us "/?-sborgite" -have been found besides excess H 3B 0 3 and a microcrystalline silver borate. Both m odifica tions contain the same distorted pentaborate ion [B50 6(0 H)4]~. Both N a + ions in the asym metric unit are in special positions along the binary axis; one, N a (l), is octahedrally coordinat ed by four H20 molecules and two OH groups, the other one, N a(2), is tetrahedrally coordi nated by two H 20 molecules, two OH groups and -at longer distances -with two bridging oxygen atom s o f the pentaborate unit. The different angles -only a small rotation on the b-axis -o f the pentaborate anions between an identical matrix o f N a-cations give rise to the two different modifications. | | | |
Reference
| Z. Naturforsch. 45b, 1155—1166 (1990); eingegangen am 7. Juni 1989/25. Januar 1990 | | | |
Published
| 1990 | | | |
Keywords
| Sborgite, Polyborates, Sodium Pentaborate, M odification | | | |
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| default:Reihe_B/45/ZNB-1990-45b-1155.pdf | | | | Identifier
| ZNB-1990-45b-1155 | | | | Volume
| 45 | |
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