| Автор | Kupče, Ēriks |
| Автор | Liepinš, Edvards |
| Автор | Lukevics, Edmunds |
| Автор | Astapov, Boris |
| Дата выпуска | 1987 |
| dc.description | The effects of ring size on <sup>15</sup>N, <sup>17</sup>O, and <sup>29</sup>Si n.m.r. chemical shifts and <sup>15</sup>Nâ <sup>29</sup>Si, <sup>13</sup>Câ <sup>29</sup>Si, <sup>15</sup>Nâ <sup>1</sup>H, and <sup>29</sup>Siâ <sup>29</sup>Si coupling constants in cyclosilazoxanes have been studied. The opposite shielding sequence in δ(<sup>15</sup>N) and δ(<sup>29</sup>Si) and the decrease in <sup>15</sup>Nâ <sup>29</sup>Si coupling with diminishing ring size are consistent with higher Siâ N bond ionicity (reduced d Ï â p Ï interaction) in smaller rings. The <sup>17</sup>O chemical shift is practically independent of ring size in cyclosiloxanes. It has been proposed that the factors governing the <sup>17</sup>O chemical shift act in opposite directions and are balanced. A linear relationship between Nâ H bond stretching frequency and <sup>15</sup>N n.m.r. parameters (<sup>15</sup>Nâ <sup>1</sup>H coupling and <sup>15</sup>N chemical shifts) has been established. |
| Формат | application.pdf |
| Издатель | Royal Society of Chemistry |
| Название | Nitrogen-15 and oxygen-17 nuclear magnetic resonance chemical shifts and15N-29Si,13C-29Si, and15N–1H coupling constants in cyclosilazoxanes |
| Тип | research-article |
| DOI | 10.1039/DT9870001593 |
| Electronic ISSN | 1364-5447 |
| Print ISSN | 1472-7773 |
| Журнал | Journal of the Chemical Society, Dalton Transactions |
| Первая страница | 1593 |
| Последняя страница | 1596 |
| Выпуск | 7 |
